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Posted by hallerb@aol.com on April 7, 2008, 8:14 pm
On Apr 7, 2:06=EF=BF=BDpm, nmbexc...@hotmail.com wrote:
> Often times when you install plumbing valves or electrical boxes on an
> exterior concrete block wall you have to chip out concrete. Since
> those are block wall once you chip it you have a six inch deep hole.
>
> So after you installed everything, what do you do with the cavity
> behind it? Do you fill it somehow?
>
> Someone told me I should spray some foam filler in it...I am not so
> sure, I have seen some of those when expanded basically "glue" onto
> any surfaces, I think if I have an overspray it may expand to seal off
> the shutoffs for a valve and if it's an electrical box it may be
> flammable?
>
> Any advise? leave it alone or fill it?
>
> Thanks in advance,
>
> MC
use expanding foam to fill voids, after cementing around at least one
side of the entrance.
you dont want air leaks, expanding foam helps keep cement from falling
in cavaties
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