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Old 03-28-2011, 09:33 AM   #1
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Sheets of foam below basement floor


I have loads of sand as a floor in my basement. I want to pour a 4 bag mix floor over 1 or 1 1/2 inch foam.
Should I?
1. Change the sand to gravel?
2. Place a 6 mill poly sheet down first or on the top of the foam?
3. What is exactly the name of the builders tape I should use to join the plastic poly together.?
4. Do I really need to put in a 6 inch wire mesh in the concrete?
5. How do I attach the plastic to the wall.?

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Last edited by mike2011; 03-28-2011 at 12:43 PM.
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Old 03-28-2011, 01:41 PM   #2
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Sheets of foam below basement floor


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Originally Posted by mike2011 View Post
I have loads of sand as a floor in my basement. I want to pour a 4 bag mix floor over 1 or 1 1/2 inch foam.
Should I?

I would recommend an insulation like "Foamular 250", which is intended for concrete weight and only costs a tad more than the 15 psi foam.

1. Change the sand to gravel?
It really depends on alot of variables. Does the basement have a draintile system?
2. Place a 6 mill poly sheet down first or on the top of the foam?
Technically, the poly should be on the warm side of the insulation, so on top of the foam is the correct method per the book. Seeing as the actual ground-to-basement temp is relatively close, it doesn't matter near as much as above grade walls and ceilings. If there's a chance you'll damage the plastic during the pour, install it under the foam.
3. What is exactly the name of the builders tape I should use to join the plastic poly together.?
Most any duct tape will suffice, just lap the joints at least 6".
4. Do I really need to put in a 6 inch wire mesh in the concrete?
In a basement, no.
5. How do I attach the plastic to the wall.?
Just let a few inches run above the chalk line and it will stand on it's own. It can be cut flush w/ the floor later and caulked. OR, you can cut 1/2" thick foam insul. about 3-4" high and mount it beforehand to help hold the plastic & create an effective thermal break.

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