I am getting ready to install some ventilation in my flat roof. I've decided to go with this system:
Flat Roof Top Attic Ventilation. It looks perfect for my application.
I've done some research on how to install the fan, including on a couple other forums, but have a couple of unanswered questions, and would like to confirm my process with all here. As I am sure it is important, I have a granular surface modified bitumen roof. So, the process I am considering so far is:
Step 1: Cut hole in roof vent location selected.
Step 2: Prime top and bottom surfaces of flange of vent that will be set on roof. Allow primer to dry.
Step 3: Coat bottom of flange with roofing cement.
Step 4: Set vent in place, and mechanically fasten to roof deck with screws.
Step 5: Apply roofing cement to top of flange and cut piece of roofing felt to fit around penetration. Apply roofing cement to one side of felt. Apply felt to flange and rub together.
Step 6: Repeat Step 5 with another piece of felt.
Step 7: Coat top of roofing felt with roofing cement. Coat bottom of a piece of base membrane with roofing cement. Apply membrane to felt and rub.
Step 8: Coat membrane with cement.
Does this process sound correct? Am I missing anything? Anything overkill?
So, I have a couple of questions.
1) What type of primer should I use on the flange?
2) For the first two layers should I use #15 asphalt saturated felt or asphalt saturated glass fabric? Does the glass fabric come in wide rolls?
3) Can I use SBS modified bitumen roofing as the final layer or is there something better?
Anything else?
Thanks!