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Questions tagged [underlayment]

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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
18 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
20 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
31 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
54 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
52 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
75 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
33 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
73 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 ...
2
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1answer
45 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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173 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
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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2answers
111 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
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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0answers
176 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
98 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
411 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
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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0answers
48 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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3answers
4k 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
1k 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
157 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
145 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
280 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
786 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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836 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
120 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
97 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
339 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
77 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 ...
1
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1answer
64 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
212 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
4k 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 ...
1
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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 ...
2
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1answer
153 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
92 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
521 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 ...
2
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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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0answers
375 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
216 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
130 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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0answers
620 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) ...
3
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1answer
137 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 ...
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2answers
393 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 ...
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1answer
539 views

How to correct possible subfloor l/360 deflection under live load, when basement below is finished

Installing porcelain planks 6"x 36" with 11mm thickness, in main floor Living room that was previously carpeted. House is 2 story town, 13yrs old. Room size across W 18' x Length joist span of 11.8'(...
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2answers
1k views

Is fan fold insulation an acceptable underlayment for hardwood?

Is fan-fold insulation an acceptable underlayment for hardwood? It is being used as a leveler from one floor level to another.
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1answer
135 views

Should I put down underlayment when putting a layer of tile on top of another?

I have two layers of tile down. The suggestion is to tear off the first layer of tile and then put on new Armstrong tile. One contractor has underlayment in the bid, while the other does not. Do we ...
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1answer
578 views

Trying to understand how to lay cork underlayment mats with duck tape. based on discussions

In this answer, user user2264997 suggested. You can staple it down - not as messy and fairly quick. I've used something like this on a remodel. It was 3/8" cork over plywood subfloor, then bamboo ...
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3answers
6k 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. ...