First remove ridge cap where cupola will be installed.
How to cut cupola base to fit roof.
Mark both sides of the cupola the same way and use a saw to cut out the angle along your marked lines.
Preparing your roof draw a center line on the cupola base on two opposite sides these will become the angled cutouts for your roof.
Cut the cupola base to match your roof s pitch the base of your cupola comes square.
Start cuts at corners and end at center.
Mark the boards apply another screw.
E g a 30 square cupola would have a 24 square hole be sure not to cut any structural members.
You are only cutting away the shingles and plywood sheathing.
You may need to use the utility knife to trim the shingles back.
Cut a hole in the roof that is at least 6 smaller than the inside perimeter of the cupola base.
Take two 1x4 boards lay them on edge pushing them tight against your roof and fasten together.
I cut the hole with my circular saw 4 inches smaller than the base on all its sides.
Line up the pivot point of the template with the center line and make sure the corners of the template meet with both.
I knew then the added ventilation would be helpful.
If you do you will need to patch this spot with vycor rubber flashing tape or flashing and shingles to prevent water intrusion.
This becomes your cutting template.
This will be your cutting line.
Using your cutting template make a line from each corner to the centerline.
This is the most difficult part of the project.
A 45 degree roof can be scary take your time and have proper staging.
In order to bevel the soffit parts set the blade at 45 degrees and the fence 4 3 4 in.
Cut and remove only the ridge shingles and or ridge vent up to the outer edge of where the cupola will sit.
To cut the pieces that will form the sill of the barn cupola bolt a 1x6 to the saw s fence to keep the workpiece from tilting set the blade at 19 degrees and position the fence 3 4 in.
The second step in any cupola installation is to properly cut out your cupola base.
Mount four sections of 2 4 blocks to fit flush inside the edges of your cupola.
Trace a line along both inner sides of the.
When i opened the roof a rush of warm moist air can out.
Since roofs have all different pitch angles the manufacturer leaves it up to the installer that s you to cut it down to size.
Mark the cupola base draw a centerline on the cupola base as shown.
To do this you must first determine roof angle or make a pattern using two boards as shown in this image.
Use an angle finder to measure the pitch of your hinge tool then position it against the cupola base.
