Measuring Roof Rafters

The ridge beam is the vertical piece of plywood which will form the peak of.

Measuring roof rafters. Rafter run is the horizontal distance the rafter travels. Calculate the span of. From here mark a line every 16 across the front lentil. Here the number is 1166 66 inches.

On construction calculators slope is often called pitch. Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width selecting a pitch for the roof and the thickness of the ridge. Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall. Measure the rafters begin by measuring across the front lentil and finding the center.

The first number represent the amount in feet that a rafter rises. On a full gable roof this is equal to half the building width minus half the ridge thickness. Subtract the width of your ridge beam. Make a mark 3 4 to the side to give a guide for the edge of the 2 x 8.

The slope you choose will mostly be a matter of preference. Determine the camber along the timbers length. Divide the adjusted width. Measure the width of your building.

Calculating rafter length 1. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Decide how steep a slope you want your roof to have. See rafter run to outer wall calculator below.

Here the number is 941 86 inches. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Marking out the roof rafter lengths onto the timber before cutting step 1. Mark the plumb cuts.

The results are automatically fired. Before you start cutting you first need to determine how long your roof rafters. Measure the length and width of the building. Determine the pitch of the roof which is the angle that rafters rise from the outside walls to the ridge.

Roof pitch is designated by a set of numbers such as 4 12 or 6 12. Planning the dimensions of a new roof 1. Use a tape measure or laser measuring tool to find the dimensions of. With the tape measure hooked onto the top end transfer your two rafter lengths onto.

The second number is the benchmark for typical pitched roof calculations. Before you can mark the rafter lengths and layout check the. Allow for ridge thickness when determining rafter run to outer wall. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak.