Foam around exterior basement windows


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Old 05-26-21, 02:32 PM
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Foam around exterior basement windows

Can anyone explain this to me?

not the original owner so not sure what was done here. I have a block foundation and each of the windows has about a 3-4” piece of foam insulation (I’m assuming) running along the sides of the windows as you see in this picture where part of it is exposed.

I am looking to get my foundation parging re-done and noticed it. Not sure what it’s purpose is or if it can be removed/replaced as it ages.

 
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Old 05-26-21, 03:54 PM
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My guess is that the entire foundation is insulated that same way then they parged over it with a modified acrylic foundation coating.

So, no... Don't remove it.
 
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Old 05-26-21, 04:11 PM
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It’s not. Just these strips around the windows. It’s obvious because where the old parge is flaking off you can see that it’s cinder block.
 
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Old 05-26-21, 04:59 PM
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Regardless, I dont know why you would remove it.
 
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Old 05-27-21, 04:01 AM
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Are the windows retrofitted or replacements? The foam is there for a reason. It might not be a good reason, maybe a shortcut or best someone could do with what they had to work with. To take off that foam might open a can of worms. It is likely adhered with mortar and the foam will come off and leave the mortar behind. Then you will have a new problem to deal with. And maybe the problem is only in one window and the rest are done for symmetry.If you are redoing the foundation finish you will give the foam another coat, too thus more protection.
 
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Old 05-27-21, 05:35 AM
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All four basement windows have it on either side.

the house was originally a bungalow that was knocked down and rebuilt about 10 years ago so I don’t have much history as I’m not the original owner.

I do know that these guys were definitely fans of rigid foam board insulation as the entire interior of the basement walls have it installed behind the drywall.

on that note, seems to be keeping the basement cool and dry. Just not sure about the outside as I know bugs love foam board.
 
 

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