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Self Leveling Compound

 
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Old 02-14-2017, 04:36 PM   #1
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Self Leveling Compound


Hi. I'm pouring self leveling compound over a plywood floor. I've done this in the past over sub floors that were in fairly good shape. For those, I applied a primer, then steel lathe/mesh, then I poured the leveling compound. Has always worked great.

For this job, the floor is sturdy, but old and has tons of larger gaps. I'm considering putting down 15 lb roofing felt, then steel lathe/mesh. Will this be a problem if the leveling compound isn't bonding directly to the wood floor? When I've done demo I've seen plenty of times where there was lathe was on top of roofing felt, and the leveling compound was more of a mortar and pretty thick. For this floor I do plan on leveling from feather to about 3/4".

Thanks!
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Old 02-14-2017, 04:47 PM   #2
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Re: Self Leveling Compound


I should add, I'm tiling on top of the floor once leveled.

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Old 02-14-2017, 05:11 PM   #3
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Re: Self Leveling Compound


Caulk the gaps in between sheets of ply. No roofing felt under SLC.
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Old 02-14-2017, 06:47 PM   #4
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Re: Self Leveling Compound


I could be wrong but i think the felt is a bad idea....there would be no bond and it would chip and break easily where it is thin. Caulk the gaps to keep it from running through


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Old 02-14-2017, 07:03 PM   #5
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Re: Self Leveling Compound


Isn't it wrong to have a concrete product directly on wood?
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Old 02-14-2017, 08:24 PM   #6
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Re: Self Leveling Compound


I think it's fine to use concrete on wood, but the wood must be primed first. If not, you do run the risk of poor bonding or the wood absorbing too much moisture and lifting or separating if plywood.
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Old 02-14-2017, 09:57 PM   #7
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Re: Self Leveling Compound


As above, you need to use the correct primer first, to both seal the subfloor and create a good bond to the SLC.
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Old 03-04-2017, 09:04 AM   #8
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Re: Self Leveling Compound


Always best to follow manufacturer's instructions regarding this. I agree that caulking gaps in plywood is key - if they're small enough. If not, then an additional layer of underlayment might be considered. Also, we sometimes run blue tape around the perimeter of the room to avoid the SLP flowing into areas we don't want it to.

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