LVLs come in 24′, 28′, 30′ and 32′ standard lengths. LVL is VERY expensive, but solves the limitation of 20 feet, in a common pine board. If you need rafters that are 20′ 1″ or longer, you will need an LVL (Laminated Veneer Lumber) engineered rafter board, which is this yellow color plywood-like board made for structural purposes. ![]() Rafters LONGER than 20 feet: Home improvement stores DO NOT sell pine boards longer than 20 feet. Lumber size/ width (2×8″, 2×10″ or 2×12″ boards) will be used to estimate cost of each rafter, as well as total cost (excluding local sales tax). Rafter spacing (and roof length) will be used to determine quantity of rafters needed for your project. If your roof pitch is in degrees, use our roof pitch calc to convert degrees to “pitch” value. Example: If your roof rises 5″ for every 12″ of run, enter 5 as roof pitch. Enter desired overhang length – this will affect your rafter length and lumber needed for the job.ģ) Enter roof pitch / slope: Roof pitch is the value of roof rise over roof run, using 12 as the base for roof run. Width or Span is the gable side of the roof, which is used in calculating rafter length and cost.Ģ) Enter overhang length: Most houses have overhangs (soffits) which are needed to protect the house exterior walls and foundation from water run-off from the roof. It is excellent for framers, builder, contractors, GC’s and architects and will be helpful in planning new construction projects.ġ) Enter house footprint: Length is the roof eave ( gutter) side. ![]() Use the diagram on the right to correctly enter your roof dimensions – this will help you calculate board length more accurately.
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