First the instructions to find the ridge length is wrong.
How to build a hip roof on a bay window.
Roof framer s bible framing a bay window roof page 206 does not follow the holly grail of roof framing trigonometry and geometry.
Most of the time a bay window will have a hip roof that s constructed using 45 degree angles.
Bay angle is the angle that the side walls of the bay slant out from the wall the bay is built against.
You ll also have to plan for the bay window roof.
We asked one of our veteran builders to show us how it s done.
To get started building the bay window roof frame take a 2 by 6 ledger board and nail it onto the back wall.
The starting pitch is 3 12 and the ending pitch is 16 12.
Then create the perimeter of the roof using the 2 by 6 sub fascia boards.
Select 30 45 60 or 90 degrees from the dropdown list or enter any positive number of degrees from 1 to 90 directly in the input field.
Begin by measuring and cutting the wood then move on to installing the rafters and sheathing.
Part 1 build the roof first to make the installation a little easier.
45 wall with projection 24 45 wall with projection 28 45 wall with projection 32.
How to install a bay window.
Supporting a cantilevered bay before building that eye catching bay on the side of the house you have to get the floor framing right first.
Part 1 measuring and cutting rafters.
But once the window its frame and its cap are in place you can get started framing the roof.
How to install a bay window.
It s time to finish planning the roof frame.
Enter the angle of the bay.
It looks like diy built the bay window roof.
It s wrong and just plain ugly.
This bay window rafter script will print out a chart of all rafter lengths and angles for the baywindow.
In this video rick arnold shows us his simplified method for laying out and building a bay roof.
Plan out the roof.
Do not use this method to framing bay window roofs.
Part 2 with the roof built it s time to install the window.
Partial hip roofs are common over porches entryways etc.
While it s common to build hip roofs from trusses or premade frames it is possible to build your own hip roof.