How To Extend Flat Roof Joists

This demo version is fixed at 1m clear span.

How to extend flat roof joists.

1 enter joist details 1 1 span and joist spacing. Measure and cut 2 by 4 joists to span the distance between each set of joist hangers. Overhang flat roof timber joists. Repeat the process at both ends of each joist.

You will likely have a budget for the project and in this case learning that a flat roof generally costs less than a pitched roof will be good news. I cant extend these 2 steel beams as they are below the joists level. Flat roof extension cost. This is because a flat roof requires less structural engineering and can utilize less expensive materials than the pitched variety.

If attaching a patio roof to a ledger beneath the eaves does not allow for enough headroom you can set the new patio roof s rafters on the wall s top plate. If you want to extend the rafters farther to cover a walkway or a porch. Use your power drill to make pilot holes through the hangers and into the joist. Drive screws into each pilot hole to fasten the joists in place.

The full version allows any size. Flat roof joist calculator. On a two story house you can usually tie the ledger into a band joist also called a rim joist located between the floors as shown below. Usually 400 450 or 600mm but any value can be used up to 610mm max.

I am thinking to tackle it as follow the deflection is within the acceptable limit with this layout.