correct order to finish basement

Old 03-08-12, 03:06 PM
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correct order to finish basement

I will use poly + foam + plywood + engineered laminate/wood floor to do basement floor. And I will use foam + wood frame + fibreglass + drywall to do the basement wall.

I plan to follow this order to install them:

1. put poly on the floor and all the way up 1 foot on the wall, seal every where when possible to make it as air tight as possible;
2. put wall foam (2" XPS) and glue them on the concrete wall, seal every where;
3. put floor foam (1" XPS) and seal every where;

now we have an envelop of rigid foam.

4. start wall frame, nail down with concrete and nail up with joists;
5. put plywood, just floating on top of the foam;
6. wiring and plumbing;
7. put fibreglass;
8. put drywall;
9. put engineered laminate/wood floor;

Some experts suggested put plywood before framing. So the frame is on top of the plywood.

What's your suggestion about my installation sequence?
Old 03-08-12, 03:19 PM
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Fiberglass insulation not needed with xps foam.

I prefer to have the wall anchored to the floor , and any wood touching concrte should be pressure treated.

If the subfloor plywood is not anchored to the floor somehow, there is nothing to prevent it from warping.

I assume you have filed your drawings for a permits??? Especially plumbing and electrical.
Old 03-08-12, 07:14 PM
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No poly on floor unless you want mold
Old 03-09-12, 01:03 AM
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You might want to consider putting your studs in first and then having a spray foam insulation company come out and spray in the insulation in the stud bays. You want them to use a closed cell foam so be sure you mention that if you decide to do that. It is more expensive but really worth it as the R value is much higher and you will save a bit more money on your heating and air conditioning bill. It helps to seal out any leaks from cracks and the closed cell will not allow mold to grow.

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