Insulation, Radiant and Vapor Barriers - Should I add tyvek to house?
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Civicminded
11-23-07, 09:44 PM
I have a house built in 1978 that has vinyl siding over a black fiberboard sheathing (not sure of the name of it) with fiberglass batt insulation and a plastic sheet vapor barrier then drywall. I need to pull siding off of our house repair the flashing on a dormer, Depending on the damage to the sheathing I may replace it with polystyrene sheathing or osb. My question is this, should I put tyvek over the sheathing or will this trap moisture between the drywall vapor barrier and the sheathing? thanks!
d00bs
11-23-07, 11:55 PM
Im pretty sure that actual tyvek isnt a moisture barrier at all. Its just an air infiltration barrier.
Civicminded
11-24-07, 07:53 AM
Ok I went to tyveks website and they say its a gross water infiltration barrier, and a air infiltration barrier. It says its breatheble so I suppose it wouldn't hurt to use it over the black board sheathing or the polystyrene sheathing if I replace the blackboard.