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Subfloor: Adding 1/8" Gap After Install

 
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Old 03-10-2019, 09:40 PM   #1
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Subfloor: Adding 1/8" Gap After Install


I've got a tile job where a 0.75" OSB subfloor was laid 3 years ago on top of 100 year old joists. Whoever did the job added new joists to help support the larger spans.

The subfloor was laid without 1/8" gapping between panels opposite the tongue and grove; nor does it appear any gap was left along the tongue and grove.

Given that the OSB has been nailed in and adjusted to the climate for 3 years, it is necessary -- or even helpful -- to cut in the 1/8" gap now? How about the T&G side: Is it better to destroy the T&G by cutting in a 1/8" gap?

In some places the seam is under the wall and may be hard to reach.

Thanks

Steve
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Old 03-10-2019, 10:11 PM   #2
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Re: Subfloor: Adding 1/8" Gap After Install


For real? Cut out the tongue & grove? Have you ever had T&G subfloor fit together & looked at it from the end, the cross section?

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Old 03-10-2019, 10:46 PM   #3
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Re: Subfloor: Adding 1/8" Gap After Install


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Old 03-11-2019, 02:19 AM   #4
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Re: Subfloor: Adding 1/8" Gap After Install


Don't cut it up.
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Old 03-11-2019, 07:05 AM   #5
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Re: Subfloor: Adding 1/8" Gap After Install


Cut it up.
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Old 03-13-2019, 08:05 PM   #6
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Re: Subfloor: Adding 1/8" Gap After Install


The T&G is slammed together, the built in gap on the surfaces isn't there any longer.

I hear leave it, and I hear cut it up -- any justification?

thanks
Steve
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Old 03-13-2019, 08:27 PM   #7
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Re: Subfloor: Adding 1/8" Gap After Install


Quote:
Originally Posted by 1900farmhouse View Post
The T&G is slammed together, the built in gap on the surfaces isn't there any longer.

I hear leave it, and I hear cut it up -- any justification?

thanks
Steve
What's the problem? Been acclimated for 3 years, What's the issue you want to avoid or existing issue-problem effecting tile install. Beyond over thinking this.

How do you know it wasn't gapped 1/8" and just expanded swelled after?
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Old 03-13-2019, 08:33 PM   #8
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Re: Subfloor: Adding 1/8" Gap After Install


I'd go to a hardware store and ask for 100 linear feet of 1/8" gap.

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Old 03-14-2019, 09:20 PM   #9
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Re: Subfloor: Adding 1/8" Gap After Install


Quote:
Originally Posted by 1900farmhouse View Post
The T&G is slammed together, the built in gap on the surfaces isn't there any longer.

I hear leave it, and I hear cut it up -- any justification?

thanks
Steve


If it is slammed together you should definitely cut it up
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Old 03-16-2019, 09:48 AM   #10
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Re: Subfloor: Adding 1/8" Gap After Install


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If it is slammed together you should definitely cut it up
over slammed t and g?

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Old 03-16-2019, 10:47 AM   #11
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Re: Subfloor: Adding 1/8" Gap After Install


This should be thread of the year.

Read the manufacturer's instructions, most is made where the T&G is self spacing and it meant to be rammed together, the 1/8" gap is for the 4' side of the boards.

If it's been there for 3 years and looks fine do you really thing it's worth cutting it up?
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Old 03-16-2019, 12:51 PM   #12
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Re: Subfloor: Adding 1/8" Gap After Install


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If it's been there for 3 years and looks fine do you really thing it's worth cutting it up?


Yep
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Old 03-17-2019, 07:25 PM   #13
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Re: Subfloor: Adding 1/8" Gap After Install


Put a straight edge on the gaps to check for swelling. If there’s any, rent a drum sander and go to town. Gap or not you can still get edge swell.

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