If you want a diy flat roof here are the steps to follow.
Roof construction steps.
Each one focuses on the necessity of integrating every layer of the roof into one comprehensive roofing system capable of withstanding the natural elements.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
The rise or height of the roof at its peak is the altitude of the triangle.
The roof and truss design should be approved by your local building department before beginning any construction work.
Use 1 2 in 1 3 cm plywood to cover the entire surface of your roof.
Hoist the trusses onto the roof.
The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.
Place a piece of the plywood on the bottom corner of your roof making sure the edges are on a rafter beam.
Proper steps to shingle a house roof.
This can be done either with many pairs of hands or with the assistance of a crane.
The run or half the building span is the base of the triangle.
Remove the old roof.
Use construction nails 6 in 15 cm apart to secure the plywood around the outer perimeter and along each support.
Below is an easy to follow manual for building flat roofs including a guide to flat roof framing and installation with plenty of details and specifications about the frame.
To complete this step the wall frames of the building must already be level plumb and square.
Put roof sheathing on top of your roof.
Step 2 lift all the trusses onto the top of the walls by lifting one end at a time using ladders and then slide one truss into position at one end of the building.
Use ladders or scaffolding if you are building the roof onto a building that is still a frame.