Help TD engineers.....roof spars question (six wide TTT)

[Woodstramp]

Ok...I'm to the point in my build where I've got to figure in roof spars. Never having built anything like a small camper I'm basically clueless as to how wide/thick these will need to be.

This camper will be 6' wide. the roof will have 1/4"paneling inside, 1/4" luan outside. I'm using spruce lumber. Would 1 1/2"x 2" be strong enough for that span?

[doug hodder]

More than enough, in my opinion....I do 1.5" insulated roofs on a tear and use 3/4x 1.5 on them...If it has a trolley top....I only go 3/4 sq. thick on the lifted portion. Just make sure you block it out well where you want, or if you want a ceiling fan to attach it to. Doug

PS...you could do 1/8 on the interior...it's plenty...I've done both and the 1/8...it's much easier.

[Woodstramp]

Doug,

You're the fellow who built that cool little blue 50's looking stand up camper. My hat is off to you on that one...1 1/2" x 2"spars it will be. Thanks.

As to the luan....all that the local building joints (Lowes, HD) have is 1/4" thick, so I have to make that work. Plus I had originally wanted to skin this thing with 36" wide strip of aluminum, but the suplier told me the other day that this is no longer available. I have to skin it another way.....thinking now that I want to Rhino line the whole thing. 1/4" would be a stronger base for that. Probably will route grooves on the back side 1/4" to make it bend. We'll see.

I've decked the the 6'x10' frame I built this winter and started in on the base fo the walls. Got a homemade door jam and decent factory windows. The only thing that is scaring me is the roof transition and I want to get it right.

Never saw a roof on here like that the one in the pic. Is that one you built in the past or is that something you're doing now?