7

I recently purchased around 600 sq feet of 3 1/4 inch solid hickory from Bruce, which I'm installing over a crawl space. I put down a 6 mil vapor barrier in the crawl space.

I'm measuring the moisture level of my plywood subfloor as the wood has been acclimating about a week. Most readings are right around ~13% with the overall range being 10-13% with some spots measuring as high as 14%. This is during the humid August summer in Kentucky.

The wood still has some time to acclimate. Readings for it at the moment are around 9-10%.

I'm wondering whether I'm in a safe position to install solid hardwood here. I'll be installing this with a #15 felt underlayment. If it matters the bedrooms have 2 1/4" red oak installed (might be original to the house) and those floors are in great condition.

isherwood
  • 158,133
  • 9
  • 190
  • 463
Andrew
  • 71
  • 1
  • 2

4 Answers4

2

I had a similar situation with a house redo with a crawl space. This house is near the coast in Maine and both the contractor and flooring company strongly recommended against using tradional wood flooring on the first floor. They were concerned with cupping of the wood. It got to the point where the flooring company - all they do is wood flooring- would not warranty the work unless we used engineered flooring. It was about $1.5 more per foot but it’s been 3 years and have been very happy

Greg Pelletier
  • 21
  • 3
1

Your post reads like you have an understanding of the implications of moisture on a hardwood floor. I think the existing oak floors are a good indication that your project should go OK. The key points that I have to offer are:

Ventilate the crawl space. Covering the ground with plastic is not a substitute for ventilation. Let the flooring, sub-floor and hickory, dry before installing the hardwood. Six percent moisture is a good target for both. I like to let the hardwood spend some time, sticker-stacked with air-space around each board, in the environment that it is to be installed in. Installing hardwood directly from garage storage, to an air-conditioned bedroom, for example, may lead to floor board shrinkage.

Carl Ernest
  • 132
  • 4
0

A sealed vapor barrier is indicated. More importantly, there should be insulation below the subfloor. If the crawl space cools the floor below the dew point of the air in the room, there will be expansion of the flooring, and there could be condensation.

Rigid foam insulation, cut to size, with suitable R value for the climate is indicated, and recommended. Remember that household preferences and conditions will change. A house with one person in it may be dryer (lower dew point) than one with children, pets, fish and plants. In the dead of winter house with a higher dew point may have condensate or frost accumulating on (relatively) un-insulated surfaces.

mongo
  • 1,128
  • 6
  • 9
0

...Assuming you have some sort of flooring that is removable, I would consider using marine plywood and replace that area. That is what we use in extreme wet conditions such as a car wash. The marine plywood withstands water and moisture during all operating hours and is exposed without problems. EDIt: Is this actually in regards to the crawl space if not why is the question worded as such with all the extra info.. Cheers

norcal johnny
  • 1,613
  • 9
  • 12