Hi everyone my name is cookie, Hows every one doing?
I would like to know in the September issue 2003 #157 I have a question on the article [ adding a bathroom fan ] having never attempted a roof vent the article seemed very clear about the project, except for sealing the roof vent and flashing.should all flashing and vent be sealed with a roof tar ? And would it be a good idea to cover flashing that’s sealed with ice and water shield? Any advice would be helpful…….
Thank you Cookie
Replies
as a general rule, keeping the laps facing downhill will keep it from leaking but the side flange on vent caps is pretty narow sometimes. That makes it better to run a bead of caulk there.
Excellence is its own reward!
Thank you Piffin for responding.
If you use a little ice & water barrier UNDER the shingles and vent flange downhill from top of the opening and a nice covering OVER the flange and under the shingles uphill from the bottom of the opening, very little tar should be needed. Perhaps a little along the edges as Piffin suggested and a bit under the lower edge of the flange for wind-blown water and a dab on the few nail heads that may be holding the lower edge of the flange down tight. Ice & water barrier sticks very nicely to the metal flange. You probably only need to go about a foot in all directions.
Echoing what Piffin said, water usually flows downhill. I amazed at how often I see roof shingles OVER the lower part of vent stack flashings. I wonder where these folks think that water will go.
Al Mollitor, Sharon MA
Thank you Al for responding.