With our roof pate in position we could then install the ridge beam, this was held into place by supporting posts fixed to the roof plate.
With our roof plate in place and held in position we are able to add our wall plate (two 2x4 that sit in the middle of the roof plate). The rafter’s birds mouth then sits snugly around the wall plate, preventing the rafter from slumping over time.
Using a scaffold tower on the temporary floor and a ladder at the roof plate we where able to lift our pre-made & pre-cut rafter into position. They did need a bit of tweaking, however most of the work had already been done at a safer level.
First we installed the gabel end rafters on either side, and then we filled in-between working our way across. This allowed the second half of the floor to go in simitaiously.
Rafters had the middle layer of OSB double or tripled up where they met the plum cut and the birds mouth. And where secured into position using corner brackets and special twisty nails.
Please note when working at height it is rather dangerous, and extra precautions should be taken.
- No-one should be working directly under you.
- People on the ground should have hard hats on.
- Harness should be worn (this was especially helpful on some Welsh windy days!).
This in not an exhaustive list, but more a guide. It is worth doing your own research and taking into account the dangers that are present on site, and can in fact be added. For example if someone is suspended from a fall arrest harness for an extended period of time, the risk of a hart attach increasing significantly at the point they are rescued from the harness.