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DIY & Home Improvement

(7,172 posts)

5. It appears to be cement board underlayment.

Sat Oct 29, 2022, 03:57 PM

Oct 2022

If so, it seems to suggest that when it was installed, the intention was to tile over it.

It will degrade over time, due to moisture and traffic. Additionally, since the joints aren't sealed, moisture will leak into the wood substrate. You can see the degradation in your first photo.

It may be salvageable. Contact a tile installer for an opinion.

Modern cement board (Durock):

https://www.usg.com/content/usgcom/en/products/floors-tile/tile-prep/cement-board-backer-board/durock-cement-board-with-edgeguard.html

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Highlight:

Does anyone know what this coating is? [View all] Takket Oct 2022 OP

Looks like an anti slip coating DetroitLegalBeagle Oct 2022 #2

It looks like fiberglass mesh. They may have put it down Phoenix61 Oct 2022 #3

Maybe this: sl8 Oct 2022 #4

It appears to be cement board underlayment. OilemFirchen Oct 2022 #5

kicking for an answer WhiteTara Oct 2022 #6

I think #4 has correctly identified it. RockRaven Oct 2022 #7

thanks everyone! DUers are the best Takket Oct 2022 #8