How To Extend Roof Rafters

Measure the width of the ridge beam.

How to extend roof rafters.

If the existing rafters have bird s mouth cuts where they sit on the exterior wall plate use. You could simply support it on the existing wall and install it without a splice. Follow safe working procedure falling. The two rafters would not have to line up but that would be simpler for installation.

If the main rafter is only sticking out a short distance i e. How to increase rafters for insulation step 1. The ridge beam is the vertical piece of plywood which will form the peak of the gable and to which you ll fasten the rafters on either sides. Attach 1 2 inch wood cleats to both sides of the existing rafter.

At the beam end the rafters are fastened with a 10 inch structural screw through the top of the rafter into the beam. To get a visual idea of what the new overhang will look like take a photo of the house from. These rafters require extra measurement to mesh the hip gable to the ridge beam properly. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers.

You need to get up to the area that you are going to extend. How to extend rafters determining rafter length. 1 or 2 ft. Set up scaffolding.

Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. Remove the drip edge and the facia trim. Secure each tile with two large head roofing nails. The roof deck is 1x6 attached to the top of the rafters with 1 4 inch space between boards.

The blocking is held low to hide the roof wall intersection and to provide a 1 inch air space at the top for a ventilation channel. Subtract the width of your ridge beam. Then this is not an extension to the rafter but a separate rafter. Double the tiles at eaves and project them 1 inch over the rear edge of gutters.

If you re using a 2x4 it ll measure 1 5 inches 3 8 cm. Figure the rafter depth needed to provide the desired r value. For instance if the roof has 2 by 6 rafters and. Use cleats the same length as the width of the.