But you have to do it before you build the walls.
How to attach shed roof to walls.
Leave this doorway open.
Cover the walls with board and batten 4 by 8 foot sheets of plywood nailed vertically to the sheathing strips with the seams covered by 1 by 4 inch batten boards.
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.
The ledger board in this case is essentially.
Seal the top with clear caulk.
When a shed roof intersects a wall a ledger board attached to the wall serves as a nailing surface for the ends of the rafters at their upper ends.
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Your shed walls are going to attach in two main ways.
Frame a wide doorway by bracing the shed roof temporarily and cutting studs with a reciprocal saw.
Build a real addition by removing the siding from the shed and building new walls.
Fit rafter board into the u shaped hangers and nail it in place.
Toenail a truss into the top of the wall plate by nailing through the sides of the bottom chord at a 30 degree angle.
Install shed rafters from the ledger board to the outer wall using metal rafter hangers which attach to the ledger board with screws or nails.
Then use the chalk lines as a guide for cutting the truss patterns and assembling the trusses.
As with rafter style roofs toenailing is one of the most common ways of attaching a truss style roof to a wall plate.
When securing your walls to the floor you will nail or screw through the bottom plate of your wall and directly into the floor joists.
Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof.
The best method is to snap chalk lines on the shed floor to outline the truss parts.
If you re building your own roof trusses the handiest place to assemble them is right on the shed floor.
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.