Questions tagged [underlayment]

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38 views

How should we complete this laminate installation?

Problem I purchased some pergo gold underlayment and pergo waterproof laminate flooring and installed it in the kitchen with my brother. This was our first time ever installing any type of flooring, ...
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1answer
25 views

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

I'm replacing an old LVP floor, which required an underlayment, with a new brand LVP that has an underlayment built-in. I'd think that to mitigate sound and vapor, a reasonable thing to do is to ...
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21 views

Several layers of polyethyleen sheets as a vapor barrier under underlayment & laminate

I am putting 7mm laminate on concrete. I have underlayment (5mm) that requires >0.2mm polyethyleen (PE) sheet as a vapor barrier. Unfortunately, I couldn't get >0.2mm PE but got 0.16mm PE ...
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1answer
55 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 ...
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1answer
193 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 ...
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1answer
49 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 ...
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56 views

Laminate floor directly over plywood subfloor ok?

We just ripped up carpet in a room and found that it had 1/2" plywood over the joists and 5/8" particle board on top of that. We are planning to install 10mm laminate flooring in this room. ...
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1answer
163 views

Plane floor joists, sand subfloor, or sand underlayment to handle hump in floor for cork plank flooring?

I am planning to install 5/8 in. plywood underlayment for some floating 1/4 in. cork plank flooring. Unfortunately, there is a hump in the floor spanning three joists, based on my measurement and ...
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2answers
99 views

How should I handle reflooring the bathroom of an old house?

We are updating the bathroom in our old house and after removing the old tile and concrete we found that it was sitting on 3/4" subfloor planks, and some of them are not in the best shape. We are ...
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1answer
54 views

What tape is appropriate for underlayment?

I am installing bamboo flooring with Floormuffler underlayment. This type includes a moisture lip & adhesive for joining the long sides. I have a few seams to join that don’t have the lip/adhesive,...
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1answer
340 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, ...
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1answer
47 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). ...
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1answer
215 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 ...
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1answer
770 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 ...
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1answer
32 views

Underlay for saddle roof? Does side matter?

I am renovating my attic. Because the house is about 150y old there is no underlay. I installed an underlay from the inside by stapling an underlay to the bars which hold the roof. The underlay should ...
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49 views

What underlayment material is this? Is it safe?

This underlayerment was found in a bathroom. It was under a cement layer with tiles on top. The house was constructed in the late 1980s. What material is this underlayerment made of? Is it safe to ...
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3answers
501 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 ...
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1answer
293 views

What kind of underlayment material is this?

This was found under two layers of sheet vinyl flooring in a late 1940s house. Subfloor is fir and there appears to be a black tar-like mastic between it and the wood. The green underlayment feels ...
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1answer
481 views

Do I need to add plywood underlayment over plywood subfloor?

I am replacing downstairs flooring that had three layers before the subfloor. Linoleum, Cement Board and Tile. All flooring had to be removed down to the subfloor due to water leak. Since the cement ...
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1answer
92 views

Why is roof underlayment nailed in?

Roofing underlayment ("felt") is immediately covered with shingles which are nailed in. So what isn't it redundant to nail in the felt as well? If the only purpose is to keep it from sliding off ...
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1answer
239 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 ...
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5answers
6k 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 ...
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1answer
159 views

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

I'm adding some Vinyl down in a shower room and nailed down the underlayment. But the nails keep popping up a little evey time I add more nails. I'm concerned these will be felt under the vinyl. ...
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2answers
56 views

What type of underlayment is appropriate for metal roofing?

I'm building a shed with a metal roof. What underlayment material should go between my OSB roof deck and the steel panels?
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1answer
626 views

Tile underlayment, Ditra vs wire mesh lath

My previous kitchen tiles were laid on top on wire mesh and mortar. Except for a few smaller grout cracks they were relatively okay and flat. After removing the tiles, mortar, and mesh I have ...
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0answers
106 views

Installing Plywood Underlayment over Plywood Subfloor

We are renovating an apartment and trying to install a 3/4'' solid hardwood floor in the living room. We pulled out the existing carpet along with a 5/8''particle board underlayment. Under that we ...
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1answer
162 views

Subfloor tolerance for engineered hardwood

I am installing (floating) 3/8" engineered hardwood with 1/8" QuietWalk underlayment on a cement slab. I have used a grinder and leveling compound to remove the large valleys and hills. Now I have ...
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35 views

Can I use underlayment to increase thickness level of engineered flooring

I need to increase the 1/2” thickness of the engineered flooring as much I can. Is it ok to use 1/8” underlayment. I plan to nail not float.
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0answers
19 views

Underlayment (vapor, moisture and sound abatement) under marble tile floors

Do you use an underlayment (vapor, moisture and sound abatement) on top of concrete subfloors and under marble tile flooring? Ultimately the marble will not be installed using traditional mudding ...
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1answer
90 views

How messy to get underlayment off of concrete floor?

Because of my cats, the carpet of my dining room is really in horrible shape. I live in a townhome. I replaced carpet on the second floor with bamboo flooring without too much mess since the ...
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2answers
964 views

Tile over 2x6x1.5 T&G subfloor, spanning 48" beams

Long time lurker, first time poster. I think I might have a solution to my problem but I'd like to get some peer review on it before I start work. I'm remodeling a master bath (50sf, 10x5) in a 1966 ...
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2answers
81 views

Flatness requirements for bamboo laminate flooring

I'm installing Lumber Liquidators' Morningstar XD bamboo laminate flooring in my basement. According to their tech support, they have the following flatness requirements for the underlayment: (1) ...
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1answer
30 views

Underlayment question

Question..I have a 3/4" wafer board?..Particle board? sub floor..which is laying on laminated joists that are 24" apart..my thoughts were to lay a 1/2" sanded underlayment to that perpendicular to sub ...
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2answers
984 views

underlayment for laminate flooring: anything to substitute with?

Are the any substitutes for underlayment? The reason I'm asking is I have about 1 sq. meter of plywood to cover with underlayment, but I don't want to buy the whole roll. May be there's a way to cut ...
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1answer
1k 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 ...
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3answers
698 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 ...
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1answer
219 views

Can I reuse carpet underlayment pad?

I recently ripped off the old carpet in a room, along with the under-pad. The pad is in a decent condition, so I'm wondering it could be the re-used somewhere? Of course I would not use it again for ...
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1answer
1k views

Preparing uneven floor for cement board

I have two sections of flooring that are currently uneven by about 1/4". One side is 3/4" OSB, and the other is 3/4" Plywood. Both sides are screwed and glued onto joists. I'm planning on putting ...
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1answer
42 views

How should I decide which flooring underlayment is best? [closed]

There's a few options of underlayment in local stores, fairly cheap and more expensive (based on cork, I guess). What are the differences, and what factors should I consider to make a choice? I'm ...
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1answer
391 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 ...
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1answer
130 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-...
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1k views

Is underlayment necessary for laminate over dricore?

We have new dricore subflooring in a basement that is partially above and partially below grade. There have been minor water seepages in the past thru the slab, which is why we put in the dricore. ...
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0answers
22 views

Underlayment for Enclosed porch

I want to install porcelain tile in my glass enclosed porch. Presently there is a 6” x 5/4” pressure treated lumber for the floor. The floor is only 2 years old and in very good condition. Can I use 1/...
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2answers
512 views

Underlayment for a roof valley? should I put underlayment?

Should I put underlayment on the entire valley and then put the ice/water shield over it? Should I put the ice/water shield directly onto the wood of the osb valley then staple the underlayment ...
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2answers
9k 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 ...
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0answers
298 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: ...
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2answers
304 views

Is our flooring contractor extending our hardwood floor correctly?

As part of our kitchen renovation, the contractor is extending our hardwood floor. As you can see in this photo, they have cut out boards from the old floor and are adding new boards. I think this is ...
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1answer
2k views

Why is 1/4" underlayment supposed to be parallel to the subfloor?

Per instructions of my 1/4" plywood underlayment that will be used for Vinyl loose-lay flooring, it states to run it parallel with the existing 3/4" T&G OSB flooring. I always assumed that ...
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2answers
5k views

how to remove the particle board subfloor underlayment quickly?

I have a master bedroom and office which have particle board underlayment. I can tell it is off-gassing formaldehyde because I can smell it! I plan to replace the carpet in a month so I'd like to ...
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68 views

Is subfloor / underlayment for tile different for a small area

Normally for plank subfloor one is supposed to add 1/2 inch of plywood plus cement backer board for underlayment. For a small area say 4 feet by four feet is all of this necessary?