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Installing hardwood on bowed subfloor

BgBmBoo

Well-known member
Joined
Sep 25, 2015
Messages
386
Location
Kansas
I'm in the planning stages of redoing our home flooring. It is currently a mix of carpet, tile and laminate and we planning on going back with either hardwood or laminate.

My question is, given that solid/engineered hardwood flooring is fairly thick, can it be installed on a slightly bowed surface? Either parallel or perpendicular to the bow in the subfloor?

The problem: most of our home is on a poured basement and is relatively level and solid. However, when remodeled in the 80's two walls were pushed out approximately 6 feet to expand two rooms on opposite sides of the home. A combination an massive shrink/swell clay soil and inadequate footer depth means the two expansions move vertically as the soil moisture changes. Essentially the home has "wings" that move up and down a small amount depending on soil moisture . Other than a few small cracks in the walls, it has not been an issue for the 31 years that is has been this way.

I have installed laminate before, but never real hardwood and am trying to decide if hardwood is even an option given my situation. I would imagine hardwood that requires nailing is not a good idea due to the flex, but how about the newer floating lock together engineered hardwood floors? It is my understanding that even the engineered flooring is still 3/4" thick and I am concerned it will not want to follow the contour.

FWIW, one room currently has laminate flooring placed perpendicular to the bow in the subfloor. The bow is gradual and even and the laminate floor follows the contour of the subfloor. We have experienced no issues with the floor wanting to buckle or separate at the joints. In fact, you can't even tell the floor is uneven unless you lay down and look at the surface. Or drop a marble...

So what do you guys think?

Thanks in advance.
 
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kd3pc

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Joined
Aug 10, 2013
Messages
3,630
Location
Northern Neck
If the bow is not too bad, you can make up level with felt/pads/float and then install the full floating laminate. YMMV, no, your mileage will vary. IF you like the feel of the full float and the laminate choices available, you may be OK. We don't like either, even the expensive stuff - "feels" funny underfoot.

Real hardwood, is now made up of short lengths, unless you custom cut, so those short lengths actually enhance the flaws in the sub-floor. You really need something flat for real hardwoods and likely a moisture barrier, if the sections move as much as you say.

Laminate is the likely choice. It really comes down to which compromise you like better and how much rise/fall you can look at every day.
 
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