bobhenry wrote:For some reason I added a 2x6 where the roof was almost dead flat , as a spar. It turned out to be a blessing as I installed a handicap bar. It helps in setting up and moving about and has allowed me to suspend heaters and fans overhead as a temporary mount. It was a happy accident that have proven time and again to be a great feature. (for what it's worth )
QueticoBill wrote:1*2 or 2*2 spars or 1 1/2" foam will barely support themselves I've 5'. The ply skins do all the work, with spars or foam simply keeping them acting together. Is it harder to get a foam tonpky bond than wood spar to ply? Probably. I just think it's worth it. Partly no thermal bridging but largely engineering "elegance". My comfort level with all foam core is based on a lot of experience with it in other applications (orchestra shells and portable platforms used in live entertainment). My problem is very little engineering data on less than 1/4" ply so 1/8" ply design is more instinct and guess.
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