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Spar Thickness
Posted:
Thu Feb 12, 2015 2:02 pmby Diemjoe
I was wondering how much trailer width affected the thickness of the Spars. I was thinking of glueing 2 pieces of 3/4 plywood That are 2 inches wide to match the insulation thickness. Trailer is just shy of 5' wide. Wall are 3/4" skeleton with 1/4" skins on both sides.
Re: Spar Thickness
Posted:
Thu Feb 12, 2015 3:44 pmby aggie79
I used single 1x2s on edge (1-1/2" x 3/4"). Spacing was 16" o.c. except at vent fan. I also double up the vent fan spars to allow "meat" for the fan fasteners. In the curves, the spar spacing was tighter.
Re: Spar Thickness
Posted:
Thu Feb 12, 2015 3:47 pmby Diemjoe
aggie79 wrote:I used single 1x2s on edge (1-1/2" x 3/4"). Spacing was 16" o.c. except at vent fan. I also double up the vent fan spars to allow "meat" for the fan fasteners. In the curves, the spar spacing was tighter.
What type of wood were your 1x2's?
Re: Spar Thickness
Posted:
Thu Feb 12, 2015 4:31 pmby angib
Diemjoe wrote:I was thinking of glueing 2 pieces of 3/4 plywood That are 2 inches wide to match the insulation thickness.
Remember that only half the plies in the plywood will run from one side to the other - the rest will run up and down and provide no extra strength. A decent 1x2 would be as strong.
Re: Spar Thickness
Posted:
Thu Feb 12, 2015 7:29 pmby Jdw2717
I ripped 2x4x8s in half to get the spars at 1.5"thickness for double foam isulation layers. Any water intrusion will not cause the weakness that delamination would bring if water ever got inside the structure. Install with any existing bow facing up. I believe plywood would be a little heavier also.
Re: Spar Thickness
Posted:
Thu Feb 12, 2015 7:54 pmby coyote
I to ripped 2x4s and used them. ( too long working on caterpillars, I put them every 8 inches front to galley, slight overkill I think) coyote
Re: Spar Thickness
Posted:
Thu Feb 12, 2015 11:59 pmby jonw
Poplar 1x2s on edge worked well for me
Re: Spar Thickness
Posted:
Fri Feb 13, 2015 9:31 amby aggie79
Diemjoe wrote:aggie79 wrote:I used single 1x2s on edge (1-1/2" x 3/4"). Spacing was 16" o.c. except at vent fan. I also double up the vent fan spars to allow "meat" for the fan fasteners. In the curves, the spar spacing was tighter.
What type of wood were your 1x2's?
Poplar. The big orange and blue box stores usually carry poplar. Pine will work too but you need to be careful with using screws. You can over-torque screws more easily in pine.
Re: Spar Thickness
Posted:
Fri Feb 13, 2015 10:21 amby Diemjoe
Thanks everyone. I am going to go out and get Poplar this weekend then.