Vent Sure High Performance Slant Back Roof Vent
the metal boxes look like they are in good shape. Slight (if any) denting and a couple of spots with rust about the size of a nail head to the size of just under a quarter on each. I can probably use a rust inhibiting paint over them. Under the boxes it probably will not be possible to nail. You surely can push the shingles under there with no problem but no way to nail them down under the boxes,unless the boxes themselves can be raken off (I did try playing with them a bit but I couldn't budge them and did not want to bend anything. Looks like there is some kind of clasp but I can't move it. Unless you have a suggestion i will just go and look at them in Lowes.
The whole question of venting the attic is interesting. I had 4 roofers come to my house to give me an estimate. All of them reputable; at least one of them an OC certified roofer. I had 3 different stories; 1) put in a fan (and close the old boxes) 2) put in a ridge vent with some low profile vents or 3) close off the old boxes and put in a ridge vent. Not a single one measured the interior space of my attic and so far as i can see I am far off from what is needed for a ridge vent. Were they just counting on their experience? and if so they seem to have gotten it wrong (except for the guy with the fans, if you believe that fans do the job). Or is the question of venting not as important as i thought. After all, on the exterior a roof has to be able to cope with some 150 degrees or more. I wouldn't conclude that it is unnecessary to vent, but on the other hand it makes me want to rethink the question of venting for the sake of the roof. For the question of mildew and moisture build up that is another story.
I should add that i found that my utilities company has an depsatment of energy services or consumer affairs that was very helpful. i found them to be very knowledgeable and seemed to be well informed of studies dealing with ventilation and roofs. They might be an additional resource for people who have questions, though I am not sure all the utilities companies have such a department.
Last edited by Alto; 07-04-2010 at 01:12 PM.