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rjwassink6792

house wrap and rigid board

rjwassink67
5 years ago
last modified: 5 years ago

We would like to start building our own house in about 5 years. We are on the edge of zone 5a and 6. Our interior insulation will be mineral wool r23, then 1/2 plywood sheathing. Here is where the debut comes in. I would like to put 3/4 rigid board insulation on the outside to help with thermal bridging and to help as an air barrier. Questions on house wrap.
1. If we put it on under the rigid board, it helps get any inside moister away from the sheathing, but you're letting the outside moister further in. If you put it on over the board your stopping the outside moister before it gets to the rigid board keeping it further away from any wood, but could inside moister get trapped between the sheathing and rigid board? Should you do 2 layers? It's relatively cheap right, about $300 to do a house? Why not do one over and one under the rigid board.
2. Last question, we are probably using vinyl siding (least maintenance). Use furring stripes to create an air gap or does vinyl siding have enough airflow to create a good drying situation?

Thank you everyone!
Ryan

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