Quote:
Originally Posted by beachouse
I am going to install 2x6 floor joists on a cement floor , put fiberglass insulation rolled in between the joists and the floor will be 3/4" exterior plywood.
The cement floor is approximately 2 feet above the ground and 3" thick.
Do I need to put tar paper or something on the cement before the floor joists go down ?
I have read that the cement will corrode the wood , but sill plates sit on cement blocks in a house though ?
Thanks
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Why are you doing this? I can answer your question but it's not up to me or you or anyone here. It's up to the Building Inspector unless you are in some very far out of the way unincorporated town with no rules.
Yes you are right that sill plates sit on cement. But they are pressure treated or the old term is wolmanized. This is regular Douglas Fir that is treated with Arsenic which is how you get that green color to it. All codes require wood that comes in contact with cement or block to be pressure treated. Concrete sweats and otherwise naturally gives off moisture which will rot untreated lumber.
In addition if standard wood is in contact with cement it will stay moist which will hold up a big sign for Termites to come make their home. A Termite can not eat into PT lumber.
What is this cement floor anyway? Is it an old slab?