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.
How to build a bay window roof.
Most also offer 90 degree box bays.
But once the window its frame and its cap are in place you can get started framing the roof.
A box bay with a glass roof is known as a garden bay or greenhouse window.
Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.
The secret to a good looking roof is having the right proportions.
Plan out the roof.
We asked one of our veteran builders to show us how it s done.
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.
It s time to finish planning the roof frame.
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.
Each bay type comes in hundreds of standard and custom sizes to fit any opening.
You ll also have to plan for the bay window roof.