Jim Quade

How To Build a Round Roof Building

How To Build a Round Roof Building

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First you must decide what size of building you want, 28 – 48 feet wide and a length that is in 6 foot increments. The rafters are placed on 6 foot centers, with 2” x 4” purlins and steel siding/roofing. Let’s work with a forty foot wide foundation, easy to figure. The rafters are built out of 8 foot 1” x 8” boards. The number of 1x8s can be figured out by using the circumference. For a 40 foot wide building, figure a 40 foot diameter circle, which is 125.6 feet in circumference. Half of this circle would give you one layer of a rafter. So about 63 feet of 1×8 multiplied by 4 (because each rafter is composed of 4 layers). Each rafter then would use thirty-two 8 foot 1x8s. The end rafters really only need three layers.