Bay Window Roof Framing

A projection with four or more angled faces is a bow and cannot be calculated with easy rafters.

Bay window roof framing.

To build a roof cab construct a wood frame out of 2 by 4 ft 0 61 by 1 22 m boards that matches the base of your bay window s roof and mirrors the shape at a 90 degree angle on your wall. It s wrong and just plain ugly. The starting pitch is 3 12 and the ending pitch is 16 12. Drawing bay roofs out full scale is key to fast and accurate framing.

First the instructions to find the ridge length is wrong. Framing a bay window roof it s only a small hip roof but its 45 degree corners befuddle many carpenters. It s time to finish planning the roof frame. It looks like diy built the bay window roof.

Bay roof a bay roof is a three sided roof framed against a vertical wall of a building usually covering a projection from the building such as a bay window or breakfast nook. Before you get started with the roof the bay window itself needs to be in place. But once the window its frame and its cap are in place you can get started framing the roof. Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.

Roof framer s bible framing a bay window roof page 206 does not follow the holly grail of roof framing trigonometry and geometry. This bay window rafter script will print out a chart of all rafter lengths and angles for the baywindow. We asked one of our veteran builders to show us how it s done. You ll also have to plan for the bay window roof.

The secret to a good looking roof is having the right proportions. Then miter 4 joists at a 45 degree angle on both sides and install them around the exterior opening of the frame to reinforce it. Plan out the roof. Unlike a traditional hip roof the roof over a bay window with 45 degree sides is based on an octagonal roof but most people don t know how to frame an octagonal roof.

Auto generated rafter tables for equal pitch bay window roof with 45 wall angles. Plan carefully consulting with the architectural plans before commencing work. Framing a hipped roof for a bay window is harder than it looks. Step 1 plan and install the bay window.

Do not use this method to framing bay window roofs.