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Gaps under insulation an issue?

g1teg

Member
Joined
Mar 10, 2019
Messages
22
Location
In my dreams
Hi all,

Been loving the help I get here. Reading lots, and on the questions I've had so far, great help! I did search for this, and I've watched a lot of videos, but see different results so I wanted to ask.

I have been backfilling a large hole with 7/8 GA to bring my grade up where I need it. This week, I got to the height of my Mono pad footings (spec'd at 12", I'm going 16"). I got it relatively flat, compacted and ready to go.

I then built up a 10" pile in the center, which my pad will sit on. 6" pad. Using the laser, I made sure it was lower than 6" everywhere, but close. Raked and compacted as flat as I could.

Installed my 2" insulation, but now that the seams are taped, I can really tell there are some low spots and it flexes when I walk.

TL;DR - my insulation flexes when I walk on it, should care?

Big deal? Concrete will weigh it down? or tear it out and flatten the pad perfectly?
 

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Tracs

Well-known member
Joined
Feb 1, 2015
Messages
569
Location
Manitoba, Canada
Hi all,

Been loving the help I get here. Reading lots, and on the questions I've had so far, great help! I did search for this, and I've watched a lot of videos, but see different results so I wanted to ask.

I have been backfilling a large hole with 7/8 GA to bring my grade up where I need it. This week, I got to the height of my Mono pad footings (spec'd at 12", I'm going 16"). I got it relatively flat, compacted and ready to go.

I then built up a 10" pile in the center, which my pad will sit on. 6" pad. Using the laser, I made sure it was lower than 6" everywhere, but close. Raked and compacted as flat as I could.

Installed my 2" insulation, but now that the seams are taped, I can really tell there are some low spots and it flexes when I walk.

TL;DR - my insulation flexes when I walk on it, should care?

Big deal? Concrete will weigh it down? or tear it out and flatten the pad perfectly?

I am not a concrete expert but I would not be concerned at all. The weight of the concrete will weigh down the styrofoam and then the contractor will level the slab at floor level.
 
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