So my fiance and I just bought a house. Some of you guys helped me figure out what kind of siding I have on the house and I believe it's Canexel siding from LP. Not great but it seems to be lasting. When I was digging to find a marking on the back of the siding on the house I saw there was no sheeting beneath the siding. There is only a layer of styrofoam and then the siding. I would say the styrofoam is 1 1/2" thick, might only be 1". My question is: is this normal/okay? If it is that's news to me. We were thinking of replacing the siding eventually with cement board lap siding maybe, or vinyl. If we did either, would we need to pull off the foam and put sheeting on? I'm kind of baffled by this...
Ummm...My house has no sheeting under the siding...
Zct6
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I can't offer any help or advice, but I will say be glad you have the foam between the studs and siding. A house that I rented a few years ago only had black felt paper between the studs and fiberboard siding. Maintenance came out to replace a couple of damaged pieces of siding and showed me what they found. And I was always wondering why there was a major draft coming thru the outlets on the exterior walls 
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