Plywood with Stitching?

Boris

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Jul 13, 2015, 6:12:47 PM7/13/15

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Hi,

We're remodeling and the old flooring (lino and carpeting) has been taken
up to install hardwood. I noticed many of the 4'x 8' x 3/16" underlayment
plywood has lines of stitching. Yes, stitching, which goes through to both
sides, and is made of nylon or cotton multi-strand thread.

What is this? I've never seen it before.

TIA

TimR

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Jul 13, 2015, 7:44:44 PM7/13/15

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Very common in boatbuilding to stitch plywood then epoxy over, but I've not seen it on a floor.

cl...@snyder.on.ca

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Jul 13, 2015, 8:56:09 PM7/13/15

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On Mon, 13 Jul 2015 16:44:40 -0700 (PDT), TimR <timot...@aol.com>
wrote:

I've never seen plywood underlayment stitched, but "fingerjointed
hardwood "or "fingerjointed parquet" is often stitched with nylon
cord.

micky

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Jul 14, 2015, 12:54:08 AM7/14/15

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On Mon, 13 Jul 2015 20:55:44 -0400, cl...@snyder.on.ca wrote:

>On Mon, 13 Jul 2015 16:44:40 -0700 (PDT), TimR <timot...@aol.com>
>wrote:
>
>>On Monday, July 13, 2015 at 6:12:47 PM UTC-4, Boris wrote:
>>> Hi,
>>>
>>> We're remodeling and the old flooring (lino and carpeting) has been taken
>>> up to install hardwood. I noticed many of the 4'x 8' x 3/16" underlayment
>>> plywood has lines of stitching. Yes, stitching, which goes through to both
>>> sides, and is made of nylon or cotton multi-strand thread.
>>>
>>> What is this? I've never seen it before.
>>>
>>> TIA
>>
>>Very common in boatbuilding to stitch plywood then epoxy over, but I've not seen it on a floor.

What's the purpose of this? Doesn't the glue hold it together.

> I've never seen plywood underlayment stitched, but "fingerjointed
>hardwood "or "fingerjointed parquet" is often stitched with nylon
>cord.

Same question?

cl...@snyder.on.ca

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Jul 14, 2015, 12:23:55 PM7/14/15

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On Tue, 14 Jul 2015 00:54:03 -0400, micky <NONONO...@bigfoot.com>

Does "self jigging" ring any bells???

micky

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Jul 14, 2015, 5:43:33 PM7/14/15

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No but I looked it up. Was the stitching put in before the glue set?

cl...@snyder.on.ca

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Jul 14, 2015, 6:40:56 PM7/14/15

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On Tue, 14 Jul 2015 17:43:23 -0400, micky <NONONO...@bigfoot.com>

In the fingerjoint flooring and in boat building - most definitely.
In boat building, the whole boat gets stitched together before any
gluing/resin application .
The stitching holds everything in position for gluing AND it
re-enforces the glue joint.

micky

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Jul 15, 2015, 5:41:48 AM7/15/15

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Very interesting. It's a good thing I learned this before I built my
boat.

dsda...@hotmail.com

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Nov 11, 2017, 8:53:50 AM11/11/17

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I found this thread by looking for the answer to the question and I still don't have it. I'm in Barrow, Alaska doing some fire restoration on a building and found that the ceiling of the building was sheeted with 1/2" plywood that has nylon stitching, prior to the sheet rock going up. Very curious.

Jeremy

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Jan 10, 2020, 10:44:07 AM1/10/20

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replying to dsdarryl, Jeremy wrote:
Same here for me only the plywood with stitches in it is located underneath
a bathtub we removed in a house we are remodeling... very curious. Did you
ever wind up figuring this out?

--
for full context, visit https://www.homeownershub.com/maintenance/plywood-with-stitching-838253-.htm

Kyle collier

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Feb 4, 2020, 10:44:06 PM2/4/20

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replying to Boris, Kyle collier wrote:
Like this, not a boat
https://www.homeownershub.com/img/li
https://www.homeownershub.com/img/lj