More in Outdoors
The cupola has a flat bottom and must be modified to fit the roof. To find the roof pitch, screw two pieces of 1x together then lay it on top of the roof. When the edges meet, screw in a second screw. Transfer the angle to a piece of craft paper.
Determine the center of the cupola, line the center tip of the template up with the center of the cupola. Move it down until the edges of the craft paper run off the corners of the corner detail. Use a jigsaw to cut saddle in base.
To secure the saddle to the roof, use green treated 2 x 4 cleats nailed directly into the roof on two sides of the saddle. Nail the saddle to the 2 x 4 cleats and secure the cupola together with plenty of nails. Make sure that the vent is lined with a screen to keep out bats and insects.