Best Ext. Sheathing: Rigid Foam An Option?
One more thing - I saw where AtlanticWB said "Actually, the Tyvek (or any brand of 'house wrap') goes on first, then the foam insulation on top of that." Is this true for all cases? He was writing about a particular situation where someone had a bunch of layers of existing material to deal with. But I thought it was the opposite for new construction.
Actually, my question has more parts than that. We are using 8 1/4 smooth Hardiplank lap siding on a new addition. In this case:
- What is the right order: Sheathing (foam), wrap, siding, correct?
- If I put up foam board insulation for the sheating, and tape the seams as instructed, do I even need Tyvek or another kind of house wrap?
- Is Tyvek the best option? I've read posts on the Contractor forum where people say tar felt is better for under fibrecement siding.
- Finally, should I use furring strips on top of the foam board (or OSB if I changed course) to create an 1/2" air barrier between the sheathing and the siding? This is a technique some people advocate, nailing the siding through the furring strips into the studs.
As you can tell, I am bit confused with what's the best practice here. Any advice would be appreciated.