Sealing around penetrations in cinder block


Old 01-24-07, 08:05 PM
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Sealing around penetrations in cinder block

What is considered best practise for sealing around conduit and pipe that penetrates through a cinder block wall above ground level?

I know that 'expanding foam' could be used, but I was wondering what is considered the _right_ way deal with gaps around things such as conduit or pipe where it feeds through a wall?

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Old 01-24-07, 08:28 PM
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IMO: Outside- in- Any moisture barier. Thru a fire wall, Flame retardant fill.
And a touch of mortar,for both.

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Old 01-28-07, 07:26 AM
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I have had good luck using vinyl concrete patch. It comes in a quart sized tub premixed, and you can apply it and smooth it out with a putty knife. I used it when I rewired and replaced all the metal outlet boxes in a cinder block house. I basically set them level by wedging in a few small rocks, then applied the material. For larger holes to fill, you will need a second coat as you will get a little shrinkage when it dries. It works great for filling holes that have been drilled into the block, and it is paintable.
Old 01-28-07, 04:18 PM
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Duct seal?
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