Sealing A Continuous Ridge Vent – The method I used was not great

But it was the best I could come up with off the top of my head. Now that I think about it I probably should have used hardening spray foam from a can. Commonly referred to by the trade name Stuff.

As you can see from this question:

Roofing – Icynene Insulation and Sealing Ridge Vents

Expert: Dan Merrill – 7/26/2007Question
I am having a home built and plan to have icynene foam insulation sprayed into the attic (exterior walls and the attic ceiling)as well as exterior walls.   My understanding is that with foam insulation, ridge vents are not needed and in fact defeat the purpose.   The house is now framed and the architectural shingles are being installed this week.   I noticed that the opening for the ridge vent has not been physically closed.    The builder uses a truss design rather than a stick built roof.    The tar paper and shingles are just being laid over the open ridge.Is this a problem?   It seems to me that there should be a more solid barrier at the ridge…like wood, rather than just foam, tar paper, then shingles.Any thoughts?   ThanksAnswer
It should not pose a problem.
The usage of conditioned attic space as you are building is fairly new to the building codes and not in general use.
It is likely that most roofing installers have never seen the specifications before, so they just did as they always do.
The foam will be sprayed under the whole roof deck, so it will act as a vapor barrier. The opening cut for a ridge vent should have no affect.



However what I did  was cut a rectangular piece of black 4 mill. plastic:

Big enough to cover the exposed vent space between the rafters and allow some “drape” over all of the exposed surfaces, approximately 2 ft. by anywhere from 20 inches to 30 inches. I made a continuous bead of 30 year silicon caulk in a square configuration much smaller than the piece of plastic:

I pushed this up to the peak of the roof, making sure to make complete contact between all of the wood surfaces and the caulk. I then smoothed the plastic out and popped in  5 or 6 staples with my PowerShot staple gun.

Then I put the insulation back up. I bought a cool new product for cheap; plastic wrapped r-17 insulation for 16 bucks. Kinda like insulation in a tube.

And I dragged it across the artificial ceiling studs.


A reader could rightfully ask, why didn’t you make the roofing company come and fix it?

The answer is 2 fold. One, I ordered the roof and I should have been aware that it came with a continuous ridge vent. It is not up to the roofer to go into the attic to determine if you ordered the right roof before he or she installs it.

Second I always fight the battles I want to fight. I have expertise in this area and though I wish I would have thought of the foam solution earlier, it did not take much longer to fix the problem the way I fixed it. Another homeowner might have thought that this was a fight to take to the roofing company.

It turned out when we finally got around to stripping out the paneling to remodel the attic that they had done the same thing to the dormer…man was it hot up there!


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