Window Header Size Chart at Chart

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Window Header Size Chart. The trusses are spaced 24″oc and the walls are framed 16″oc. That is because the manufacturer adds half an inch to each of the size dimensions so the window can be installed with ease.

Advanced Framing: Insulated Headers | Building America Solution Center
Advanced Framing: Insulated Headers | Building America Solution Center from basc.pnnl.gov

Use two nails on each end and at splices. Many people will put plywood between the header pieces. Also, be aware double or triple jack studs may be required based on the opening width and the load the header carries.

Advanced Framing: Insulated Headers | Building America Solution Center

They are going in an exterior gable wall, framed with 2x6's. It has a double top wall plate. A 36″ door has a rough opening width of 38″ so your header is cut at 41″. The chart below shows common header sizes for different openings.