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04-23-2018, 08:30 PM
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#1
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Bus Nut
Join Date: Apr 2018
Posts: 421
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How far apart should sub floor wood strips be (with insulation in between)?
I’m coming up on installing my new floor. I plan on having 3/4” insulation, framed with 3/4” wood in a grid pattern, and covered with 3/4” plywood with a thin laminate on top of that.
But how far apart should wood for the grid be? I’ve seen 16” thrown around for wobble factors, but I also think less wood and more insulation would be better for heating and cooling.
Thoughts?
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04-23-2018, 08:32 PM
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#2
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Mine went down with no framing at all. 1 1/2" of XPS foam board with 5/8" ply on top.
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04-23-2018, 08:39 PM
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#3
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Bus Nut
Join Date: Apr 2018
Posts: 421
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Quote:
Originally Posted by Twigg
Mine went down with no framing at all. 1 1/2" of XPS foam board with 5/8" ply on top.
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Have you noticed any structural, aesthetic, or design issues that bother you?
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04-23-2018, 08:41 PM
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#4
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by TheArgobus
Have you noticed any structural, aesthetic, or design issues that bother you?
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No issues at all. I can't actually think why there should be. Floor is stable and firm.
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04-23-2018, 08:57 PM
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#5
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Bus Nut
Join Date: Apr 2018
Location: Wisconsin N.E.
Posts: 412
Year: 2000
Coachwork: Thomas
Chassis: Thomas
Engine: 5.9
Rated Cap: 72
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Yeah I was looking at your build wondering if that style would cause an issue with my almost 300lbs on it every day
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04-23-2018, 08:59 PM
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#6
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Bus Nut
Join Date: Apr 2018
Posts: 421
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Quote:
Originally Posted by Whatthefak
Yeah I was looking at your build wondering if that style would cause an issue with my almost 300lbs on it every day
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I feel you there, I’m 260 pounds myself.
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04-23-2018, 09:02 PM
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#7
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by Whatthefak
Yeah I was looking at your build wondering if that style would cause an issue with my almost 300lbs on it every day
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The compressive strength of the insulation is 25 lb per square inch.
That doesn't sound enormous but there are things going for you.
To start with, I weigh 180 lbs. Walking around on it in flat shoes, otherwise unprotected, did not put dents in the surface.
Then you cover it with 5/8" plywood which spreads the load over a much more substantial area.
Your 300 lb ain't gonna hurt it.
It's probably safe to assume that with all of your weight on one foot, the area carrying the load is at least 144 in sq ... Which means about 2 lb per square inch.
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04-23-2018, 09:21 PM
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#8
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Bus Nut
Join Date: Apr 2018
Location: Wisconsin N.E.
Posts: 412
Year: 2000
Coachwork: Thomas
Chassis: Thomas
Engine: 5.9
Rated Cap: 72
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Excellent info thanks man
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04-23-2018, 09:30 PM
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#9
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Bus Nut
Join Date: Apr 2018
Posts: 421
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I just looked up your build Twigg and found the pics of your floor, that looks real good. And with your post above, I think I will do the same. Thanks!
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04-23-2018, 09:37 PM
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#10
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by TheArgobus
I just looked up your build Twigg and found the pics of your floor, that looks real good. And with your post above, I think I will do the same. Thanks!
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I'm pretty happy with that floor. It should work well even in winter.
I have the advantage of the OEM plywood underneath it, and I screwed through into that layer. I need to add a few more screws but that won't take long. I don't so much want to screw it down, just stop the plywood bowing or moving.
If I didn't have that lower plywood layer I would have sparingly used TEK screws straight through the steel floor.
With flat plywood you might not even feel the need to do that. Mine wasn't flat.
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04-24-2018, 05:59 AM
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#11
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Bus Nut
Join Date: Dec 2017
Posts: 973
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Quote:
Originally Posted by TheArgobus
I’m coming up on installing my new floor. I plan on having 3/4” insulation, framed with 3/4” wood in a grid pattern, and covered with 3/4” plywood with a thin laminate on top of that.
But how far apart should wood for the grid be? I’ve seen 16” thrown around for wobble factors, but I also think less wood and more insulation would be better for heating and cooling.
Thoughts?
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We did a quickie/cheap remodel of a mobile home...we foamed boarded the floor...the only thing I'd do different is put framing to support the edges of the foam...they compressed, and we had to use floor leveling compound to fix that...no other issues
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04-24-2018, 12:52 PM
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#12
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Bus Nut
Join Date: Feb 2018
Location: Tahoe
Posts: 513
Year: 1997
Coachwork: International
Chassis: 3000RE
Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
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Quote:
Originally Posted by TheArgobus
I’m coming up on installing my new floor. I plan on having 3/4” insulation, framed with 3/4” wood in a grid pattern, and covered with 3/4” plywood with a thin laminate on top of that.
But how far apart should wood for the grid be? I’ve seen 16” thrown around for wobble factors, but I also think less wood and more insulation would be better for heating and cooling.
Thoughts?
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Skip the framing and make your life easier and you minimize heat transfer thru the wood which while much lower than metal is much higher than insulation.
__________________
middle aged mom on a learning adventure
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04-24-2018, 12:56 PM
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#13
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Bus Nut
Join Date: Feb 2018
Location: New Jersey
Posts: 335
Year: 2004
Coachwork: Corbeil
Chassis: Ford
Engine: Ford PowerStroke Diesel 6.0
Rated Cap: GVWR 11,500
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Quote:
Originally Posted by 2martins
Skip the framing and make your life easier and you minimize heat transfer thru the wood which while much lower than metal is much higher than insulation.
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I'd have to agree here. My plan is to only have a frame around the perimeter of our living area so we have a good attachment point for the ply and to prevent the edges of the foam board from getting compressed.
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04-24-2018, 04:57 PM
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#14
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by weboughtabus
I'd have to agree here. My plan is to only have a frame around the perimeter of our living area so we have a good attachment point for the ply and to prevent the edges of the foam board from getting compressed.
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You aren't going to be wlaking on the edges. The only exposed edges will be around the stairwell and it makes sense to frame there.
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04-24-2018, 05:02 PM
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#15
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Bus Nut
Join Date: Feb 2018
Location: Tahoe
Posts: 513
Year: 1997
Coachwork: International
Chassis: 3000RE
Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
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Quote:
Originally Posted by Twigg
You aren't going to be wlaking on the edges. The only exposed edges will be around the stairwell and it makes sense to frame there.
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Good idea.
__________________
middle aged mom on a learning adventure
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04-24-2018, 05:05 PM
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#16
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Bus Nut
Join Date: Feb 2018
Location: New Jersey
Posts: 335
Year: 2004
Coachwork: Corbeil
Chassis: Ford
Engine: Ford PowerStroke Diesel 6.0
Rated Cap: GVWR 11,500
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Quote:
Originally Posted by Twigg
You aren't going to be wlaking on the edges. The only exposed edges will be around the stairwell and it makes sense to frame there.
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That's true, but I will have cabinetry, the shower pan, etc. I was groomed from childhood to build things to be indestructible.
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04-24-2018, 05:18 PM
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#17
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by weboughtabus
That's true, but I will have cabinetry, the shower pan, etc. I was groomed from childhood to build things to be indestructible.
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I get that, but look at the numbers first.
If you have the base of a wall, let's say you make a shower wall from 2x4 lumber.
So you have around 34" by 3.5" as the bottom plate of the wall.
That's 119 sq in and it can take almost 3000 lbs of weight before it reaches the compressive strength of the foam.
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04-24-2018, 05:41 PM
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#18
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Bus Geek
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
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I wonder why so many are concerned with the compression rate of the foam board. Once it's covered with whatever wood flooring is going over it the compression rate of the foam becomes moot and now has the compression rate of the foam and the upper board. There's almost nothing you could mount in the bus at this point that is going to have any measurable effect on the foam underlayment.
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