Vapor Barrier
CertainTeed MemBrain™...The Smart Vapour
Retarder for walls.
MemBrain
Protects ......but
also Breathes!
Product Use: To be used behind concrete board walls in a shower
area where moisture problems are a concern.
Benefit: Easy to install! Staple to wood studs or caulk to steel
studs. Overlap corners 4" - 6" and seam with vapour barrier tape.
View Step 5 off the Installation Video
MemBrain™ Smart Vapour Retarder is a polyamide
film that changes its permeability with the ambient humidity
condition. The product's permeance is 1 perm or less when tested in
accordance with ASTM E96, dry cup method, and increase to greater
than 10 perms using the wet cup
method. MemBrain™ allows closed building
envelope systems to increase their drying potential with seasonal
climate changes. With a high resistance to water
vapour in winter or low himidity, MemBrain™
behaves like a moisture vapour barrier such as 6-mil polyethylene
sheeting. With an increase in relative
humididty, MemBrain™'s permeability increases
dramatically, permitting drying to occur and decreasing moisture
accumulation within the construction and the potential moisture
damage.
This product can be used in place of traditional vapour
retarders with unfaced fibreglass insulation, loose fill, or spray
foam to provide an insulation system that is ideal in some of the
more severe climate condition areas in terms of both temperature
and humidity.
MemBrain™'s performance in rooms with short
peaks of high humidity, such as bathrooms and kitchens, will not be
affected because of the buffering action of interior finishes.
*Do not use low permeance interior finishes such as vinyl
wallpaper or vapour retarding paints
with MemBrain™. The drying benefits
of MemBrain™will diminish with the use of low
permeance finishes.
