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Old 01-30-2008, 06:56 PM   #16
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moisture barrier issue: oak hardwood over concrete slab


Paul

After watching the video again it appears to me that:

1 The wood is still nailed to the subfloor.

2 The subfloor layers are still intact (screwed together?)

3 Moisture is getting to the plywood or finished floor, and causing it to expand. Not enough to buckle but enough to cause a bulge or lifting of the entire floor system. Creating that spring in the floor.

What you may be able to do to fix it is selectivly remove some boards and attach the plywood to the slab. If done properly it will eliminate the spring. This is by no means a perfect solution, but short of a complete removal, this may be your best option to save the floor. This should be done by a professional with experince in board replacment or you will end up ugly repairs. Done properly you will not be able to see the repairs.

A few more questions:

1 Was the concrete moisture tested prior to install?

2 Did they allow proper expansion room at walls?

3 Do you have humidity issues in the house?

4 Since discovering the problem have you moisture tested the wood and plywood?

Hope I can help.

Jim

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Old 01-31-2008, 09:55 AM   #17
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moisture barrier issue: oak hardwood over concrete slab


Good insights, Jim. One of the things that concerns me is that screwing the plywood to the slab will compromise the moisture barrier even further.

>>After watching the video again it appears to me that:

>>1 The wood is still nailed to the subfloor.

>>2 The subfloor layers are still intact (screwed together?)

Yes, the two layers of plywood were screwed together, left floating on the slab.

>>3 Moisture is getting to the plywood or finished floor, and causing it to >>expand. Not enough to buckle but enough to cause a bulge or lifting of >>the entire floor system. Creating that spring in the floor.

That's what I'm thinking--it's getting through the moisture barrier below (6 mil plastic with duct tape at the seams). The water table is high around the house with the moisture probably wicking into the concrete.

>>1 Was the concrete moisture tested prior to install?

No.

>>2 Did they allow proper expansion room at walls?

The crew that installed the sub floor did not leave expansion gaps between sheets or at the walls. The installers claimed that plywood is stable and not prone to expansion.

>>3 Do you have humidity issues in the house?

Not really. We live near the ocean in the SF Bay Area. Right now relative humidity is about 60% with temp in the room roughly 60 degrees. This is not optimal, but our other floor which is above grade does not have similar problems.

>>4 Since discovering the problem have you moisture tested the wood and plywood?

As I recall, moisture level in some of the boards is 14. They never got to the plywood layer to test moisture.


Many thanks for your ideas!

Paul
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Old 02-02-2008, 04:29 AM   #18
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moisture barrier issue: oak hardwood over concrete slab


hard to tell from FL, but you might try remove your baseboard..inspect for proper gap flooring to wall..create gap if needed... turn the heat up.. use space heaters if need be..give it three weeks of hot & cold. 1. this will drive moisture out & allow you to inspect gap for expansion and contraction.

what is the installer saying? This is under warranty I assume.
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Old 03-05-2008, 12:42 PM   #19
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moisture barrier issue: oak hardwood over concrete slab


I've been keeping my eye on this thread since the first post and was hoping to see the resolution on this issue.

I am by no means the be-all-king of experts on flooring installs but if any of my installers did this on a job here in Ohio, I would fire them and Home Depot would be refunding all your money and/or giving you a new floor.

I've always been taught and followed the rule of no true hardwood over a cement slab on or below grade, ever.

I hope you went back to these guys and got them to correct the mistake or re-install the floor.

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