Questions tagged [underlayment]

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17 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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31 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
46 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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24 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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11 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
22 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
55 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
40 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
22 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
106 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
71 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
76 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
65 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
187 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
36 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
125 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
48 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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267 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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15 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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179 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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2k 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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232 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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124 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
515 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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2k 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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61 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?
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5k 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 ...
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3answers
2k 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? ...
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2answers
175 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 ...
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2answers
182 views

Is a moisture barrier needed over gyp-crete (gypsum concrete) for wood / bamboo flooring?

In a condo, and just discovered that the floor is actually gyp-crete, presumably over wood. Is a moisture bnarrier necesary? This is above grade.
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1answer
322 views

Can I use a different brand of underlayment under my Pergo laminate floor and still be covered under the warranty?

I am not sold on Pergo Gold brand Underlayment. From reading reviews, there seem to be a good amount of unhappy customers who have used it. They say it crunches under the flooring when you walk on it. ...
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2answers
918 views

Underlayment for vinyl plank flooring

I recently noticed a low spot or sag where my kitchen, hallway and dining room meet. I pulled up the carpet to find what appears to be 1/2 inch toung and groove OSB (the actual floor) that was not ...
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1k views

Vinyl Flooring Over Uneven Concrete Slabs

Our attached garage was added many years after my house's 1959 construction by basically walling in a pre-existing carport. The floor, therefore, is made out of several concrete slabs and part of what ...
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1answer
128 views

Installing ceramic tile on top of wooden bathroom floor

In the middle of a bathroom re-model and at the point of replacing the floor. Removed the existing vinyl tile from the floor and a bit confused about what is underneath. Not sure what is needed for ...
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1answer
106 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: ...
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1answer
411 views

Screw & Glue Subfloor and Screw Underlayment

I'm replacing a floor in a bathroom. I've ripped out everything down to the joists. Is it okay to: a) screw & glue the subfloor AND b) screw the underlayment Should I use nails? I don't ...
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1answer
88 views

Subfloor Thinner than the Underlayment

I ripped out the subfloor and underlayment in my bathroom. The subfloor plywood was thinner than the underlayment plywood. Should I make the subfloor thicker than the underlayment when I lay the new ...
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1answer
72 views

Subfloor & Underlayment Plywood

Is it okay if the underlayment is thicker than the subfloor? When the home was originally built it looks like they used a thinner plywood on top of the joists with a thicker underlayment on top of ...
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2answers
227 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 ...
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2answers
5k 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 ...
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1answer
2k views

Should I replace particle board underlayment before installing ceramic tile?

I'm converting a bedroom into a bathroom. It looks like the current subfloor is 1/2" MDF or Particle board (I'm not really sure). This sits on top of 2x8 tongue and groove. I've read that MDF and ...
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1answer
171 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 ...
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1answer
99 views

Which underlayment, if any, between 5" pine boards, and subfloor with radiant heat?

Seems to be a lot of differing opinions on this. I get that having something between the two can offer less squeaking, some noise abatement and depending on material - a vapor barrier which I may or ...
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2answers
1k 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 ...
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1answer
572 views

What's the best type of underlay for bamboo flooring

I am building a new house and it sits on piers. The sub-floor I am using is yellow tongue particle board. I have just bought some bamboo floors and wondering what's the best type of underlay for it ...
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1answer
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 ...
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381 views

is cork underlayment on a concrete basement floor a workable proposition?

Next up in my basement finish process are the floors. We've decided to go with vinyl for the bathroom (and under-stairs closet), and carpet everywhere else. I'm planning on putting in a 6mil plastic ...
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1answer
240 views

Two layers of underlayment for sheet vinyl?

I'm installing sheet vinyl flooring in the bathroom. Home Depot told me to get this hard plywood, just under 1/4" thick for underlayment. I'm concerned though because my sub floor is 10" or 12" wide ...
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3answers
133 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 ...
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651 views

How to apply floor patch on underlayment for sheet vinyl

I am going to put down some new sheet vinyl in our bathroom. I have put down plywood underlayment according to the instructions. I am now trying to fill in the indents of the screw heads (#2 square) ...