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Old 06-14-2018, 05:24 PM   #1
karrlot's Avatar
Join Date: Jul 2015
Location: Manitou Springs, CO
Posts: 186
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.
Please check out my blog-
Follow the (lack of) progress on the Karr Family Kamping Bus Blog
Here is my woefully inadequate build thread:
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