2. The base flashing provided is fabricated to accommodate a roof curb built on the job site. It is precut to fit a 4/12 roof pitch." For a 24" (#240) cupola, the outside curb dimension should be 23 5/8" x 23 5/8". For a 36" (#360) cupola, the outside curb dimension should be 35 5/8" x 35 5/8". For a 48" (#480) Cupola, the outside curb dimension will be 47 5/8" x 47 5/8". This will allow for the assembled cupola to fit over the curb after the metal flashing is applied. The curb should be built so that the top is 1 1/2" above the ridge line, allowing for roof sheeting (which is not shown in the illustration).

3. The side piece should be bent in the center to match the roof pitch, then set in place and nailed to the curb.

4. The end piece is attached to the curb next. Sealant should be applied between each piece.

5. The notched side piece is attached last. Sealant should be applied between each piece.

6. The two piece screen mounts horizontally on top of the wood curb. ( Not Shown)

Optional precut base flashings are available for 3/12, 3.5/12, 6/12, & 8/12 Pitches.