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9 votes

Can I install heat mat and backer board over cork flooring?

When I am redoing a bathroom and adding the needed backer board to a subfloor assembly, I would remove all existing finish floors no matter how many to get back down to the original subfloor. Then ...
Jack's user avatar
  • 35.5k
4 votes

Why is roof underlayment nailed in?

Staples are far more prone to cause leaks than roofing nails. For a pro roofer with a coil nail gun, they save no time at all .vs. using nails. For a non-pro who can actually use a hammer, they save ...
Ecnerwal's user avatar
  • 218k
4 votes
Accepted

What type of subfloor material is this?

Looks like Homasote® - fibrous with that waffle-weave surface, structure more or less like 1/2" thick paper. Natively gray/grey but aged and carpet underlayment stained, at a guess. Suitable (I ...
Ecnerwal's user avatar
  • 218k
4 votes
Accepted

Working with concrete-like float between plywood and flooring

This looks like "gypcrete", a gypsum-based cement product used to level and stiffen subfloor and deaden inter-floor sound transmission in multi-family dwellings. I'm not familiar with the ...
isherwood's user avatar
  • 139k
3 votes

Can I reuse carpet underlayment pad?

I would not bother with used pad . You can get new inexpensive rubber pad of the appropriate thickness when you need it. I have reused older type pads , you can never get them clean; dirt goes ...
blacksmith37's user avatar
  • 8,311
3 votes
Accepted

What sort of nails should I be using on Sheet Vinyl underlayment?

Unless installing a rigid material such as new plywood, luan, cement board, etc - you generally do not nail it down. When you do, ring shank is the right type of nail. But it has to be a decent ...
noybman's user avatar
  • 2,025
3 votes

Can I install heat mat and backer board over cork flooring?

I've never had to do this (install tile over cork), but I think you need to remove the cork. Backer/cement boards needs to be firmly fastened to the sub-floor. Any kind of softness, give, or "...
SteveSh's user avatar
  • 6,912
3 votes
Accepted

Why is it a bad idea to install self-stick tiles over luan plywood?

Luan plywood tends to have a ton of resin and other chemicals in it (due mostly to the species of wood used). This can leach out and stain tile grout or vinyl flooring (or cause adhesive issues due to ...
isherwood's user avatar
  • 139k
3 votes

Should I have my contractor redo the underlayment?

The problem is that if there is an issue with the product at some point in the future, the manufacturer will deny any warranty claim because the installation instructions were not followed. If this ...
jwh20's user avatar
  • 23.4k
3 votes
Accepted

Subfloor repair for LVP installation

Professional flooring installers would flood from the high point to the low point with self level. They typically charge per bag and I've seen this kind of job cost 15k when done for more than one ...
Fresh Codemonger's user avatar
3 votes
Accepted

A creative Eco-friendly Underlayment for a metal roof?

Red Rosin Paper (which is a bit old-school, but can still be found) would fill the bill, I believe. It's plant based. Seems to be getting sold for floors now, but was the thing people used before ...
Ecnerwal's user avatar
  • 218k
3 votes

Installing 3/4" plywood underlayment over 1/2" subfloor

If it were me, I would act as if this new layer of 3/4" plywood were the only one going down. i.e. Lay down adhesive around the perimeter and and along each joist line below Screws around the ...
FreeMan's user avatar
  • 47.4k
3 votes

What is this type of subfloor (mesh and stone?) and what's the easiest way to remove it?

It's a TCNA (Tile Council of North America) F141 or F145 (mortar bed, aka "mud job") base layer, and removing it (rather than just popping the tile off of it) is needless waste of effort ...
Ecnerwal's user avatar
  • 218k
2 votes

Should I use uncoupling membrane for tile on concrete floor?

This is a subjective question that depends on individual risk tolerance. I wouldn't bother. My previous home was a similar situation, with several cracks and no expansion joints. It was obvious that ...
isherwood's user avatar
  • 139k
2 votes

To lap or not to lap underlayment over concrete

DO not overlap as it will cause a noticeable uneven floor when walking over the areas. We cut to size and tape where the underlayment meets. Overlap the wall areas and once flooring is complete ...
norcal johnny's user avatar
2 votes
Accepted

Bathroom Tile Removal - Underlayment and membrane coming up

You need to tile over a solid surface. Needless to say, this stuff doesn't count, so you'll need to remove it. With a wooden subfloor, the preferred tile base is cementboard. Screw it down, mortar the ...
iLikeDirt's user avatar
  • 12.6k
2 votes

can I install cement backer board over plank subfloor

Virtually all brands specify minimum 5/8" plywood or OSB as a base. I have to say, if it was my house and there were significant challenges related to plywood installation (plank removal difficult, ...
Jimmy Fix-it's user avatar
2 votes
Accepted

Plywood underlayment over plywood subfloor - how to secure

First, I'd counter your plans to orient the second layer perpendicular to the subfloor. Plywood and OSB have a strength axis that should run across the joists. Instead of turning the top layer, simply ...
isherwood's user avatar
  • 139k
2 votes

Replacing particle board underlayment and building up floor height to lay tile

Plywood would be a very good choice. You should consult the ditra literature for your particular joist spacing, however, generally the bare minimum thickness for plywood/T&G subfloor under ditra ...
MG Funs's user avatar
  • 41
2 votes

How should I decide which flooring underlayment is best?

The question is quite broad, but there are two primary differences (aside from cost): sound management and the ability to level imperfect subfloors. Sound management (deadening, which can reduce ...
isherwood's user avatar
  • 139k
2 votes

Preparing uneven floor for cement board

I would use 1/4inch Luan panels and install without adhesive. Just install to manufacturers specs. This is typically to lay it down and use 1/4 inch crown staples, 1 inch long, every 6 inches along ...
Joshua's user avatar
  • 164
2 votes
Accepted

Self leveling showing popped bubbles and small chunks

I just did my concrete floor for vinyl plank, and I would be concerned more for the flatness the the floor that it is within the tolerances needed. The bumps can be scraped off, at worst ground off. ...
Jack's user avatar
  • 35.5k
2 votes

How messy to get underlayment off of concrete floor?

Asbestos use in construction in the United States was banned in 1977 so there should be no asbestos in your house. To get the underlayment off, I would recommend using pouring adhesive remover ...
Justin Todd's user avatar
2 votes

Can I install heat mat and backer board over cork flooring?

If you read James Hardie installation you need to thinset the board down with modified thinset so over cork no don't do it
user110568's user avatar
2 votes

Best method to use carpet samples squares to create a Rug?

One method, like in this YouTube video, would be to use heat bond carpet seaming tape. Pro carpet installers use it with a special iron to seam carpet together, but you can use a clothes iron since ...
Alaska Man's user avatar
  • 13.6k
2 votes
Accepted

Need to level OSB board for LVP, pros and cons of using roofing shingles?

I think it would totally impossible to get good results using that method. LVT is pretty flexible. I've remodeled a rental house and personally (not a contractor) installed LVT. It turned out pretty ...
George Anderson's user avatar
2 votes

Can I use a flooring underlayment in conjunction with a LVP plank that already has an underlayment built-in?

I am installing LVP now with attached pad, additional pad will void your warranty. Anyway, you don't want too much cushion as this will affect the locking of the planks. You can also verify through ...
Mike's user avatar
  • 21
2 votes

What is this material under the carpet pad in my 50's home?

Dangerous? Only if you're allergic to horses. The premium carpet padding of the day was horsehair in a matrix of rubber. It was much more durable than foam rubber waffle-type padding. It retained its ...
MTA's user avatar
  • 11.4k
2 votes

How to encapsulate mastic/cutback that contains asbestos on plywood subfloor?

Floor leveler does not need lath and is super simple to do. The drawback is it can be expensive depending on how many bags you need. If any ridges or dips are no thicker than a nickel, you can put ...
RMDman's user avatar
  • 31.2k
2 votes

How to install flooring over a sleeper subfloor?

If the lumber on the floor is not rotten after 50 years, no need to remove it. What you might well want to do is fill in between it with 1.5" insulation board, because the odds that there's ...
Ecnerwal's user avatar
  • 218k

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