Air Barrier Vapor Permeable

3m air barrier with permeable backing 3015vp is a self adhered vapor permeable wind and water resistant membrane with an aggressive acrylic adhesive and a breathable film.

Air barrier vapor permeable.

Perm a barrier npl membrane protects above grade wall assemblies against the damaging effects of air and liquid water ingress on building. Henry blueskin sa and sa lt non permeable air barrier membranes have been used to protect structures for more than 20 years serving as air barriers vapor barriers and rain barriers. They dramatically improve building energy efficiency indoor comfort and longevity. If it s really low it is a vapor barrier.

This reverse wound roll allows for longer roll lengths increasing contractor productivity. If the perm rating is greater than 10 it. Air shield lmp is also a single component liquid applied vapor permeable air liquid moisture barrier. Selecting the right air barrier for your project our knowledgeable technical sales representatives provide guidance of fluid applied sheet and vapor permeable systems a systematic approach appropriate for an area s climatic conditions and development of details and specifications to address tie ins or transitions.

Vapor barriers are also a cold climate artifact that have diffused into other climates more from ignorance than need. Greater than 10 perms. I will agree that it is possible to install 6 mil polyethylene as an air barrier. They have been tested to resist air leakage astm e 2178 and astm 2357 have low vapor permeance less than 0 1 perms and are watertight.

If the perm rating is low enough the material is a vapor retarder. Perm a barrier npl air and vapor barrier is a fluid applied one component membrane that cures to form a resilient monolithic fully bonded elastomeric sheet when applied to construction surfaces. Air barriers are essential for a high performing building envelope. The history of cold climate vapor barriers itself is a story based more on personalities than physics.

An excellent discussion about the differences between vapor barriers and air barriers can be found in quirrouette 1985. Gcp applied technologies gcp perm a barrier vps vapor permeable sheet membrane is a vapor permeable air and water barrier membrane consisting of a proprietary breathable carrier film with a specially designed adhesive. 10 perms or less and greater than 1 0 perm. Ccw provides three types of air barriers.

Air shield lmp stops the movement of air while at the same time allowing the passage of vapor. Although 6 mil polyethylene is an excellent vapor barrier it is often a very poor air barrier. Primer is not required on most construction surfaces.