Over the past few weeks I have been working on the roof.
On the crossing joists (2 x 2) i have added a 1/8 inch strip on top of them in the center of the roof area only. My thinking is that I will slightly bend and slope the roof to the edges to prevent any excess water sitting on the roof.
Next I glued up two full sheets of xps foam and a couple of the spare pieces to make up the entire roof structure. The edges were also all cut at a 70 degree angle to match the angle of the walls.
While building the roof structure the biggest worry is will the foam and existing roof joists be enough to hold up against snow loading. I live in Canada and it will be stored outside so the snow could get quite heavy.
To help with the overall rigidity of the roof, I decided to cut some hardwood strips and then router the foam to house the strips.
The strips were then glued into the routed foam for added rigidity.
Now we shall see if the expansion of the glue pushes the strips out when it dries.
Attached is a quick video showing the embedded strips in the XPS foam with all the clamps to holding contain the strips within the routed piece while the glue dries.
If you wondering why the strips do not run the full length of the roof. The of the roof sits a little higher than the outsides so the plan is to slightly bend the foam and glue it in place to help with the rain running off. This is why I kept the strips only as long as the second last ceiling joists to allow for a bit of bend.
Not sure if this all makes sense, but maybe the video will help.
Next step is possibly adding one or two more embedded spars in the middle if need be.
Then I will cut the hole for the roof fan and finally cover the underside of the roof with canvas while it is easy to get at rather than holding up my arms for hours while inside the unit.
After this I will glue the roof on and fill any cracks....then its outside canvas time.....
We will see how that goes.
Video Link Below:
https://youtu.be/_EyGCieX_ng