Questions tagged [underlayment]

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6 votes
2 answers
6k views

How can I prevent an above-ground pool underlayment from failing due to erosion at one location?

I have had an above ground pool since 2008. The pool was installed professionally. I have had to replace the liner 3 times, professionally installed as well. We have talked with the pool installer, he ...
Jennifer's user avatar
5 votes
5 answers
7k views

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

I am installing a new bathroom floor. I plan on getting an electric underfloor heating mat, 2 backer boards for under the heating, screed the mat and tile over this. My question is can I place the ...
Jamie Smith's user avatar
5 votes
4 answers
9k views

Soundproofing a floor: How about cement backer board w/ Green Glue and mass-loaded vinyl?

I've been researching soundproof underlayments for floors, but the selection seems to be very paltry. It appears that you're pretty much stuck with mass-loaded vinyl (MLV), QuietWood, and a few other ...
oscilatingcretin's user avatar
5 votes
1 answer
450 views

What type of underlayment should be used when installing engineered floors?

I'm going to install floating engineered wood floor in a 3rd floor condo. It has plywood subfloor. My biggest concern is the noise of walking on the floor that people below me will suffer. My ...
zihaoyu's user avatar
  • 287
5 votes
2 answers
18k views

Does cork flooring underlayment have to be glued down?

I'm finally getting around to installing an engineered floating floor in our living room. It's 1/2" thick. I am looking at using 1/4" cork underlayment underneath such as this from Home Depot. It ...
DA01's user avatar
  • 24.3k
5 votes
4 answers
3k views

What underlayment should I use to reduce traffic noise under a hardwood or bamboo floor?

I'm in the process of renovating the 2nd story of my New England 1.5 story cape-style home. New OSB subfloors are down with Liquid Nails and deck screws over 5 weeks ago. I'm on to flooring now. I ...
OneHander's user avatar
4 votes
3 answers
25k views

What glue should I use for glue-down engineered flooring installation?

I bought a roll of FloorMuffler UltraSeal underlayment (essentially, sealed high-density foam) at Home Depot for this project. The instructions are very specific about which adhesive to use: "To be ...
user443854's user avatar
  • 1,273
4 votes
1 answer
950 views

Should I continue to remove the cement board, or just remove the tiles?

I'm in the middle of replacing the tile in my bathroom and started to take off the backer board but now I'm wondering if I should've just cleaned off the top of the boards and reused it. The backer ...
Henry Ong's user avatar
3 votes
5 answers
44k views

What type of underlayment should I use for an above ground pool?

I recently bought a non-inflatable, steel frame above ground pool (12 ft diameter, 3 ft depth). I want to set it up on a slab of concrete, but I have a couple of concerns about the wear on the bottom ...
Eric's user avatar
  • 439
3 votes
2 answers
4k views

Proper Orientation for Plywood Subfloor under 3/4" Hardwood

I recently purchased a house in New Jersey and the 2nd floor was filled with old carpet that we wanted to replace with hardwood flooring. I ripped up the carpet only to find particle board under all ...
Matt Cannon's user avatar
3 votes
2 answers
2k views

Is underlayment necessary in a room over a garage?

It is my understanding that underlayment beneath laminate flooring reduces sound between floors, i.e. for the room below. Is there a functional purpose beyond reducing noise in the room below? I'm ...
jn29098's user avatar
  • 133
3 votes
3 answers
391 views

Checking ground current

Background: I had a contractor finishing my basement, and part of that was installing underfloor heating using several heating mats in parallel. It worked initially but soon after it just started ...
JKoether's user avatar
3 votes
2 answers
13k views

Tiling over old 2x6 tongue and groove subfloor. Underlayment? Levelling?

So my house has 2x6 car decking/tongue and groove/whatever-you-want-to-call-it subfloor that I am going to tile over, both in the kitchen and the bathroom. The rest of the floors are 3/4" oak as you ...
tbox's user avatar
  • 759
3 votes
2 answers
577 views

Does it make sense to put quality (=pricy) underlayment over 3/4" subfloor+1/2" extra plywood layer?

I have standard subfloor + 1/2" plywood on top, to correct for joists going different directions, so that all hardwood boards can be laid one direction for a clean look and avoid sagging where they ...
Marius's user avatar
  • 31
3 votes
3 answers
15k views

Is it recommended that 1/8 thick plywood be used as underlayment?

Redoing bathroom floor. After removing tiles and underlayment and linoleum, the floor that's left is decrepit, uneven, wavy, has some old plumbing holes. It is not rotted though, the wood is sturdy. ...
Noob's user avatar
  • 133
3 votes
1 answer
793 views

Do I need to remove cap nails before re-roofing?

If I have existing decking with old tar paper that I want to remove the tar paper and install synthetic underlayment, do I need to remove all existing cap nails in addition to the tar paper or can I ...
aqua0322's user avatar
3 votes
1 answer
207 views

Securing plywood underlayment to timber sub-floor

I am laying 12mm plywood on existing timber flooring (before laying Hardiebacker board & ceramic tiles). Apart from screwing the ply to the sub-floor, should I also use grab adhesive or thinset ...
BlazeyBoy's user avatar
2 votes
2 answers
212 views

Working with concrete-like float between plywood and flooring

I am total beginner, so please bear with me. I live in a second floor condo unit (built around 1997). I recently removed a closet and discovered that my carpet rests on some sort of underlayment, ...
MGamboa's user avatar
  • 123
2 votes
1 answer
120 views

What type of subfloor material is this?

I ripped out the carpets and foam underlayment from the living room of my 1975 oceanside New England townhouse. I’m trying to figure out if this is homasote/ hardboard/fiber board or plywood. I don’t ...
Yann Stoneman's user avatar
2 votes
1 answer
1k views

Subfloor repair for LVP installation

I'm preparing to install luxury vinyl plank in the living area of the second floor condo I just bought (carpet was installed previously). It's a woodframe condo with a wooden subfloor built in 1985, ...
aknodt's user avatar
  • 439
2 votes
3 answers
282 views

Are there any things to consider when putting thick rubber underlayment down?

I am finishing my attic and have just completed laying the OSB subfloor. I plan to use this space as a yoga studio for my wife / guest room for family / playroom for my child. It is directly over my ...
Chris's user avatar
  • 451
2 votes
2 answers
88 views

How to install flooring over a sleeper subfloor?

1970s subfloor basement construction I'm currently redoing my basement and after removing the carpet I come across particle board nailed on top of 1.5 x 2.5 wood batons that are screwed into the ...
Runnye's user avatar
  • 21
2 votes
2 answers
411 views

Should I add a plywood underlayment between my chipboard subfloor and new wood floorboards I want to install?

Question I’d like to remove carpet in a bedroom, and install a 14mm thick engineered oak floor instead. (The floor boards will have a multi-ply core, like these ones). Between the chipboard subfloor ...
jfhector's user avatar
2 votes
1 answer
603 views

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

We are in the middle of updating our guest bathroom and while removing the vinyl flooring we found that it was sitting on a 1/2" particle board underlayment. Given that particle board in a wet ...
Jess's user avatar
  • 21
2 votes
2 answers
1k views

To lap or not to lap underlayment over concrete

I am installing engineered hardwood flooring over concrete slab below grade in the basement. The flooring installation instructions mention that if using 6-mil poly underlayment, it should be lapped ...
Corrupter of Code's user avatar
2 votes
1 answer
253 views

Click-lock floating engineered hardwood over particleboard?

Bought a house Friday. House was built in 1975. Carpet with particleboard beneath looks to be relatively new. I pulled up the carpet and the particle board is in great shape. No stains or water ...
Chris Harrington's user avatar
2 votes
1 answer
394 views

How thick should my tile underlayment be?

Am remodeling, and installing tile floor. Joists are 2x8 16 o.c., subfloor is 5/8 plywood perpendicular to joists, for underlayment should I use 3/8 plywood+1/2 in. backerboard or 5/8 ply+1/4 in. b-...
Ray's user avatar
  • 21
2 votes
1 answer
297 views

What type of underlayment should be used when installing engineered wood over underfloor heating

I have recently purchased an engineered wood floor and wish to install this over underfloor heating (A Nu-Heat water based solution which sits between the joists). The joists are currently covered ...
DIY_fool's user avatar
  • 121
2 votes
1 answer
6k views

new laminate flooring over existing hardwood, what underlayment should be used?

We're redoing the flooring in the whole house. We have existing hardwood which is in decent shape. a few scratches here or there that could probably be fixed. No buckling or anything. Maybe one or two ...
merk's user avatar
  • 627
2 votes
0 answers
73 views

Karndean over underlay

I'm laying Karndean Korlok planks. I've taken out the engineered wood floor I'm replacing. I have a Tredaire underlay below over the concrete, that for acoustic insulation. It's 6mm thick rubber. Do I ...
And Finally's user avatar
2 votes
0 answers
414 views

Proper installation when replacing particle board underlayment with 3/4 advantec over 1/2" plywood subfloor?

My home's flooring was originally 1/2 plywood subfloor with 3/4 particle board underlayment. I have since removed the particle board and plan to replace it with 3/4 Advantec. My current plan is: ...
dspano's user avatar
  • 121
2 votes
1 answer
406 views

Can I install Delta-FL in only part of a basement?

I've been looking at finishing my basement and am leaning towards using 7/16" OSB over Delta-FL for the subfloor. I was also considering leaving some areas as bare cement (laundry room, utility room, ...
Brad Mace's user avatar
  • 2,495
1 vote
1 answer
3k views

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

I've seen many variations of my situation discussed here, but I'm new to all of this and I want to make sure my plan is sound. I'm finishing a bonus room over the garage that currently has only a 1/2&...
rrberry's user avatar
  • 19
1 vote
1 answer
75 views

A creative Eco-friendly Underlayment for a metal roof? [closed]

I am building an octagonal cabin with a 200 sq ft metal roof (Grandrib 3) at a 30 degree pitch; the roof will sit on wooden strapping and will eventually have insulation below it contained by a ...
Jesse Yishai's user avatar
1 vote
1 answer
80 views

Should I have my contractor redo the underlayment?

I’m having my roof redone and on the roof where my roofer is going to install standing seam metal roof he put down Winterguard HT fastened with staples (because it was cold so it didn’t stick well). ...
IgniFerroque's user avatar
1 vote
1 answer
4k views

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

I am intending to instal self stick tiles over a primed luan underlayment in a bathroom. However, the manufacturer's instructions clearly state: DO NOT install over unsuitable or unstable subflooring ...
But those new buttons though..'s user avatar
1 vote
3 answers
3k views

Suggestions to hold floating laminate floor from sliding on vapor barrier installed over concrete slab

I need suggestions for keeping a laminate floating floor in place during installation on a vapor barrier over concrete. I was hoping to hear of good ideas to prevent this slip/slide effect on the ...
2and2IS5's user avatar
1 vote
2 answers
14k views

Plywood underlayment over plywood subfloor - how to secure

I am taking up carpet & particle board and putting a new layer of 1/2" plywood underlayment over the plywood subfloor prior to installing 3/4" hardwood (nailed down). I know I should orient the ...
APJ's user avatar
  • 13
1 vote
3 answers
18k views

can I install cement backer board over plank subfloor

I have old plank subfloor installed at a 45 degree angle to the floor joists. How should I install cbu(cement backer board) on top of this for a tile installation? The entire area is approximately ...
joe's user avatar
  • 510
1 vote
2 answers
419 views

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

I pulled up some carpet in my house, built in 1954, in Des Moines, Iowa. Under the carpet pad is a rubbery black layer with marks on it that resemble Treadbright, used for truck bed accessories. Is it ...
Frank's user avatar
  • 11
1 vote
1 answer
1k views

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

I am looking into inexpensive options to level OSB for installing luxury vinyl planks. I read an article that talks about using roofing shingles to level out subfloors before installing hardwood. I am ...
Aimy's user avatar
  • 35
1 vote
1 answer
2k views

Best method to use carpet samples squares to create a Rug? [closed]

I have plenty of carpet samples and I wanted to make an area rug with them. I would like to make a rug out of them, maybe I can create a pattern with the carpet squares and then glue them to some ...
sonya's user avatar
  • 11
1 vote
1 answer
4k views

Self leveling showing popped bubbles and small chunks

I did self leveling concrete in my basement as below But some spots showing small holes, potentially from popped bubbles And some have little pieces like chunks not mixed well I plan to install ...
HP.'s user avatar
  • 1,842
1 vote
3 answers
2k views

Can I combine 1/2" and 3/8" plywood for a total of 7/8" subfloor for laying a hardwood floor?

We have some old flooring that comes to a total (flooring and planks) of 1 5/8" from the top of the joists. I want to add a new section of flooring (this one) beside it, and am trying to get them to ...
Matthew Goulart's user avatar
1 vote
4 answers
9k views

Should I use uncoupling membrane for tile on concrete floor?

One flooring company said they would install an uncoupling membrane when installing tile over my 100-year-old basement laundry room's concrete floor. OIs there a good reason to do use a membrane? ...
glenviewjeff's user avatar
  • 1,450
1 vote
1 answer
236 views

Bathroom Tile Removal - Underlayment and membrane coming up

I'm removing all the tile in a bathroom. While removing though, I believe it's the underlayment is coming up with some of the tiles. I was wondering what are the reprecussions of this. Picture: ...
Justin Warner's user avatar
1 vote
1 answer
137 views

Is 23/32 plywood too thick, heavy to be used as underlayment over 3/4 plywood subfloor?

I am finishing a project started by someone else so I don't know the logic behind material selection. It's a second floor Accessory Dwelling Unit stripped down to the 3/4 plywood subfloor except for ...
Yvonne Ayala's user avatar
1 vote
1 answer
29 views

Substrate for exterior paver blocks to achieve grading

I am putting some paver blocks around my shed, which is small enough not to have gutters so I would like the immediate surrounding, most of which will be covered by these blocks, to be graded away ...
amphibient's user avatar
  • 7,459
1 vote
2 answers
4k views

How to fasten 1/2" plywood underlayment to 1/2" plywood subfloor

I'm preparing my floor to install new 3/4" solid hardwood flooring. I started off ripping up the old carpet and 5/8" particleboard. That left the 1/2" plywood subfloor. My plan is to ...
Nathan Gross's user avatar
1 vote
1 answer
129 views

How to install pre finished hardwood over existing softwood floor

I have 200 square feet wood floors that do not appear to be hardwood, they are in pretty bad shape and need refinishing or replacing. The quotes we got for refinishing are $600. As I said the floor ...
user379468's user avatar