http://www.roofcalc.org/roof-rafter-calculator/ Calculate Roof Rafters – cost, length and quantity.
Excellent tool for builders / framers / roofers to calculate roof rafter length, cost and number of rafters needed for the job. Estimates cost of pine board and LVL boards (for rafters longer than 20 feet)
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Hip + Gable Roof Framing Calculator Free online – http://www.blocklayer.com/roof/roofeng.aspx – Hips, Ridge, Common Rafters, Jacks – Full Roof Framing Plans online