I have a leak on a tourch down style flat roof. The roof repair person said he would patch it , then he recommended a product that you can roll on like paint for the rest of the roof, and that it would prolong the life of the roof. Does anybody know what this product is? Is it any good? I live in the Seattle area which gets a lot of rain?

We live in upper Vermont, in a house that was built somewhere between 1815 and 1850 (depending on which records you look at.) It's a 2 story brick farmhouse with double wythe walls and interior timber framing, which is inset into the first wythe of brick at the exterior wall. The roof is about 6:12 slope, so when we moved in the attic was finished with occupiable rooms and a bathroom. The house had a sad history, and sat empty for about 20 years - no windows, brick collapsed on the back, etc. About 30 years ago a previous owner renovated the house, and put on lapped metal roofing. About 6 years ago we gutted the attic to reinsulate it with closed-cell spray-foam insulation, which was applied directly to the underside of the roof decking and between the framing members. The attic hasn't been occupied since. Here's the issue - over the past four days, we're hearing significant popping in the attic at night. I know this is most likely thermal expansion and contraction noise, as it's been about 10 -20 above zero during the day, and as low as -10 at night. The thing I can't figure out is why, after 13 years of living in the house, with no appreciable noises before either before or after insulating the roof, it's just starting now. The night it started it was scaring our 13 year old (who was in his second floor bedroom) pretty good. I went and stood in the attic for several minutes, and could hear "mild to moderate" noises every few minutes - locations varied. Then one pop just over my head was loud enough to startle me - for as loud as it was I would expect to find the foam delaminated from the framing, or the framing split. Again, it's kind of freaking me out that after 13 years of no noticeable noise, all this is starting in the past four days. I see no obvious signs of deterioration in the brick walls or roofing. Being two stories up and winter with snow on the ground I can't inspect the outside of the roof close enough to see if screws are being ejected. We've had a very cold winter up here with prolonged periods of negative nighttime temps due to the arctic blasts that have come through like trains...could the increased noise be a result of the prolonged cold "settling in" to the roof? We've had MUCH colder periods - even this winter - with temps as low as -26, with no noticeable noise; but this winter we've had less severe temps, but for more prolonged periods of time. The large bang over my head occurred near framing close to the plumbing vent through roof. I guess if a leak has occurred there moisture could be getting under the metal and freezing...? (we hope to replace the roof this summer - it has some other issues as well.) Any ideas why it's happening just now?