Joist Attachment Trusses For Patio Roof

If you decide on a shallow pitch porch roof use 2 by 6 foot rafters.

Joist attachment trusses for patio roof.

Use screws to secure the rafter to the sill plate. Attach 2x6 rafters to the house with joist hangers and or supported by the ledger board. With that in mind determine the space from end to end and space your trusses evenly. If necessary use a sliding bevel to determine angles needed where the rafters will meet the ledger board.

The lower the pitch the stronger the trusses joists have to be ie 2x8 may be required rather than 2x6 over a 17 foot distance. Trus joist tji joists are a key part of making a high performance floor. Rafters are placed on 24 centers and attached to the beams and settle joists are attached as needed image 1. The porch roof may match the pitch of your home or have a more shallow roof pitch.

Tji joists are lightweight and come in long lengths which makes them faster and easier to install than traditional framing and saves you both. Joist hangers can help you mount each rafter to the house. The dimensional stability of tji joists help them resist warping twisting and shrinking that can lead to squeaky floors. The positioning of your rafters will depend on the pitch of the porch roof.

This would involve probably 2x8 trusses set at 12 on center and the support beam made of 3 2x8s laminated together set at 12 from the house so the eaves overhang is about 24. Use bracing to keep the trusses in place as you work your way across. Locating and mounting the ledger is normally a fairly easy process. A house attached patio roof takes advantage of the house s structure by supporting one end of the roof on a ledger mounted horizontally to the house.

The general rule of thumb for truss installation is that you ll need to install one at least every 24. After attaching your truss make sure it is plumb before proceeding to the second one.