Q: One visitor asked, "I have a 175 year old farmhouse with wide plank flooring in the kitchen. It is very uneven, as well as the foundation of the house being on a downhill slant in the kitchen. What should I use to put over the existing floor - we have considered 3/8, 5/8 or 3/4" plywood. Is this appropriate?"
A: I think that would depend what you want to accomplish by using the plywood. If you are looking for a smoother, more even surface to install a hardwood floor over, then you should be fine with 3/8 spruce plywood, screwed through the existing pine planking, into the floor joists. But this will not eliminate the slope you mention. How much of a drop is there from one end of the room to the other? If it is very severe, then you may have to either build an additional sub floor over this, or, even better, remove the sub floor that is existing, and install shims on the joists as needed to make them all the same height. In this case, you could either use the boards you have removed as your sub floor, or use 3/4 plywood.
Related questions about wood floor installation:
>Is it not true that the wood should have sat in the house for a week before moving in?
>What's the best wood floor for a kitchen?
>Will I need to install a new floor, or can I salvage this one?
>What is your ballpark figure for installation of hardwood?
Types of Flooring
>Hardwood and the hardness scale?
>Where can I find ebony flooring in Toronto?
>Is it a bad idea in general to screw/nail down part of a floating laminate floor?
>What is the best wood to install in a home with a large dog?
>Should we buy the thicker engineered hardwood?
>Would wide plank flooring would be suitable in the Edmonton, Alberta region, with its cold, dry winters?
>What is the difference between a varnished, laminated and pre finished floor?
>If a pre-sanded v-groove hardwood floor is laid, buffed and varnished 3 times, how much of a 'groove' will you see/feel?
>How do I prepare my sub floor?
>Tongue and groove flooring over concrete?
>Should we remove some of the multiple layers of subfloor before installing?
>Should a water vapor barrier be put down if the hardwood flooring is to be installed over osb over a full unfinished basement? How should the flooring be laid? Parallel or perpendicular to the floor joists?
>I'm planning to install 3/4" Hardwood in our rooms, but there are some uneven spots. Is there any kind of leveling compound we can use?
>Do I have to remove the old flooring in the kitchen for the transition to the rest of the house without having to put a subfloor under the rest of the house to bring it up to level with the kitchen floor or can I use some sort of transition strip?
>I understand that we have to install solid hardwood over 3/4" plywood. I'd like to install the plywood now and paint it. Can I later put hardwood down over the painted plywood?
> I installed 3/4 OSB directly over a concrete slab, above grade, with a vapor barrier Rosen paper and Nailed down 3/4 Maple. What problems can I look forward to?
>Is it possible to put something overtop the particle board before putting down carpeting or hardwood to help with sound proofing?
>Is it good to put a new oak floor over an old one, or is it better to tear up the old one and put new plywood boards and then the new oak floor?
>Can we lay the plywood over the parquet? (And a bit about bamboo!)
>Should I install laminate over hardwood?
>How can I level out the subfloor with the cement lips for installation?
Ripping out Old Floors & Salvaging
>How do I remove an old floor?
>I want to salvage some oak flooring from a house that is being torn down.What is the best approach to avoid spliting and cracking of the flooring?
>How do I safely salvage a gymnasium floor?
>Is there anyway to remove and relocate 3/8 strip flooring?
>How do I tear up these floors without damaging them further?
>Should I remove the glue on the parquet I tore out before I install it somewhere else?
>How do we remove the plywood sheeting and tiles that are on top of our hardwood?
>My foyer has 1/4 inch plywood glued down over the old hardwood. How do I remove it?
>I'm in the process of removing laminate floor titles that had been glued on oak hardwood floors in the dining room. eventually, I'll be getting the floors in the whole house sanded and refinished, but until then, is there aneasy way to get the sticky glue residue off without harming the wood? Or canI at least put something down that won't be a problem come sanding time butwill keep me from sticking every time I walk on it?
>How do we get the old lanolium off the floor to get to the wood?
>How can we remove carpeting which was glued to wooden steps about 30 years ago?
>Installing damaged salvaged maple flooring?
>How do I remove tile to install a hardwood floor?
>How and how long do I dry this salvaged maple?
Radiant Heat and Sound Proofing
>Can I install hardwood over radiant heat?
>We have some concern about noise/sound insulation. what is the best product to use? How should it be installed?
>I would like to have my floors redone so there will no more uneven floor and sound proof a little in the process. What do you suggest here?