jsmith6752
Well-known member
will etching damage foam board? I have perimeter foam and the top edge is showing. Also, if it runs down under the slab will it damage the pex? thanks
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foam board
- Thread starter jsmith6752
- Start date
K'ledgeBldr
Well-known member
Muriatic acid?
I'd probably check MSDS's for known reactions
I'd probably check MSDS's for known reactions
Edger
Well-known member
It would be better to seal the foam edge to stop acid going down there.
pdham
Member
The acid will react with the concrete and quickly neutralize. There should be no damage to the pex tubing. As far as the foam goes, the concrete adjacent to the foam will neutralize the acid. As a general rule the acid is still active if it is foaming while in contact with the concrete. Once the foaming stops it is neutralized.
OP
jsmith6752
Well-known member
thanks.......appreciate that
bas157
Well-known member
If you've got a little scrap piece of the foam board, put some acid on it and see how it reacts. I think it may depend on how you put the acid down if it would be neutralized before hitting the foam board. If you spray it, some might hit the foam directly