Help with vent through the roof

my house has flat roof and I want to install bathroom vent through the roof (second floor bath). How can I seal the flat roof if I do the vent through it. please give me step by step , i am kinda new about it.

thanks

 

What type of roof is it?
Built-up-asphalt?... smooth, coated or gravel surfaced?
Coal Tar Pitch? Smooth, Gravel or mineral surfaced?
Modified Bitumen? (another Built-up variety) smooth or mineral surfaced?
Single-ply...PVC, TPO, CSPE, EPDM? lots of choices here.

If your not sure, and I just confused you....it might be wise to hire someone who does know the difference... as most materials are incompatable with one-another.

 

For this vent on a flat roof Id say dont try it. Is there no way to go out in the over hang or out the wall there?

ED

 

I just checked it, my roof is rolled smooth roof. any ideas

thanks

 

You should get a "1 piece " hood with flange, Set it down into a thick bead of "modified" plastic cement. Nail it down on the permiter edges of the flange every 1.5-2 inches. Then take a piece of the "smooth surace" material your roof is made of , and cut it out so it fits around and over the flange snuggly, and goes past the outer edges of the flange a minimum of 8inches, then apply a liberal amount of that "modified" plastic cement to the underside of your "patch". Firmly push down to set the "patch" or "counter flashing" till the goop {"modifed" plastic cement} squishes out a bit on all sides...on both inner and outer edges. Now look for any little openings......if no openings, it should work, although you might want to check it in a day or two to make sure your patch hasn't "popped open" somewhere....

This is the kind of job we might normally charge about $150 to do, and guarantee it...so you might consider finding someone {like a previous poster mentioned} who's familar with roofing materials and how they work, and just pay them to utilize their skills.....

 

Grainger has the vent top for flat roof with a good flange on them . If you can buy from them.


ED