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When sheathing gable-end truss, check plans to see if a vent opening is shown. • Toenail through bottom of truss into plate so gable end is on chalk line IV2" in from outer edge of double plate. (See below.) Step 3-Set Gable Ends Toenail 16d nails 24" O. C. to hold gable end while setting […]

Rafters that are not supported at the top or somewhere along the span by a beam create an outward force on the wall they rest on. This force is frequently offset by ceiling joists joining the walls on the opposite side of the roof. The chart below shows a common size of ceiling joist needed […]

Breaking the process of cutting rafters into the four basic characteristics described in this chapter helps to organize the task, but it is still a complicated process. Probably the best way to learn is to work through the steps in figuring individual rafters. The following illustration is an example of a roof that has a […]

There are calculators that are made specifically for assisting with construction math. These are very helpful in finding rafter lengths. Construction Master IV® is one available calculator, which we will refer to and use in this chapter to demonstrate the process of finding rafter® lengths. These calculators make it easy to do the complicated math, […]

Step 11-Install Sheathing

Set first jack rafter on 16” or 24" spacing with common rafters. Measure length from common rafter to first jack rafter and then use standard jack rafter differences, as given in framing square table, to measure lengths of remaining jack rafters along the hip rafter. 12 For 17 pitch Framing Square Segment Ф|||||П’Т[Ф ШГТІтїї JFTFjJ […]

For every 12" of common rafter run, there is 16.97" (17" approx.) of run for hip and valley rafters. Multiply the run in feet of the common rafter by 16.97" (17" is commonly used) to get the run of the hip or valley rafter. Adjustments for the Top and Bottom Cuts The cut mark will […]

The length of a rafter can be found by determining the horizontal length (run) that it covers, and the pitch of the roof. The constant relationship between these factors is defined as the diagonal percent. This percent is constant for any common or jack rafter on any roof that has the same pitch. To find […]

This method is probably the easiest to use. To find the lengths of rafters, you make an actual size drawing of the rafter on the floor and then measure the length. All the information you need to use this method should be on the plans. First you will need the pitch. (See Method C mentioned […]

When cutting rafters, you need to consider the following four factors: 1. The length: determined by two factors— distance spanned and slope. 2. The adjustment to the length at the top and bottom. The top and bottom adjustments can depend on a number of factors and are almost always a little different. The two main […]