How do I fix leaking vents?

Question

I replaced my roof this summer but there are still leaks below 3 of 6 vents. I used a lot of roofing cement and completely covered the edges of the vents with shingles. Should the bottom half of the vents be exposed? Is more roofing cement the answer?

Answer 1

the jacks(vents) should have a 1/4 to 1/2 " gap from the raised portions of the jack and the shingles. also do not put a splice or a seam between the shingles within 4 inches of the outer edge of the metal. and if you used the same jacks, you need to use some monkey poo over the holes. and the bottom corners should be tacked with a galvanized tack that hits home and purchases. also it should have a shingle under it instead of metal to wood. and if the jack is more than roughly 9 inches wide, use 3 tacks. check where the moisture is coming from. as in trace it up hill. water usually goes down hill, but a leak can sometimes go uphill. depending on alot of circumstances and materials used. it can act just like an okie gas credit card.
almost forgot. the top of the jack needs to be sealed with monkey poo as well.
also you dont nail the shingle on the jack except for high and at the edge of the metal.

Answer 2

yes, the bottom should lay on top of the lower shingles.I don't think that is your problem. I put a new roof on and had the same problem. I finally realized, by looking at nearby houses, the neck of my vents were shorter. I then figured that rain was being driven or blown over the rim on the upper side. I placed a piece roofing to block the ones leaking on the upper side. I cured the problem. It looks like crap, if you are on the roof, but I just don't invite my friends up there.

Answer 3

You need to check and make sure that the flashings are sealed to the pipes. If these are heating vent pipes also make sure that a storm collar is installed on the pipes.

Answer 4

Try using flexiable aluminum flashing and also try spray foam outdoor insulation/