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Old 02-12-2015, 07:47 AM   #1
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Cinder Block prep before XPS


Hi everyone, what is the proper way to prepare cinder block interior walls before adhering XPS to them with PL-300?

I removed old basement walls and fiberglass and let the walls dry (some moisture trapped behind wall/vapor barrier). Now, there is some leftover fiberglass residue and some efflorescence.

Thank you!





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Old 02-12-2015, 08:23 AM   #2
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Stiff bristle brush to knock off any debris.

Other than that, PL will grab it pretty well.
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Old 02-12-2015, 08:49 AM   #3
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Stiff bristle brush to knock off any debris.

Other than that, PL will grab it pretty well.

Thanks, I figured a brissel brush would be good but had read somewhere to wash down with borax/water solution. Wasn't sure if that was necessary.
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Old 02-12-2015, 08:55 AM   #4
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The wash helps remove the dust that tends to interfere with the initial contact grab by my experience.

Borax would be for oils and greases but I don't see that being an issue here unless you are an impressionist painter on the other side of the basement.



Are you framing the wall out after that?
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Old 02-12-2015, 08:59 AM   #5
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Quote:
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The wash helps remove the dust that tends to interfere with the initial contact grab by my experience.

Borax would be for oils and greases but I don't see that being an issue here unless you are an impressionist painter on the other side of the basement.


Are you framing the wall out after that?

Thanks these walls are untouched by anything other than dust, fiberglass, and the efflorescence you see in the photos.

Once the block is prepared, I am going to glue XPS on with PL-300 and then frame 2x4 walls in front of that.
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Old 02-12-2015, 09:27 AM   #6
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Once the walls are framed be sure to shim up behind the two by force to take up the space between the foamboard in the two by fours. This will help keep the foam towards tight to the wall.

Be sure to seal all the seams in the foamboard so that no conditioned air can make it to the concrete wall.

If the efflorescence is significant scrape it off with a scraper and a light solution of vinegar and water will probably etch off most of the minerals.
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Old 02-12-2015, 10:07 AM   #7
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Quote:
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Once the walls are framed be sure to shim up behind the two by force to take up the space between the foamboard in the two by fours. This will help keep the foam towards tight to the wall.

Be sure to seal all the seams in the foamboard so that no conditioned air can make it to the concrete wall.

If the efflorescence is significant scrape it off with a scraper and a light solution of vinegar and water will probably etch off most of the minerals.
Thanks, I plan to seal the seams (they are also tongue and groove) with tuck tape vapor barrier tape. The top and bottom will be sealed with spray foam. The top of the cinder block and the joist spaces will also be covered with XPS and everything sealed with spray foam.

I do plan to put the wall tight to the XPS unless the wall is not straight then I will have to space appropriately. I will hold the XPS tight to the cinder block with 2x4s against them while they dry.
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Old 02-12-2015, 10:43 AM   #8
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You got it nailed down perfectly.

Good luck with it and you did a nice job with the window so I suspect this should turn out about the same.
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Old 02-12-2015, 10:55 AM   #9
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You got it nailed down perfectly.

Good luck with it and you did a nice job with the window so I suspect this should turn out about the same.
Thank you, I will be starting a log to document the entire basement renovation. Just waiting until I have a little more to start with!
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