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[GMCnet] GMC Plywood floor thickness. [message #289535]

Tue, 27 October 2015 13:44

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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Are they all one inch marine plywood. Or are some years 3/4 inch.Bob Dunahugh
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Re: [GMCnet] GMC Plywood floor thickness. [message #289538 is a reply to message #289535]

Tue, 27 October 2015 15:18

sgltrac

Messages: 2797
Registered: April 2011

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Later model coaches are 3/4 in the main living area and a thicker laminated
sandwich in the cockpit.

Sully
77 royale
Seattle

On Tuesday, October 27, 2015, Bob Dunahugh wrote:

> Are they all one inch marine plywood. Or are some years 3/4 inch.Bob
> Dunahugh
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Sully 77 Royale basket case. Future motorhome land speed record holder(bucket list) Seattle, Wa.

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Re: [GMCnet] GMC Plywood floor thickness. [message #289539 is a reply to message #289535]

Tue, 27 October 2015 15:38

rcjordan

Messages: 1913
Registered: October 2012
Location: Elizabeth City, North Car...

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Keep in mind that modern plywood has been converted to 'nominal' sizing --which translates to "they've shaved a couple of mm off of it but still call it 3/4." In the building trades, a sheet off tar paper is required to level a butt joint between old and new.

SOLD 77 Royale Coachmen Side Dry Bath
76 Birchaven Coachmen Side Wet Bath
76 Eleganza
Elizabeth City, NC

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Re: [GMCnet] GMC Plywood floor thickness. [message #289541 is a reply to message #289535]

Tue, 27 October 2015 16:36

jricke

Messages: 29
Registered: June 2007
Location: Arden Hills, MN

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Bob,

I replace my cockpit floor with 2 layers of Menards 1/2" (it is a true 1/2" thick) Marine plywood bonded together with a liberal amount of Titebond adhesive. I clamped the plywood with short sheetrock screws while adhesive cured.

Used the original pieces as a guide to then create the various channels and edges with a dado blade and table saw. I believe there were three different depths involved. Coated with some polyurethane I had on the shelf and attached to aluminum members with pop rivets and washers.

Nice feeling to have a solid floor under us (wife was a bit 'surprised' when showed her I could poke my finger through floor she was sitting on!)

Joe

Joe Ricke - KE0CPM
Arden Hills, MN
'77 Transmode

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Re: [GMCnet] GMC Plywood floor thickness. [message #289549 is a reply to message #289535]

Tue, 27 October 2015 18:27

Jp Benson

Messages: 649
Registered: October 2011
Location: Fla

Karma: 2

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BobDunahugh wrote on Tue, 27 October 2015 13:44

Are they all one inch marine plywood. Or are some years 3/4 inch.

My coach is a 76 Royale.
The cockpit & step used 1".

I replaced the original 3/4" cabin floor:
http://www.gmcmhphotos.com/photos/restoration-photos/p55075-original-floor-5-ply-3-2f4-26quot-3b.html

With this:
http://www.gmcmhphotos.com/photos/restoration-photos/p55076-replacement-floor-7-ply-23-2f32-26quot-3b.html

The supplier called it "boat ply".

JP

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[GMCnet] FW: GMC Plywood floor thickness. [message #289556 is a reply to message #289535]

Tue, 27 October 2015 19:58

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Well. That answered that question. The floor under the passenger seat was in bad shape. So I went and bought a sheet of 3/4 marine plywood. As I thought that was what was used in the 78's. ( Everywhere ) $79 a sheet. Started making the floor panel. Surprise. Surprise. Now to plan B.Thanks for the info.
Bob Dunahugh
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