Cement products rated for ground contact

mtmprop · Sep 26, 2023

I need to seal gaps around an old converted porch due to critters getting in.
Are there any products such as cement boards that I could make ground contact with.
I mainly need something to fill in areas where the footer doesnt come up to the old joists in all areas leaving a gap.
I plan to mesh & stucco over to finish and blend with the rest of the house or worst case cap with aluminum.
I have not found any cement board rated for ground contact. Hardie, Durarock are not

stick\shift · Sep 26, 2023

For gaps, hydraulic cement is often the product. Is there a reason this won't work for you?

mtmprop · Sep 26, 2023

yes there is nothing there to adhere it too. Picture missing or rotted boards and an old converted porch which overhangs a foot from the old foundation.
I need to close up with something then mesh and stucco. i can fasten or glue to side of old foundation then seal up.
I'm leaning toward CDX pressure treated plywood rated for ground contact then mesh and stucco.
If they made a cement board for ground contact it would save the mesh and stucco part.

Half-fast eddie · Sep 26, 2023

Hardieboards would work. Cement backer boards for ceramic tile would work too.

Randy Bush · Sep 27, 2023

Hardieboards is not rated for ground contact. Will absorb moist and can delaminate.

Cement products rated for ground contact

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