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Old 07-14-2011, 06:53 PM   #1
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How to fix thermal break in cinder blocks


I removed some old brick from the front of my house and found open cinder blocks underneith. I'm affraid this is a thermal break so I 'd like to fill it, but I'm wondering if I could pour some sort of insulation in them (like polystyrene beads) then put some concrete over it to cap it off? The holes look like they go about 4 feet deep. Any thoughts?



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Old 07-15-2011, 12:01 PM   #2
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How to fix thermal break in cinder blocks


You could. It's not really a thermal break. More like an air infiltration issue. The styrofoam will stop some air convection through the cores, but won't really insulate much. I trust you're going to put the brick back into place. If so, you may want to look at putting a through-wall flashing on top of the block to prevent any moisture or condensation from reaching the framed wall along with some weeps on the bottom course of brick.

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Old 07-15-2011, 12:32 PM   #3
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How to fix thermal break in cinder blocks


The block itself is the thermal break. Filling the cores won't remedy that, it may help thermal efficiency slightly though. If you want really insulate this wall and removal thermal breaks then rigid foam sheathing is the way to go...
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