Breathable membranes have been used in buildings for many years now and, more recently, in cold pitched roof constructions without traditional eaves ventilation. The benefit of reduced heat loss and not having to incorporate ventilators has seen their use grow but at the same time has attracted noticeable comment both from supporters of the application and from detractors who favour traditional ventilation solutions.In light of this, the BBA has prepared this short article to clarify our view as independent assessors of ‘fitness for purpose’ of products and their application. We have adopted a ‘Question and Answer’ approach to allow the easy identification of items of particular interest and/or concern to readers. The views expressed here are based only on the BBA’s experience in assessing breathable membranes in a number of applications over recent years. Products or applications which are outside the scope of published Agrement Certificates or national Codes of Practice have not been assessed by the BBA and are not addressed in this article.

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     How durable are the membrane system ?
 In normal conditions found in roofs, the membranes are durable and can be expected to have a life comparable to that of traditional roof tile underlays. Specifiers should however follow the requirements of the relevant Certificate relating to the period for which the underlay can be exposed to the elements before slating/tiling and on the use of eaves guards for open eaves constructions.
With regard to water vapour permeability, the BBA assessment included measurements of the effect of heat ageing, effect of UV light exposure and of accelerated dust/debris accumulation and found no discernible reduction in performance. Do I need a vapour check ceiling ?
 No but it can help. It is important to remember that vapour will pass through the path of least resistance in a ceiling. Gaps and cracks will provide an effective ‘short-circuit’ however high the vapour resistance of the rest of the ceiling is.  What do I do about sources of moisture in the loft space
 Water tanks should have lids on and vent pipes arranged to avoid venting moisture into the loft space. Do I need counter battens ?
 In general, counter battens are not required if the underlay is draped between rafters, ie a nominal 10 mm. If however it is not draped but pulled taut, counter battens are applied. Readers should refer to specific Certificates for the holder’s detailed installation instructions. Can you have unventilated loft spaces when timber sarking is used ?
 Yes, with the traditional Scottish practice of planks nominally 100 mm wide with a 2 mm gap either side. Their use with large OSB, chipboard or plywood timber panels, 2440 mm by 1220 mm, has not been approved by the BBA.

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Ningbo Shanquan Building Materials Co.,Ltd. was established in 2005. We occupy the area of 38.000 square meters, and own fixed assets of eight millions U.S. dollars. From the very beginning, we concentrate on the production of functional membrane products. The current production capacity is 35 million square meters per year, which will be enlarged greatly in the coming two years. At present, our main product is water proof water vapour permeable membrane, which is mainly used for roof construction and wall structure. Very soon, we will develop our production scope to other similar functional membrane materials, so that to satisfy the different requirements from the customers.

      Based on the horizontal integration with Zhejiang University, we have very strong  R & D Ability, depend on which, we had designed and developed the full set of equipment and the production techniques to produce 3 layers breathable membranes with our own technical know-how. At the same time, we have the advanced test equipments and strict quality control system, which ensure the stable high quality goods and the high production efficiency. Stable high quality is always our persistent pursuit, high production efficiency enables us to provide the competitive prices so as to be the winner on the market.

      We hope to provide our customers the higher quality products with the competitive prices, hope all the customers will gain good effect  from the co-operation with us.

      Our target is: hand in hand with customers achieve common development.

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Membrane

1. Name of the products: Breathable membrane, house membrane, roof membrane,Waterproof water-vapour permeable breathable membrane
   laminated by one layer of modified polyolefin membrane  and two layers of reinforced non woven.

2. Characteristics: breathable, water proof, water vapour permeable

3. Function of themembrane
   A: The membrane effectively prevent the construction from rain and wind.
   B: The membrane can strengthen the circulation of water vapour, reduce the humidity, improve the living environment.
   C: the membrane 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:

4. Application of the membrane
   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
   
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