Measuring Roof Rafters

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Measuring roof rafters.

Make a mark 3 4 to the side to give a guide for the edge of the 2 x 8. From here mark a line every 16 across the front lentil. Rafter run is the horizontal distance the rafter travels. The first number represent the amount in feet that a rafter rises.

The results are automatically fired. Here the number is 1166 66 inches. Decide how steep a slope you want your roof to have. Calculating rafter length 1.

On construction calculators slope is often called pitch. Measure the rafters begin by measuring across the front lentil and finding the center. Before you start cutting you first need to determine how long your roof rafters. 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.

Half building width minus 1 2 ridge thickness. The slope you choose will mostly be a matter of preference. On a full gable roof this is equal to half the building width minus half the ridge thickness. In our example we have a 7 12 roof 7 inches of rise for every foot of run.

Subtract the width of your ridge beam. Measure the length and width of the building. Measure the width of your building. Marking out the roof rafter lengths onto the timber before cutting step 1.

Allow for ridge thickness when determining rafter run to outer wall. Roof pitch is designated by a set of numbers such as 4 12 or 6 12. 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. With the tape measure hooked onto the top end transfer your two rafter lengths onto.

Determine the camber along the timbers length. Use a tape measure or laser measuring tool to find the dimensions of. Planning the dimensions of a new roof 1. See rafter run to outer wall calculator below.

Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. Determine the pitch of the roof which is the angle that rafters rise from the outside walls to the ridge. Mark the plumb cuts.

Here the number is 941 86 inches. Calculate the span of. The second number is the benchmark for typical pitched roof calculations. Before you can mark the rafter lengths and layout check the.