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谈论 Membrane products

Thu, 17 Jul 2008 02:42:22 GMT

谈论 Membrane products

Thu, 17 Jul 2008 02:40:32 GMT

引用

Membrane products

防水透汽膜或许在国内还比较陌生，但在欧美，该产品的生产及应用已非常成熟。但要生产高品质的防水透汽膜一直以来为欧美巨头所垄断，要设计与研发防水透汽膜生产线技术含量极高，而且生产工艺极难掌握，同时该产品要通过CE机构为时半年多的各项严格的检测，方可在市场上销售，可以说又设置了一道技术壁垒。因此防水透汽膜的生产与销售多年来在同内无人问津。
宁波山泉建材有限公司，其母公司为宁波山泉玻纤有限公司，是国内最大的玻纤网布生产商及出口商，凭借母公司雄厚的资金实力与坚实的技术研发队伍，同时凭借公司总经理叶泉友超人的胆识，在2005年毅然决定研发与生产防水透汽膜。在过去的2年多时间，可以说困难重重，我们几度陷入困境，几度想放弃，但最终，凭借着山泉人坚韧不拔及永不服输的精神，在公司总经理叶泉友的带领下，攻克重重困难。终于在2007年底成功研发出防水透汽膜生产线，同时掌握了所有生产工艺，并根据CE检测要求，建议了完善的实验及测试中心。从此结束了只有欧美巨头才能生产高品质防水透汽膜的历史，成为国内第一个吃螃蟹的人。
2008年2月，宁波山泉建材第一批防水透汽膜共计10个柜漂洋过海；2008年4月，产品经历为时8个多月的检测，一次性通过CE权威检测机构的各项检测；2008年6月，宁波山泉建材有限公司参加了在上海举办的第六届中国国际屋面和建筑防水技术展览会，引起的广大专业人士极大的兴趣与观注；同时公司产品已报国家发明专利及2008年国家重点新产品计划项目。
回顾过去，是一条充满艰辛与困惑的路，展望未来，宁波山泉建材有限公司定能在广阔的国内、国际舞台上成为一颗崔灿的明星。

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谈论 Membrane products

Thu, 17 Jul 2008 02:35:03 GMT

引用

Membrane products

Membrane

Membrane products: laminated by one layer of modified polyolefin membrane and two layers of reinforced non woven.

Characteristics of membranes: breathable, water proof, water vapour permeable

Function of the membrane
A: The breathable membrane effectively prevent the construction from rain and wind.
B: The roofing membrane can strengthen the circulation of water vapour, reduce the humidity, improve the living environment.
C: the roofing foil effectively avoid the effect from the cold and hot air, had the thermal insulation property, effect can be heightened in case installed together with the other materials.
D: the membrane is Anti-ultraviolet:

Membrane Application
The membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane Technical data
Mass per unit area EN1849 g/m2 100g (?0%) 120g (?0%) Length
EN1848 m 50 50 Width EN1848 m 1.5(-0.5%,+1.5% 1.5(-0.5%,+1.5%
Reaction to fire EN13501-1:2002 EN11925-2

Links: breathable membrane, roofing membrane, roofing foil, membrane, 防水防水透汽膜防水材料保温材料墙体材料 fiberglass mesh, 律师, Links, valve

Membrane products

Thu, 05 Jun 2008 01:56:06 GMT

Membrane

Membrane products: laminated by one layer of modified polyolefin membrane and two layers of reinforced non woven.
Characteristics of membranes: breathable, water proof, water vapour permeable
Function of the membrane
A: The breathable membrane effectively prevent the construction from rain and wind.
B: The roofing membrane can strengthen the circulation of water vapour, reduce the humidity, improve the living environment.
C: the roofing foil effectively avoid the effect from the cold and hot air, had the thermal insulation property, effect can be heightened in case installed together with the other materials.
D: the membrane is Anti-ultraviolet:
Membrane Application
The membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.
Membrane Technical data
Mass per unit area EN1849 g/m2 100g (?0%) 120g (?0%) Length
EN1848 m 50 50 Width EN1848 m 1.5(-0.5%,+1.5% 1.5(-0.5%,+1.5%
Reaction to fire EN13501-1:2002 EN11925-2

谈论 How widely are they used and in what applications ?

Thu, 05 Jun 2008 01:47:45 GMT

引用

How widely are they used and in what applications ?

How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1
Table 1 – BBA Certificates issued for cold unventilated roof applications (at 15.03.04)
Certificate No. Product name Certificate holder
99/3648 Daltex Roofshield Don & Low Ltd Nonwovens
00/3749 Permo Forte Klober Ltd
01/3842 Global Breather Roof Tile
Underlay
EBC UK Ltd
03/4017 Breathline Vapour permeable
Underlay
Knauf Insulation Ltd
03/4062 Monarperm 700 Icopal Ltd
04/4078 - DS3 VapR-free underlay Mercury Building products Ltd
04/4101 Tyvek Universal Underlays DuPont de Nemours (Luxembourg) Sarl
Details of approved products can be found on www.bbacerts.co.uk or by phoning the BBA
hotline on 01923 665400. Users are advised to check the validity of Certificates and any
limitations on the scope of the approval.
Q3 Can they be used simply ‘instead’ of conventional eaves ventilation ?
A3 Only if a number of measures are taken to limit the ingress of water vapour into the
unventilated space. In this regard, the roof system must be considered as a whole from ceiling
to roof tiles, including the following design points:
- all penetrations into the roof space must be properly sealed
- loft hatches must incorporate effective compressible draught seals
- the rooms below the ceiling must include provision for the dispersal and rapid dilution of
water vapour in accordance with the Building Regulations, including extractor fans in
rooms that may experience high humidity
- All water tanks in the loft space must be covered
- Any vent pipes should be arranged so that they do not discharge water vapour into the loft
space
See also Q&A10 to 15 and the relevant BBA Certificate for conditions of approval.
Q4 What are the advantages of using the unventilated system ?
A4 One of the main advantages is reducing the amount of heat lost by air leakage through the
ceiling and from the loft space to the outside. Up to 25% of the heat lost through a
conventional roof system is by this mechanism. The unventilated roof ‘system’ will reduce
this mechanism of heat loss, more so if the underlay laps are sealed.
In addition, not having to provide eaves and ridge ventilation can help to save time and cost
on site and can give a more desirable appearance to the finished roof.
Q5 What are the disadvantages of using the system ?
A5 Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed
and that the loft space is protected from sources of water vapour, in accordance with the
requirements of the Certificate. See also A3.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the
opportunity for moisture ingress into the loft space and consequent risk of condensation
occurring is increased. This is also true of conventionally ventilated constructions where the
effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’
moisture laden warm air from the living space into the loft space. However it is recognised
that the rate of moisture removal via the ventilated and unventilated approach is not the same.
It is therefore important that the ceiling is sealed to an appropriate level. BBA computer
modelling of the behaviour of roofs has assumed effective ceiling ‘defect’ areas of up to 10
square mm per square metre of ceiling. See also Q/A 6, 7 and 11.
There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable
roof tile underlay membranes in certain wind conditions. The BBA has, however, only
received a very limited number of reports in this regard and therefore do not view it as a
fundamental problem.

Links: breathable membrane, roofing membrane, roofing foil membrane fiberglass mesh valve

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谈论 How widely are they used and in what applications ?

Thu, 05 Jun 2008 01:46:15 GMT

引用

How widely are they used and in what applications ?

How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1
Table 1 – BBA Certificates issued for cold unventilated roof applications (at 15.03.04)
Certificate No. Product name Certificate holder
99/3648 Daltex Roofshield Don & Low Ltd Nonwovens
00/3749 Permo Forte Klober Ltd
01/3842 Global Breather Roof Tile
Underlay
EBC UK Ltd
03/4017 Breathline Vapour permeable
Underlay
Knauf Insulation Ltd
03/4062 Monarperm 700 Icopal Ltd
04/4078 - DS3 VapR-free underlay Mercury Building products Ltd
04/4101 Tyvek Universal Underlays DuPont de Nemours (Luxembourg) Sarl
Details of approved products can be found on www.bbacerts.co.uk or by phoning the BBA
hotline on 01923 665400. Users are advised to check the validity of Certificates and any
limitations on the scope of the approval.
Q3 Can they be used simply ‘instead’ of conventional eaves ventilation ?
A3 Only if a number of measures are taken to limit the ingress of water vapour into the
unventilated space. In this regard, the roof system must be considered as a whole from ceiling
to roof tiles, including the following design points:
- all penetrations into the roof space must be properly sealed
- loft hatches must incorporate effective compressible draught seals
- the rooms below the ceiling must include provision for the dispersal and rapid dilution of
water vapour in accordance with the Building Regulations, including extractor fans in
rooms that may experience high humidity
- All water tanks in the loft space must be covered
- Any vent pipes should be arranged so that they do not discharge water vapour into the loft
space
See also Q&A10 to 15 and the relevant BBA Certificate for conditions of approval.
Q4 What are the advantages of using the unventilated system ?
A4 One of the main advantages is reducing the amount of heat lost by air leakage through the
ceiling and from the loft space to the outside. Up to 25% of the heat lost through a
conventional roof system is by this mechanism. The unventilated roof ‘system’ will reduce
this mechanism of heat loss, more so if the underlay laps are sealed.
In addition, not having to provide eaves and ridge ventilation can help to save time and cost
on site and can give a more desirable appearance to the finished roof.
Q5 What are the disadvantages of using the system ?
A5 Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed
and that the loft space is protected from sources of water vapour, in accordance with the
requirements of the Certificate. See also A3.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the
opportunity for moisture ingress into the loft space and consequent risk of condensation
occurring is increased. This is also true of conventionally ventilated constructions where the
effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’
moisture laden warm air from the living space into the loft space. However it is recognised
that the rate of moisture removal via the ventilated and unventilated approach is not the same.
It is therefore important that the ceiling is sealed to an appropriate level. BBA computer
modelling of the behaviour of roofs has assumed effective ceiling ‘defect’ areas of up to 10
square mm per square metre of ceiling. See also Q/A 6, 7 and 11.
There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable
roof tile underlay membranes in certain wind conditions. The BBA has, however, only
received a very limited number of reports in this regard and therefore do not view it as a
fundamental problem.

Links: breathable membrane, roofing membrane, roofing foil membrane fiberglass mesh valve

Awarenessnetworks GlassBuy IeTrade   P1   P2   P3 Lead LiveSpace Blonder Meebq Maverick Bruce
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谈论 How widely are they used and in what applications ?

Thu, 05 Jun 2008 01:45:12 GMT

引用

How widely are they used and in what applications ?

How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1
Table 1 – BBA Certificates issued for cold unventilated roof applications (at 15.03.04)
Certificate No. Product name Certificate holder
99/3648 Daltex Roofshield Don & Low Ltd Nonwovens
00/3749 Permo Forte Klober Ltd
01/3842 Global Breather Roof Tile
Underlay
EBC UK Ltd
03/4017 Breathline Vapour permeable
Underlay
Knauf Insulation Ltd
03/4062 Monarperm 700 Icopal Ltd
04/4078 - DS3 VapR-free underlay Mercury Building products Ltd
04/4101 Tyvek Universal Underlays DuPont de Nemours (Luxembourg) Sarl
Details of approved products can be found on www.bbacerts.co.uk or by phoning the BBA
hotline on 01923 665400. Users are advised to check the validity of Certificates and any
limitations on the scope of the approval.
Q3 Can they be used simply ‘instead’ of conventional eaves ventilation ?
A3 Only if a number of measures are taken to limit the ingress of water vapour into the
unventilated space. In this regard, the roof system must be considered as a whole from ceiling
to roof tiles, including the following design points:
- all penetrations into the roof space must be properly sealed
- loft hatches must incorporate effective compressible draught seals
- the rooms below the ceiling must include provision for the dispersal and rapid dilution of
water vapour in accordance with the Building Regulations, including extractor fans in
rooms that may experience high humidity
- All water tanks in the loft space must be covered
- Any vent pipes should be arranged so that they do not discharge water vapour into the loft
space
See also Q&A10 to 15 and the relevant BBA Certificate for conditions of approval.
Q4 What are the advantages of using the unventilated system ?
A4 One of the main advantages is reducing the amount of heat lost by air leakage through the
ceiling and from the loft space to the outside. Up to 25% of the heat lost through a
conventional roof system is by this mechanism. The unventilated roof ‘system’ will reduce
this mechanism of heat loss, more so if the underlay laps are sealed.
In addition, not having to provide eaves and ridge ventilation can help to save time and cost
on site and can give a more desirable appearance to the finished roof.
Q5 What are the disadvantages of using the system ?
A5 Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed
and that the loft space is protected from sources of water vapour, in accordance with the
requirements of the Certificate. See also A3.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the
opportunity for moisture ingress into the loft space and consequent risk of condensation
occurring is increased. This is also true of conventionally ventilated constructions where the
effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’
moisture laden warm air from the living space into the loft space. However it is recognised
that the rate of moisture removal via the ventilated and unventilated approach is not the same.
It is therefore important that the ceiling is sealed to an appropriate level. BBA computer
modelling of the behaviour of roofs has assumed effective ceiling ‘defect’ areas of up to 10
square mm per square metre of ceiling. See also Q/A 6, 7 and 11.
There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable
roof tile underlay membranes in certain wind conditions. The BBA has, however, only
received a very limited number of reports in this regard and therefore do not view it as a
fundamental problem.

Links: breathable membrane , roofing membrane , roofing foil membrane fiberglass mesh valve

Awarenessnetworks GlassBuy IeTrade   P1   P2   P3 Lead LiveSpace Blonder Meebq Maverick Bruce
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谈论 How widely are they used and in what applications ?

Thu, 05 Jun 2008 01:43:37 GMT

引用

How widely are they used and in what applications ?

How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1
Table 1 – BBA Certificates issued for cold unventilated roof applications (at 15.03.04)
Certificate No. Product name Certificate holder
99/3648 Daltex Roofshield Don & Low Ltd Nonwovens
00/3749 Permo Forte Klober Ltd
01/3842 Global Breather Roof Tile
Underlay
EBC UK Ltd
03/4017 Breathline Vapour permeable
Underlay
Knauf Insulation Ltd
03/4062 Monarperm 700 Icopal Ltd
04/4078 - DS3 VapR-free underlay Mercury Building products Ltd
04/4101 Tyvek Universal Underlays DuPont de Nemours (Luxembourg) Sarl
Details of approved products can be found on www.bbacerts.co.uk or by phoning the BBA
hotline on 01923 665400. Users are advised to check the validity of Certificates and any
limitations on the scope of the approval.
Q3 Can they be used simply ‘instead’ of conventional eaves ventilation ?
A3 Only if a number of measures are taken to limit the ingress of water vapour into the
unventilated space. In this regard, the roof system must be considered as a whole from ceiling
to roof tiles, including the following design points:
- all penetrations into the roof space must be properly sealed
- loft hatches must incorporate effective compressible draught seals
- the rooms below the ceiling must include provision for the dispersal and rapid dilution of
water vapour in accordance with the Building Regulations, including extractor fans in
rooms that may experience high humidity
- All water tanks in the loft space must be covered
- Any vent pipes should be arranged so that they do not discharge water vapour into the loft
space
See also Q&A10 to 15 and the relevant BBA Certificate for conditions of approval.
Q4 What are the advantages of using the unventilated system ?
A4 One of the main advantages is reducing the amount of heat lost by air leakage through the
ceiling and from the loft space to the outside. Up to 25% of the heat lost through a
conventional roof system is by this mechanism. The unventilated roof ‘system’ will reduce
this mechanism of heat loss, more so if the underlay laps are sealed.
In addition, not having to provide eaves and ridge ventilation can help to save time and cost
on site and can give a more desirable appearance to the finished roof.
Q5 What are the disadvantages of using the system ?
A5 Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed
and that the loft space is protected from sources of water vapour, in accordance with the
requirements of the Certificate. See also A3.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the
opportunity for moisture ingress into the loft space and consequent risk of condensation
occurring is increased. This is also true of conventionally ventilated constructions where the
effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’
moisture laden warm air from the living space into the loft space. However it is recognised
that the rate of moisture removal via the ventilated and unventilated approach is not the same.
It is therefore important that the ceiling is sealed to an appropriate level. BBA computer
modelling of the behaviour of roofs has assumed effective ceiling ‘defect’ areas of up to 10
square mm per square metre of ceiling. See also Q/A 6, 7 and 11.
There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable
roof tile underlay membranes in certain wind conditions. The BBA has, however, only
received a very limited number of reports in this regard and therefore do not view it as a
fundamental problem.

Links: breathable membrane, roofing membrane, roofing foil membrane fiberglass mesh valve

Awarenessnetworks GlassBuy IeTrade   P1   P2   P3 Lead LiveSpace Blonder Meebq Maverick Bruce
Zegna Nings Cilo  385857762 SoulCast SpotsDir DreamHome EcTrade MySpace Exportnation
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谈论 How widely are they used and in what applications ?

Thu, 05 Jun 2008 01:40:10 GMT

引用

How widely are they used and in what applications ?

How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1
Table 1 – BBA Certificates issued for cold unventilated roof applications (at 15.03.04)
Certificate No. Product name Certificate holder
99/3648 Daltex Roofshield Don & Low Ltd Nonwovens
00/3749 Permo Forte Klober Ltd
01/3842 Global Breather Roof Tile
Underlay
EBC UK Ltd
03/4017 Breathline Vapour permeable
Underlay
Knauf Insulation Ltd
03/4062 Monarperm 700 Icopal Ltd
04/4078 - DS3 VapR-free underlay Mercury Building products Ltd
04/4101 Tyvek Universal Underlays DuPont de Nemours (Luxembourg) Sarl
Details of approved products can be found on www.bbacerts.co.uk or by phoning the BBA
hotline on 01923 665400. Users are advised to check the validity of Certificates and any
limitations on the scope of the approval.
Q3 Can they be used simply ‘instead’ of conventional eaves ventilation ?
A3 Only if a number of measures are taken to limit the ingress of water vapour into the
unventilated space. In this regard, the roof system must be considered as a whole from ceiling
to roof tiles, including the following design points:
- all penetrations into the roof space must be properly sealed
- loft hatches must incorporate effective compressible draught seals
- the rooms below the ceiling must include provision for the dispersal and rapid dilution of
water vapour in accordance with the Building Regulations, including extractor fans in
rooms that may experience high humidity
- All water tanks in the loft space must be covered
- Any vent pipes should be arranged so that they do not discharge water vapour into the loft
space
See also Q&A10 to 15 and the relevant BBA Certificate for conditions of approval.
Q4 What are the advantages of using the unventilated system ?
A4 One of the main advantages is reducing the amount of heat lost by air leakage through the
ceiling and from the loft space to the outside. Up to 25% of the heat lost through a
conventional roof system is by this mechanism. The unventilated roof ‘system’ will reduce
this mechanism of heat loss, more so if the underlay laps are sealed.
In addition, not having to provide eaves and ridge ventilation can help to save time and cost
on site and can give a more desirable appearance to the finished roof.
Q5 What are the disadvantages of using the system ?
A5 Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed
and that the loft space is protected from sources of water vapour, in accordance with the
requirements of the Certificate. See also A3.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the
opportunity for moisture ingress into the loft space and consequent risk of condensation
occurring is increased. This is also true of conventionally ventilated constructions where the
effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’
moisture laden warm air from the living space into the loft space. However it is recognised
that the rate of moisture removal via the ventilated and unventilated approach is not the same.
It is therefore important that the ceiling is sealed to an appropriate level. BBA computer
modelling of the behaviour of roofs has assumed effective ceiling ‘defect’ areas of up to 10
square mm per square metre of ceiling. See also Q/A 6, 7 and 11.
There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable
roof tile underlay membranes in certain wind conditions. The BBA has, however, only
received a very limited number of reports in this regard and therefore do not view it as a
fundamental problem.

Links: breathable membrane, roofing membrane, roofing foil, membrane fiberglass mesh valve

Awarenessnetworks GlassBuy IeTrade   P1   P2   P3 Lead LiveSpace Blonder Meebq Maverick Bruce
Zegna Nings Cilo  385857762 SoulCast SpotsDir DreamHome EcTrade MySpace Exportnation
PerfectCondoz Myekoo Efreedir Fukesi CleverDir blogtext Ca-Yahoo Uk-Yahoo   Uk-Yahoo-Po Au-Yahoo

How widely are they used and in what applications ?

Wed, 07 May 2008 06:14:51 GMT

How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1
Table 1 – BBA Certificates issued for cold unventilated roof applications (at 15.03.04)
Certificate No. Product name Certificate holder
99/3648 Daltex Roofshield Don & Low Ltd Nonwovens
00/3749 Permo Forte Klober Ltd
01/3842 Global Breather Roof Tile
Underlay
EBC UK Ltd
03/4017 Breathline Vapour permeable
Underlay
Knauf Insulation Ltd
03/4062 Monarperm 700 Icopal Ltd
04/4078 - DS3 VapR-free underlay Mercury Building products Ltd
04/4101 Tyvek Universal Underlays DuPont de Nemours (Luxembourg) Sarl
Details of approved products can be found on www.bbacerts.co.uk or by phoning the BBA
hotline on 01923 665400. Users are advised to check the validity of Certificates and any
limitations on the scope of the approval.
Q3 Can they be used simply ‘instead’ of conventional eaves ventilation ?
A3 Only if a number of measures are taken to limit the ingress of water vapour into the
unventilated space. In this regard, the roof system must be considered as a whole from ceiling
to roof tiles, including the following design points:
- all penetrations into the roof space must be properly sealed
- loft hatches must incorporate effective compressible draught seals
- the rooms below the ceiling must include provision for the dispersal and rapid dilution of
water vapour in accordance with the Building Regulations, including extractor fans in
rooms that may experience high humidity
- All water tanks in the loft space must be covered
- Any vent pipes should be arranged so that they do not discharge water vapour into the loft
space
See also Q&A10 to 15 and the relevant BBA Certificate for conditions of approval.
Q4 What are the advantages of using the unventilated system ?
A4 One of the main advantages is reducing the amount of heat lost by air leakage through the
ceiling and from the loft space to the outside. Up to 25% of the heat lost through a
conventional roof system is by this mechanism. The unventilated roof ‘system’ will reduce
this mechanism of heat loss, more so if the underlay laps are sealed.
In addition, not having to provide eaves and ridge ventilation can help to save time and cost
on site and can give a more desirable appearance to the finished roof.
Q5 What are the disadvantages of using the system ?
A5 Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed
and that the loft space is protected from sources of water vapour, in accordance with the
requirements of the Certificate. See also A3.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the
opportunity for moisture ingress into the loft space and consequent risk of condensation
occurring is increased. This is also true of conventionally ventilated constructions where the
effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’
moisture laden warm air from the living space into the loft space. However it is recognised
that the rate of moisture removal via the ventilated and unventilated approach is not the same.
It is therefore important that the ceiling is sealed to an appropriate level. BBA computer
modelling of the behaviour of roofs has assumed effective ceiling ‘defect’ areas of up to 10
square mm per square metre of ceiling. See also Q/A 6, 7 and 11.
There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable
roof tile underlay membranes in certain wind conditions. The BBA has, however, only
received a very limited number of reports in this regard and therefore do not view it as a
fundamental problem.

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What is a breather membrane and how does it work ?

Wed, 07 May 2008 06:11:50 GMT

A1 The particular membranes in question typically comprise spunbonded polypropylene or
spunbonded polypropylene/polyethylene laminated either side of a micro-porous
polypropylene or polyethylene film.
Monolithic spunbonded membranes are also used. They have a structure that is sufficiently
fine to prevent liquid water penetration in service conditions, but not too fine to prevent the
transfer of water vapour (molecules of water in air), see figure 1.
All materials, including vapour control layers, have a finite permeability to water vapour
transfer. However, in the context of this Article, a breathable membrane is a material which, in
service conditions, is sufficiently permeable to water vapour transfer to adequately limit the
risk of condensation in roofs.
Current published definitions include the following:
BS 5250: 2002 section 3.2 “Breather membrane” – vapour permeable membrane with a
vapour resistance less than 0.6 MNs/g. The Standard goes on to describe the use of ‘Breather
membranes’ in walls.
BS 5250: 2002 section 3.26 “Vapour permeable underlay” – Pitched roof underlay which
meets the recommendations of BS 5534-1 and NFRC TB6 and is additionally water vapour
permeable with a vapour resistance of less than 0.25 MNs/g
These two figures can also be expressed as water vapour transmission rates of at least 341 or
820 g/m2/day respectively, when tested under standard conditions of 25o C and humidity of 0%
rh and 75% rh on each side of the membrane.
Figure 1 – Breather membrane
The function of these membranes is to provide all of the normal demands made on a roof
underlay and at the same time allow water vapour egress without making specific provision
for ventilation. See also Q/A3.
Q2 How widely are they used and in what applications ?
A2 Breather membranes have been used abroad in construction since the 1970’s.
Membranes were first Certified by the BBA in 1982 as sheathing membranes for timber frame
walls and as roof tile underlays in conventionally ventilated cold roofs. They were
subsequently approved as roof tile underlays in warm roof constructions in 1982 and most
recently in cold non ventilated roof constructions in 1999. At the time of writing this article,
Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in
dwellings have been issued as shown in Table 1

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Helen的共享空间

谈论 Membrane products

谈论 Membrane products

谈论 Membrane products

Membrane

Membrane products: laminated by one layer of modified polyolefin membrane and two layers of reinforced non woven.

Characteristics of membranes: breathable, water proof, water vapour permeable

Membrane Application
The membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane products

Membrane

Membrane products: laminated by one layer of modified polyolefin membrane and two layers of reinforced non woven.

Characteristics of membranes: breathable, water proof, water vapour permeable

Membrane Application
The membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane Technical data
Mass per unit area EN1849 g/m2 100g (?0%) 120g (?0%) Length
EN1848 m 50 50 Width EN1848 m 1.5(-0.5%,+1.5% 1.5(-0.5%,+1.5%
Reaction to fire EN13501-1:2002 EN11925-2

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

How widely are they used and in what applications ?

What is a breather membrane and how does it work ?

Helen的共享空间

谈论 Membrane products

谈论 Membrane products

谈论 Membrane products

Membrane

Membrane products: laminated by one layer of modified polyolefin membrane and two layers of reinforced non woven.

Characteristics of membranes: breathable, water proof, water vapour permeable

Membrane ApplicationThe membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane products

Membrane

Membrane products: laminated by one layer of modified polyolefin membrane and two layers of reinforced non woven.

Characteristics of membranes: breathable, water proof, water vapour permeable

Membrane ApplicationThe membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane Technical dataMass per unit area EN1849 g/m2 100g (?0%) 120g (?0%) LengthEN1848 m 50 50 Width EN1848 m 1.5(-0.5%,+1.5% 1.5(-0.5%,+1.5%Reaction to fire EN13501-1:2002 EN11925-2

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

谈论 How widely are they used and in what applications ?

How widely are they used and in what applications ?

What is a breather membrane and how does it work ?

Membrane Application
The membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane Application
The membrane has the extensive application in the field where requests water resistance and vapour permeable, e.g., construction, means of transport, etc., which is an ideal functional material.

Membrane Technical data
Mass per unit area EN1849 g/m2 100g (?0%) 120g (?0%) Length
EN1848 m 50 50 Width EN1848 m 1.5(-0.5%,+1.5% 1.5(-0.5%,+1.5%
Reaction to fire EN13501-1:2002 EN11925-2