Have A 2x4 Running Perpendicular To Garage Roof Rafters

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Have a 2x4 running perpendicular to garage roof rafters.

Ceiling joists are 2x6 but 4 on center rafters are 2. I did some calculations lastnight and came up with 4 6 lbs psf. The builder tied the rafters together by running two 2x4 s perpendicular to the rafters about three feet from the top of the ridge board running the length of the roof. Hey guys i have a 16x24 shop ive built that needs a roof but im running low on cash i m wondering if 2x4 rafters with a 2x6 beam will be strong enough to hold a roof with 4 12 pitch asphalt shingles 7 16 osb and felt paper.

I do not have engineered trusses. It has an a frame roof. Would sistering 2x4 s in one 12 and two 8 sections all glued and screwed be enough to make it safe for storage. The span is 28.

I don t see this in what you posted. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are. It is possible the roof is supported by a structural beam instead of mere ridge board then you may not need the rafter ties. I am adding 3 4 plywood as the floor but also elevating the floor with 2x4 laid on their sides going perpendicular to the trusses.

I suppose i could add more but with the span across the garage they would have to be tied in to the rafters like the existing ones are which ultimately adds the load to the rafters still. The 2x4 perpindicular to the rafters is there to space the rafters or trusses apart prior to the roof being sheeting being installed. He also put a few braces from the joist to the rafters to keep the rafters from swaying.