Measuring 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.

Measuring roof rafters.

Marking out the roof rafter lengths onto the timber before cutting step 1. Measure the length and width of the building. See rafter run to outer wall calculator below. The ridge beam is the vertical piece of plywood which will form the peak of.

Use a tape measure or laser measuring tool to find the dimensions of. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. On construction calculators slope is often called pitch. Here the number is 941 86 inches.

Make a mark 3 4 to the side to give a guide for the edge of the 2 x 8. 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. Calculating rafter length 1. Determine the camber along the timbers length.

Roof pitch is designated by a set of numbers such as 4 12 or 6 12. 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. With the tape measure hooked onto the top end transfer your two rafter lengths onto.

Divide the adjusted width. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Before you can mark the rafter lengths and layout check the.

Measure the width of your building. Determine the pitch of the roof which is the angle that rafters rise from the outside walls to the ridge. The results are automatically fired. Calculate the span of.

Rafter run is the horizontal distance the rafter travels. Measure the rafters begin by measuring across the front lentil and finding the center. Mark the plumb cuts. The second number is the benchmark for typical pitched roof calculations.

Half building width minus 1 2 ridge thickness. Here the number is 1166 66 inches. In our example we have a 7 12 roof 7 inches of rise for every foot of run. Allow for ridge thickness when determining rafter run to outer wall.

Before you start cutting you first need to determine how long your roof rafters. From here mark a line every 16 across the front lentil. The first number represent the amount in feet that a rafter rises. Planning the dimensions of a new roof 1.