Bird mouth or bracket on ledger board
6/21/2019 at 10:40:55 AM
I'm building one slope wood canopy over the windows of an old house. The canopy is 19' feet wide by 5 feet long and will be sitting on a 2-2x6 beam, which is sitting on 3-6X6 wood post.
The exterior wall is a full 14 inches structural brick wall, i will anchor a 2x6 ledger board to it.
My question, should my rafters sit on the ledger board with a bird mouth or should i use brackets? Why and what is the difference in therm of load distribution.
Pitch: 9:12
Thanks
6/21/2019 at 4:19:33 PM
Always a bird's mouth for me it is structurally stronger as the load is displaced down onto the beam and you are not replying on just a mechanical fixing to hold the rafters in place.
6/21/2019 at 4:28:37 PM
Always have the rafter sit against the ledger and use either hangers or pressure blocks this stops the rafters from being able to roll over.
6/22/2019 at 6:14:51 AM
Hi
If I read your drawing right. No birds mouth at the ledger, think half a roof and the ledger is the ridge. If you cut a birds mouth at that point you reduce the thickness of the rafter by the cut,not a good idea, you also have no edge to nail to presuming this is a closed roof not a pergola.
Hope this helped
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