Foamies roof Design

[leblanda]

Hi Guys,

I looked at many big foamies and woodies.
My multiporpuse pod will be 6 width x6 height x12 long. Here in Canada we have a lot of snow some season.
I always see the roof spar notched in the side and have the foam over the spar.
Would it be a good idea to build the roof with the spar glued to the side of the roof foam?
Like 2" spar + 2" foam (24 " x 72") + spar + foam + spar , etc

thanks

 

[leblanda]

I just find that one.

Foamie roof ? snow load

My Foamie will be stored outside :( . And we get our fair share of snow Northeast Ohio. My Foamie ttt will be about 76" wide (exterior)/72"wide interior using 2" foam. Any information about supporting the roof would be helpful. I've seen people adding stringers. Would pine be OK ?. Also what...

www.tnttt.com

 

[CanuckShooter]

Mine is 7x14, I used 1x3 then 1/8" thin ply then glued 1 1/2 styrofoam over that with PMF covering. I'm in Canada and it lives outside all winter with no issues. I just butted the roof spars to the wedge shaped 2x6 I used to slope the roof and put long screws in to hold them in place.

If you search the foamies forum you should be able to find my build thread.

 

[dt400]

I have a 5' x 7' flat roof on my glass foamie. I was concerned about roof sag but didn't want to design and build some complicated triangulated/arched roof structure.
I used 12 oz glass fabric (varying amount of layers depending on location) and low viscosity epoxy resin. The inside and outside where built using using a method that provided one solid shell all chemically boned to be as strong as possible
I tried a few ideas and settled on strips of 3/8" Baltic Birch 1" tall and 58" long (still bears over the wall but doesn't extend to the outside) as the base for the joists spaced 12-14" apart in a groove routed in the inside of the roof. The joist is placed with the 1" in the vertical position not flat. I built the roof panel upside down so the inside faces up when doing to work before the pod was assembled. The joist is wrapped with carbon fiber (spry contact adhesive helped immensely here and the epoxy dissolves the glue as it impregnated the carbon) and placed in the groove with a decent amount of epoxy already in it (the carbon fiber is still just fabric wrapped around the Birch and not impregnated with epoxy before being placed in the groove). Let the epoxy soak into the carbon fiber and keep filling the groove with epoxy to keep it level with the surface of the foam. You don't want a overly large groove, just enough to fit the joist and be barely below flush. Then a layed down one layer of glass covering the inside of the roof almost to where the sidewall and it would be bonded together. Later once all assembled there would be another layer of glass over the already layed piece that would be done with the walls and interior floor to give me a monocoque type structure.
This gave me a roof structure of the carbon fiber, Baltic Birch and the roof foam to be as close to one chemically bonded structure as I could do.

Darrell

 

[ghcoe]

Building a slight curve in the roof will add a lot of strength.