Measuring Roof Rafters

In our example we have a 7 12 roof 7 inches of rise for every foot of run.

Measuring roof rafters.

Determine the camber along the timbers length. Measure the rafters begin by measuring across the front lentil and finding the center. Decide how steep a slope you want your roof to have. Divide the adjusted width.

The results are automatically fired. Before you can mark the rafter lengths and layout check the. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. See rafter run to outer wall calculator below.

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. Calculating rafter length 1. Use a tape measure or laser measuring tool to find the dimensions of. On a full gable roof this is equal to half the building width minus half the ridge thickness.

Here the number is 941 86 inches. Marking out the roof rafter lengths onto the timber before cutting step 1. Roof pitch is designated by a set of numbers such as 4 12 or 6 12. The first number represent the amount in feet that a rafter rises.

Determine the pitch of the roof which is the angle that rafters rise from the outside walls to the ridge. Allow for ridge thickness when determining rafter run to outer wall. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Calculate the span of.

Half building width minus 1 2 ridge thickness. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Measure the width of your building. Planning the dimensions of a new roof 1.

With the tape measure hooked onto the top end transfer your two rafter lengths onto. Rafter run is the horizontal distance the rafter travels. From here mark a line every 16 across the front lentil. On construction calculators slope is often called pitch.

Before you start cutting you first need to determine how long your roof rafters. Measure the length and width of the building. Make a mark 3 4 to the side to give a guide for the edge of the 2 x 8. Subtract the width of your ridge beam.

Mark the plumb cuts. 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. The ridge beam is the vertical piece of plywood which will form the peak of. Here the number is 1166 66 inches.