Questions tagged [underlayment]

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Should I insulate the floor of my four-season porch? [closed]

We have an enclosed 4 season conditioned porch. The joists are like 8 to 10 inches off ground. Ground has 20 mil vapor barrier on ground. The floor was reframed with 2x8s but the flooring isn't down. ...
Robert Thomas's user avatar
2 votes
2 answers
278 views

What underlayment for LVT on concrete subfloor?

My previous question, which led me to go with LVT, was answered here. I saw this question and guess that (6-mil plastic) could be an answer but I'll give you guys the details and see what you think. ...
xtratic's user avatar
  • 125
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2 answers
32 views

Subfloor, underlayment and backer board [closed]

So long story short… When starting a bathroom rehab I installed 23/32” OSB (exposure 1 panel) and I planned on using 1/4” Hardiebacker board for ceramic penny tile sheets. Finally getting to this ...
Tony's user avatar
  • 11
0 votes
1 answer
105 views

Is there a drawback to underlayment between multiple layers of subfloor?

My upstairs sub flooring is 5/8" plywood, which is screwed to the joists. I want to add an additional 3/8" layer of plywood, followed by floating 1/2" bamboo flooring. I plan on using a ...
Troy Blackburn's user avatar
0 votes
1 answer
62 views

In my bathroom, should I install sheet vinyl on hardiebacker board or plywood?

I don't want to deal with seams or grout, so I'm going with vinyl sheet flooring in my bathroom. The bathroom floor is low at the transition to the hallway, and also at the toilet flange, so I'd like ...
Emily's user avatar
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0 answers
30 views

Subfloor or underlayment?

So, I have been doing a lot of research and could not find a solid answer. There seems to be different opinions. For my half-bathroom renovation, I am starting fresh. For flooring, for the first layer ...
Zeetwo's user avatar
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0 answers
22 views

Is GripRite Shingle Underlayment -LWE an OK replacement for Tyvek HomeWrap under vinyl siding?

I have a contractor replacing old aluminum siding with vinyl siding. The contract stated Tyvek would be used, but I just noticed today (unfortunately 2.5/4 outer walls are already 'finished') that ...
Reen2D2's user avatar
2 votes
2 answers
92 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
0 votes
0 answers
51 views

Is there anything I should know before laying OSB underlayment on top of my subfloor?

I'm removing (painfully) all the particle board underlayment from the 1976 and replacing it with OSB so I can lay down some LVP. The process seems simple. Lay down 4x8 sheets and screw into the joists ...
Andy Cheng's user avatar
0 votes
0 answers
62 views

Can I replace 3/4 particle board underlayment with 1/2 OSB?

I ripped up carpet to replace with LVP in my 1976 bi-level home to find 3/4 particle board on top of the subfloor. I then found out that the particle board should be removed. I spoke with a friend who ...
Andy Cheng's user avatar
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0 answers
153 views

Replacing 2 layers of tile, can I put plywood + Ditra mat OVER lathe and scratch?

We're redoing our 2nd-floor 7' x 10' laundry room, including new / moved cabinets and flooring. The existing tile was ~1/4" lower than the vinyl plank outside the room, so I (naively) assumed we'...
Trezero's user avatar
0 votes
0 answers
28 views

1/2" OSB underlayment + Durock VS 3/4" + Durock

I am planning my subfloor from the I-Joists up for a new build in my kitchen and living room. My thought, to minimize the transition between rooms was to lay 3/4" OSB for the living areas, and I ...
DJ Nick's user avatar
0 votes
1 answer
306 views

Can I put plywood underlayment under Ditra/tile?

I'm taking up hardwood floor in a bathroom and will be replacing with tile. The hardwood was put in over wood chipboard(?) subfloor with 1/8" plywood underlayment. In order not to have a huge ...
TheGremlyn's user avatar
1 vote
1 answer
141 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
0 votes
0 answers
26 views

Pre-Padded Flooring

I am looking to install vinyl flooring in our basement which comes with pad attached. Can I use an additional pad? Lots of research is finding conflicting answers, as well as from salesman from ...
Chris's user avatar
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0 votes
0 answers
846 views

Vinyl Sheet Flooring -- Underlayment?

I'm looking at laying down some vinyl sheet flooring in my basement. Currently it's just a concrete floor with a layer of DryLok I've painted over it. My question/concern is, do I need some type of ...
NoName's user avatar
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0 answers
90 views

Vinyl Plank Flooring Repair

Questions Flooring was already done before. Removed a drywall in the kitchen recently and leaving the floor unfinished. Removing the whole plank and add a new one is better? Or patching is better? ...
Ajax's user avatar
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1 vote
0 answers
79 views

How best to remove flooring and underlayment from our tile floor

We are renovating a 1961 rural house in France. The ground floor is garage/basement, but both the first and second floors (in European terms) are a 30cm hard concrete subfloor with 10cm (4 inches) of ...
alvion's user avatar
  • 131
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
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1 answer
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I need some subfloor advice, please

I need some subfloor advice, please. 1. What size screws do you use to screw down the 3/4” plywood Subfloor to the floor joists? 2. The kitchen has two layers installed already. 3/4” Subfloor with a 5/...
I am Not A Carpenter's user avatar
0 votes
1 answer
694 views

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

We're doing some renovations and got to the flooring and I'm unsure how to proceed, so I'd love some input. A few things for context: House was built in 1961 Single story Raised foundation 3/4 ...
Matt's user avatar
  • 53
-1 votes
1 answer
409 views

Vinyl Plank Flooring underlayment and backing options

I'm deciding on vinyl plank flooring for a kitchen in a rental property and I'm seeing different options. Cork backing feels incredibly nice under the feet. Other product have a rubber honeycomb ...
RocketManZ's user avatar
1 vote
2 answers
424 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
0 answers
65 views

Can 23/32 advancetech subflooring be installed over 3/4 wood plank subfloor?

We are working on laying vinyl plank flooring. After getting the carpet up, we found that the subfloor was particle board with glue stuck all over it, so we decided to rip it up and go with 23/32 ...
Spudman's user avatar
  • 11
0 votes
1 answer
68 views

Is Tri-Ply an acceptable underlayment for shingles?

My handyman wants to use GAF brand TriPly underneath the new shingles he's installing for the roof repair project. It's a small area and we had half a roll left over from the shed roofing project. Is ...
YesterdaysTools's user avatar
2 votes
2 answers
215 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
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1 vote
0 answers
56 views

Can you wet shim above a tub?

Is it possible to wet shim around a newly installed tub to bring all the walls plum and flat before tiling? Using a foam waterproof backer board and want to make sure that I’m laying tile the correct ...
Mark's user avatar
  • 11
2 votes
2 answers
417 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
0 votes
2 answers
118 views

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

I removed some tiles today and found not just thinset and an underlayment but a few layers of mesh and what appear to be stones or concrete. What is this, why was this used and is there anything ...
podcastfan88's user avatar
2 votes
0 answers
74 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
1 answer
122 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
257 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
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 votes
1 answer
2k views

Can I use an underlay on glue down vinyl planks?

I would like to reuse some luxury vinyl planks (5 year old Armstrong Luxe Plank with FasTak pressure-based adhesive, just under 4mm thick) that I pulled up from my concrete basement floor and put them ...
kd7iwp's user avatar
  • 109
0 votes
1 answer
404 views

USG Fiberock underlayment used for tile installation

I reinstalled the tiles in the laundry room and the installer used USG Fiberock, instead of Hardiebacker - as initially told me. He’s telling me that USG Fiberock is good for laundry room. But now I ...
Dan's user avatar
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0 votes
0 answers
145 views

How large of a hole can I cover with just 1/4" underlayment?

I am redoing a bathroom and as such I am moving the shower feed piping (~3/4" holes), the drain (~2" hole), and also an air return (4x8" hole). I plan to use porcelain 12x24" tiles....
Brydon Gibson's user avatar
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
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0 votes
0 answers
81 views

12x24" Porcelain Tile over 2x6x1.5" T&G Spanning 48" Beams

I have some questions in regards to installing 12x24" porcelain tile over 1/2" plywood underlayment that sits above 2x6x1.5" T&G subfloor that is supported by posts and beams on 48&...
trazerr's user avatar
  • 11
-1 votes
1 answer
169 views

Does combining a hybrid vinyl plank with attached underlay and external underlay help to achieve even greater soundproofing?

Hybrid vinyl planks come with acoustic underlay attached to them. For example the one that I am after has LnTw of 40 db. The question is if I install that on top of an extra 2mm acoustic underlay, say,...
xbmono's user avatar
  • 121
1 vote
0 answers
100 views

Stone tile flooring with acoustic sound reduction requirement in condo

We just closed on a new condo and want to replace some of the old carpet with stone tiles. However, the HOA has a sound reduction requirement where the floors must pass acoustic testing with 55 IIC or ...
Gene Locascio's user avatar
0 votes
0 answers
375 views

For a floating floor - Is it safe to use an underlayment above an existing vapor barrier?

I have a concrete slab floor, and it was very uneven, so I placed a vapor barrier down (6ml poly) and then I nailed 3/4" plywood overtop. This fixed a lot of issues with the floor being uneven. ...
Gary Holiday's user avatar
0 votes
1 answer
551 views

Does DMX 1-Step underlayment need to be screwed down onto concrete?

I am looking to use DMX 1-Step dimpled underlayment in my basement for a finishing project. I looked at the installation checklist and it does not seem to mention anything about how it attaches to ...
Andy Hall's user avatar
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0 votes
0 answers
59 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, ...
Jonx1000's user avatar
0 votes
1 answer
847 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 ...
Tony DiNitto's user avatar
0 votes
0 answers
40 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 ...
Fibo Kowalsky's user avatar
1 vote
1 answer
76 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
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
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
0 votes
0 answers
1k 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. ...
rothloup's user avatar
  • 745
1 vote
1 answer
837 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 ...
rossy__'s user avatar
  • 17