New roof to old roof

[JStructsteel]

Covered deck roof to existing. Attached is my detail. Since trusses are not same spacing as rafters, was going to use a nailer board into the top of the trusses. To transfer the load down, 2x blocking at each truss to the bearing.

See any issues with this? Roof is about 15' out from the house, so not alot of load, 20 psf snow, wind load.

If I go higher up on the roof, what options would I have to reinforce the trusses without a major analysis/rework?

Thanks
[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1694265656/tips/Roof_Connection_9-8--23_bxpsyp.pdf[/url]

 

[Eng16080]

Seems like a good detail to me. The only potential weak point I can think of is if the 2x12 fastener plate is discontinuous halfway between two trusses and you also have a new 2x12 joist landing at that location. Adding a double 2x12 fastener plate with joints staggered would solve that, if it's an issue. Probably a minimal risk though.

I might also add another fastener plate exactly where the new and existing roof sheathing meet to ensure diaphragm shear transfer there.

 

[JStructsteel]

Thanks. Perhaps a note to splice at a truss.

good point on the diaphram, I will add some blocking or nailer at the intersection.

 

[DoubleStud]

If you go up higher, you still do the same thing but up the the roof is considered over framing. So you just have to put ripped rafters and blockings to avoid any huge point loads and distribute the new deadload as much as possible. It is like adding a cricket.