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Old 06-14-2018, 05:24 PM   #1
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Join Date: Jul 2015
Location: Manitou Springs, CO
Posts: 213
Year: 1991
Coachwork: Ward
Chassis: International 3800
Engine: DT466
Rated Cap: 65 passenger
Planning access through the subfloor

I am going to be installing my subfloor soon. I have osphoed, cut rust, painted the floor with rustoleum.

My tentative plan for a floating floor:

1) Put down red rosin paper.
2) Layout 2x4s on the edges and where the plywood seams will be.
3) Put 1 1/2" pink insulation board between the 2 x 4's.
4) Put down 1/2" plywood using liquid nails to attach it to the 2x 4s.

Here are my questions:

Is 1/2" plywood thick enough?

Do I need to put more 2x4s to support the floor or is it adequate to just have them at the edges of the plywood?

Do I need to frame 2 x 4s around the holes for toilet flange (going to a black tank under the bus), shower drain, and the fuel sending unit so the edge of the plywood is supported?

Do I need to have all of my cabinets, bunks, couch planned and put 2x4s under the plywood so they have adequate support?

Can I mount my passenger seats (which are still unknown) through the plywood and insulation and have them bolted into the metal floor or do I have to have them planned before I put down my subfloor?

TIA for any help.
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Old 07-10-2018, 12:32 AM   #2
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Join Date: Feb 2018
Location: Tahoe
Posts: 511
Year: 1997
Coachwork: International
Chassis: 3000RE
Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
Quote:
Originally Posted by karrlot View Post
I am going to be installing my subfloor soon. I have osphoed, cut rust, painted the floor with rustoleum.

My tentative plan for a floating floor:

1) Put down red rosin paper.
2) Layout 2x4s on the edges and where the plywood seams will be.
3) Put 1 1/2" pink insulation board between the 2 x 4's.
4) Put down 1/2" plywood using liquid nails to attach it to the 2x 4s.

Here are my questions:

Is 1/2" plywood thick enough?

Do I need to put more 2x4s to support the floor or is it adequate to just have them at the edges of the plywood?

Do I need to frame 2 x 4s around the holes for toilet flange (going to a black tank under the bus), shower drain, and the fuel sending unit so the edge of the plywood is supported?

Do I need to have all of my cabinets, bunks, couch planned and put 2x4s under the plywood so they have adequate support?

Can I mount my passenger seats (which are still unknown) through the plywood and insulation and have them bolted into the metal floor or do I have to have them planned before I put down my subfloor?

TIA for any help.
You don't need any 24s at all. I have 2" rigid foam with 1/2" plywood. Other people use 1" foam and 3/4 plywood. It is good. Even stopped the oil canning that was happening when we walked a couple of places in the bus and it's not even glued down.
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