The roof rafters are 2x8 on 16 centers with 2x10 ridges.
Splice roof rafters.
Rafter splicing is typically used as a last resort for erecting rafters and is not generally the preferred method of constructing roofs.
A 30 foot roof for instance will need at least two boards.
A splice should end between rafters not where a rafter lands directly on the splice.
How to splice a roof rafter plate.
A ridge board is a much better way to secure rafters to your roof and will almost always be a better way to go.
Several have a plywood scab brace on the side but several do not.
Pictured at left is a 2x6 rafter spliced together using 3 4 plywood.
A 16 foot board will end at a rafter with 24 inch spacing.
In this case the framer just needed a longer rafter.
Several roof rafters have been spliced in a v pattern near the roof ridge.
Rafter splice forgive the crude drawing will post pic but it is hard to see.
Measure rafter spacings of 24 inches with a tape measure and plan the splice to fall between rafters.
Calculate where a ridge beam splice will be needed.
Rafter plates are almost always spliced due to the length of most structures.
Rafter plates are load bearing beams that support either a single rafter or a truss.