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4. Use a reciprocating saw to cut out the traced hole pattern from the roof decking. Remove the cut out
decking material from around the hole as needed.
If installing on a tile roof, continue to step 5. If installing on a shingle roof, skip to step 11.
5. Apply weatherproof barrier to the roof. (See Figure 2.3B)
6. Position the fan so that it is centered with the vent hole.
7. Lifting the fan unit up at an angle, apply weatherproof sealant to the bottom side of the fan unit. This
will help keep the fan in place and will seal nice and tight. (See Figure 2.3C)
8. Using a minimum of 8 roofing nails, nail the fan to the roof through the primary flashing. To prevent
leaking, be sure to apply weatherproof sealant on the nail heads. Once complete, apply more
weatherproof barrier to the top of the flashing. (See Figure 2.3D)
9. Using sheets of aluminum, construct a secondary flashing out of two pieces of material by cutting out
a semi-circle shape on either side while flaring up the edges that will stick up above the tile, creating a
“bib” that will go around the fan. Once constructed, install the flashing material on top of the primary
flashing and attach using weatherproof sealant. (See Figure 2.3E)
10. Apply weatherproof sealant all around the fan housing and secondary
flashing, closing the gap between the flashing, the fan unit, and the tile.
Using an angle grinder, cut the removed tiles as needed. Re-install the
tile around the fan unit. (See Figure 2.3F, 2.3G, and 2.3H)
Shingle Roofs:
11. If you have a shingle roof, insert the reciprocating saw sideways between
the shingles and roof decking. Starting at the 3 o’clock position of the
vent hole, begin cutting in a sweeping motion under the shingles, cutting
through any roofing nails or staples. Continue cutting counter-clockwise
around the vent hole until reaching the 9 o’clock position. Using a
roofing knife, cut a 4 inch horizontal slit in the shingles at the 9 o’clock
and 3 o’clock positions of the hole, allowing the fan’s flashing to slide
underneath the shingles.
12. Slide the fan unit underneath the shingles until the fan reaches the top of
the hole. (See Figure 2.3I)
13. Lifting the fan unit up at an angle, apply weatherproof sealant to the
bottom side of the fan unit. This will help keep the fan in place and create
a tight seal. (See Figure 2.3J)
14. Secure the fan flashing to the roof using a minimum of 8 roofing nails.
Finish applying weatherproof sealant around the fan and nails and secure
the shingles by re-nailing them into the roof. (See Figure 2.3H)
Figure 2.3I
Figure 2.3H
Figure 2.3J
