Two coats of a good oil paint will provide a vapour barrier of less than 1 Perm as well. Plastic and aluminium sheets are well under 1 Perm. Now the application of that is very interesting. That's the technical stuff, but it is easy to remember that less than 1 Perm is a functioning vapour barrier. Type 2 : the common vapour barrier for ordinary conditions is defined as not allowing more than 60 ng/(P.s.m2) or 1 perm after ageing, of moisture passage. These are required where there is cladding on the house that doesn't breath well.
#Vapor barrier for walls code
But just what is a vapour barrier? And maybe you already have one without knowing it.Īccording to the building code there are two types of vapour retarders (commonly called vapour barriers): Type 1 : that have to really restrict the passage of moisture in a major way, defined as not allowing more than 15 ng/(P.s.m2) (metric) or 0.26 Perms (Imperial) of moisture passage. Yes you need a vapour barrier if you add insulation. Here, I want to give you some technical details which will help out Kyle directly. This is really a big topic and I refer you to many database entries that can help you to understand both Vapour Barriers and Air Barriers. Can we lay insulation in the attic without adding a vapour barrier? If not, what is the best way to do so without a major renovation?" The house is a 1-1/2 story building with sloped ceilings on the second floor to the outside walls. "We have a house, 80-90 years old, with no insulation in the attic. Kyle from Fort Erie, Ontario, has a vapour barrier question.
0 kommentar(er)
