How To Build A Bay Window Roof

It s time to finish planning the roof frame.

How to build a 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. A projection with four or more angled faces is a bow and cannot be calculated with easy rafters. 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. A few make 60 degree bays.

All major window manufacturers offer angled bay windows in both 30 and 45 degree configurations. 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. Most also offer 90 degree box bays. You ll also have to plan for the bay window roof.

But once the window its frame and its cap are in place you can get started framing the roof. The secret to a good looking roof is having the right proportions. Plan out the roof. A box bay with a glass roof is known as a garden bay or greenhouse window.

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. Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.