subfloor

A floor is the bottom surface of a room or vehicle. Floors vary from simple dirt in a cave to many layered surfaces made with modern technology. Floors may be stone, wood, bamboo, metal or any other material that can support the expected load.
The levels of a building are often referred to as floors, although sometimes referred to as storeys.
Floors typically consist of a subfloor for support and a floor covering used to give a good walking surface. In modern buildings the subfloor often has electrical wiring, plumbing, and other services built in. As floors must meet many needs, some essential to safety, floors are built to strict building codes in some regions.

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  1. C

    Concrete subfloor leveling issue

    Hi - I ripped up laminate flooring on a concrete subfloor. It was my first DIY project and instead of using mortar to even out any glue that was stuck on or sand off, I used a thin layer of self leveler. I mixed it correctly but for some reason still wasn’t level so I tried grinding it with an...
  2. D

    Which subfloor should I us in my bathroom?

    Hello all, I need some advice please. I recently had a contractor in to remodel my bathroom. However, we fell out on the first day of the works because he did not want to agree to remove the waste from the works he would have been doing even though he had advised me to get a skip for the waste...
  3. M

    Caulk to seal seams on OSB subfloor

    Long time listener, first time caller. I have seen this both ways: Do you recommend sealing the seams between the 1/8 gap in the subfloor with caulk, or does this prevent the expansion/contraction of the wood? If caulk is used, what kind of caulk do you recommend? Also, if someone can...
  5. mestanovsky

    Advice for tile over unconventional wood subfloor?

    I’ve got 3/4” MDF over 1-1/2” t&g car decking, over 6x8” joists on 48” centers. All solid, good shape. Specs for cement board and ditra seems to suggest I should give up hope of successful tiling because of wide joist spacing. But I want to believe. And think the thickness of Mdf+ car decking...
  6. G

    Level Subfloor Under Plywood Before Tiling?

    I'm off level 1/8'' over 2' and 1/4'' over 4', from left to right in picture. Building recessed shower for schluter pan. What can I use to shim between joists and plywood to level out? Roofing felt? Drywall shims? I need something I can screw through but which won't compress. Looking for...
  7. djkprojects

    Plywood for Wetroom subfloor

    Hello guys, I'll be converting one of my upstairs bedrooms into an en-suite/wetroom and I want to replace th existing floorboards with plywood but struggling to figure out which type I need. I understand that it should be hardwood plywood which is at least EN 636-2 and EN314-2 Class 2 compliant...
  9. H

    Subfloor build up advice for tile

    If starting from joists, what subfloor would you use these days? 18mm Ply first and then a 6mm backer board layer? (correct thicknesses?). Plan is to tile floor with porcelain tile 20x20cm, electric heating mat under. Thanks.
  10. H

    Subfloor layer advice

    If starting from joists, what subfloor would you use these days? Ply first and then a backer board layer? (what thicknesses). Plan is to tile floor with porcelain tile 20x20cm, electric heating mat under. Thanks.
  11. J

    Tiling over plywood subfloor - advice needed

    Hi, DIY home owner here in need of advice. Following a waste pipe leak that's now been fixed, I'm renovating my kitchenette. To start with I wanted to remove the old laminate flooring and put tiles instead. I removed most of the laminate yesterday and found that the 18mm plywood (please can you...
  13. K

    Plywood subfloor preparation questions

    As an introduction, I'm a DIY home owner who has gutted the bathroom in a house built in 1980 due to a burst water pipe. I had a professional water mitigation company remove the damage so I'm sure all of the affected material is now gone. I have decided to put large format tile on the floor in...
  14. M

    18 or 25mm plywood subfloor

    Some advice would be greatly appreciated! So I'm putting in wet underfloor heating and limestone tiles in kitchen/living. The underfloor heating pipes will be laid inside 20mm routed cement coated xps board which can be tiled directly on top off. My question is, would an 18mm plywood subfloor...
  15. M

    Subfloor for underfloor heating

    Hello. We're going to be installing large limestone tiles with wet underfloor heating in our kitchen/living area of the house. At the moment it's gutted and we have the opportunity to start from scratch as we're back to the joists. I'm looking to tile on to either 18mm routed cement boards or...
  17. M

    Hello! 1st time tiling

    Hi all Was scouring sites and pages for advice on the best way to prep floors and came across this forum. We've had an extension built and are thinking of tiling our new utility room and cloakroom. Most of the floor is new screed, but the cloakroom is where the new floor meets the existing...
  18. R

    Subfloor

    Hi all, after some advice way in advance. We are currently extending arvoss Backnof our house, we have about 40sqm of block and beam on insulation that will be liquid screed. Then when we knock through the existing is timber suspended floor (currently floorboards).we wanted to use porcelain...
  19. E

    Subfloor preparation old house

    Hi, first post here. I've been lurking this forum for advice for a while, thank you all who share your knowledge. I'm to tile a kitchen of an old (old old) house, farmers concrete with NO DPM, house has no dpc, stone walls. Area 17 sqm, waves up to 12 mm difference, to be finished with...
  21. TCI589

    New subfloor no expansion gaps

    Hi all, First time DIY tiles here. We fixed down a hardibacker subfloor yesterday with rapid set adhesive, etc. On 3 walls weve filled in the gap between the board and the wall in a complete brain fart. Overnight with the window open, we heard a series of popping noises from the floor. Is...
  22. S

    subfloor for slate tile floor on hallway

    I would like to install slate tile on the hallway and foyer (blue rectangles) of my house. However, I don't think the framing in the hallway meets the L/720 deflection necessary for natural stone. So I was hoping I could get some advice and opinion on fixes and feasibility of such a project...
  23. R

    Tiling onto tampered concrete

    Hi everyone, hope you're all well :) I've been asked to tile a large area of floor, the newly laid subase is tampered concrete so my question is, should I use self levelling or uncoupling membrane before tiling? I know I cant tile directly onto the concrete. The condition of the subase is good...
  25. M

    Best subfloor advice

    My client is wanting a loft floor tiled with 600x600 polished porcelain tiles. Hes building a new frame for the whole floor (40m2). Hes wanting to put 18mm ply on top for me to tile onto. I'm trying to advise him to use backer boards.....but it seems the client knows best😁 Usually I would walk...
  26. S

    Replacing cracked tile - slope on subfloor

    Hi All. I am replacing a cracked tile (porcelain 60x60). However I have noticed the subfloor is sloped slightly, the adhesive that was on before was a lot thicker at the bottom of the tile then the top so I don't think its recent movement. What is the best way of dealing with this? Should i...
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