Roof Rafters

We attached the greenhouse rafters to the garage rafters, following the same layout, which was on two foot centers. We attached a ledger beneath the greenhouse rafters for added support. The greenhouse rafters ran from the garage to the main beam of the greenhouse at a 20 degree angle, which was the same angle of the garage roof. We used redwood 2x6's for these rafters, most of which were reclaimed from a old deck. From observations and from figuring sun angles at different times of the year, we decided to cover the first two feet of the roof, closest to the garage with roofing instead of polycarbonate. This would offer some shading from the hot summer sun while allowing a maximum of the winder sun. These two feet could also be insulated for added efficiency.