New basement insulation advice

jarvinenNovember 23, 2010

I'm currently in the planning stages of starting to work on my unfinished basement. We live in a cold climate (Michigan's Upper Peninsula) and my first step is to insulate and frame.

Our home was built in 2006 and has 9' poured walls in the basement. We live on top of a bluff and have a lot of sand below us so we have excellent drainage and a dry basement.

My plan was to paint the walls (and floors?) with Dry-Lok, put 2" foam board up next, then frame the walls and roll insulation between the studs. Is the Dry-Lok overkill since I'll be putting up foam? Any other advice for beginning this project?

I was also planning on putting in a subfloor of 2x4 sleepers with foam insulation between and a plywood surface.

Thanks for any advice.

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worthy

Overkill on the foundation coating.

For the floor, forget the 2x4 sleepers. ( I didn't realize anybody still used that method.) Install ply over the foam. Or use another floating floor system.

Pay attention to the areas above the foundation. Use caulking and/or polyurethane foam at the sill, then tightly-fitted XPS between the joists. Or just have the whole area sprayed with closed-cell polyurethane foam.

You might want to use lightweight metal framing instead of wood. Much less mess and no screw pops.

Here is a link that might be useful: Basement Insulation Systems

    Bookmark   November 23, 2010 at 11:11PM
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jarvinen

Any downside to using the foundation coating other than the extra cost and labor?

    Bookmark   November 24, 2010 at 9:10AM
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worthy

That is the downside. Plus, if serious leakage problems develop, the way to reduce them is from the exterior.

    Bookmark   November 24, 2010 at 11:23AM
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