Roof Jack installation on a 2 layered compo shingle roof

[johnchavez]

On a double leyered composition shingle roof the second layer was installed over the roof jacks completely and sealant was applied to prevent leaking. As a property inspector I have seen the sealant cracked and moisture penetrating between the two roof layers causing problems if the old layer has room for leaks. The roofing contractor claims that this is typical (which I agree) and that it is done to code and that no correction is needed.
In my experience this type of installation has always caused problems once the seal breaks. Typical installation of a roof jack is to have the top and side edges under the shingles and the lower edge above the shingles to allow for drainage. The roofing contractor claims that having the roof jacks completely covered is accceptable and proper. Does any one know of specific installation requirements for composition roof that can back up the installation of the roof jacks either correctly or incorrectly. UBC 1509 only says that it should be according to manufacturers recommendation.
Thanks!

[Tom R]

You're right, he's wrong, it's that simple. Common sense. He's 'impersonating' a roofer.

[johnchavez]

Thanks for the reassurance, hopefully I can get some info so that I can tell the guy (and the client) he is wrong in a professional manner!

[mjpliv]

I am not familiar with the term "roof jack". What is it?

[grumpydasmurf]

Roof jack is a saftey device used in combination with a 2x4 for slide protection.

This should be nailed under the shingle. They are very easy to remove when the roof is done. A roof should never have any visible fasteners. A new roof should never have any holes. Heck! An old roof should never have any holes either.

If your looking for info, contact the shingle manufacturer.

[mjpliv]

Ok, now I understand. The ones we use are attached through angled slots and are made to hold scaffold planks or 2x10's. When the are ready to be moved the roofer taps them upwards with a hammer and they slip out from under the shingles. The nails that remain are seated (they project about 1/8") down be tapping the shingle surface.

[johnchavez]

"ROof jack" or flashing around vents and flues passing through the roof line. "not lifting jacks"

[mjpliv]

Thats makes sense as well. And the correct way to install those is with the upper flange under a one full shingle (two courses of shingle tabs)

[grumpydasmurf]

I prefer not to call flashing, jacks... since to most roofers I know of the jacks are the slip protectors.

If I were to say roof jacks at any of my suppliers they'd come with the slide protectors.

[Tom R]

Roof jack is 'short' for roof jacket, which is the 'flange' (with 'boot') that covers a vent pipe as it 'exits' the roof. It also refers to 'scaffolding' brackets that temporarily attach up and under the shingles.

[Tom R]

Johnchavez,

I could be wrong, but I would think the 'proper' appication of the roof jack would be indicated right on any shingle 'package'. If not, it would be in the first roofing book you opened. There is only 'one' way to install it, and it is as you said, it doesn't matter if it's a first layer or a second (all roofing shingles and associated parts are designed to shed water directly back out to 'daylight'). And how cheap can one be, he should be 'shot' for not installing a new one. 'Common Courtesy' with a new roof, goes without saying (in case he forgot, it's in the price he gave). 'Threaten' him by telling him you're about to call in a 'real' roofer (not a rip-and-run artist)!

P.S. At least in my town, there's no way that's "done to code", but then, he would not be able to even 'pose' as a roofer in this town. And I find it very hard to believe that's 'code' in any town, except those with 'no' codes.

[Tom R]

Here it is John, first book I looked in - - Residential & Light Commercial Construction Standards (Compiled from the Nation's Major Building Codes, Recognized Trade Custom & Industry Standards) - - published by RSMeans (page 263)

[Tom R]

John,

Sorry it came out so lousy, I'll tell you what, I'll work on my computer skills while 'Butch Hackit' works on his roofing skills.

[Tom R]

Let's try this

[johnchavez]

Tom, thanks a bunch for the information, this is helpful, I went and removed the dust off my book shelves and found that I have the book on the updated second edition. I thank you for taking the time to scan the page and photo, I know it is time consuming.
Now I have the ammunition to tell the "roofer" why he is wrong.

[Tom R]

No problem, John, I guess it's rather obvious I have no patience or sympathy for 'shoddy sheisters'.

[grumpydasmurf]

I prefer the lead flashing over the cheap vinyl "jacket". I've seen so many of those plastic boots eaten through by squirells or even crack in the winter time. I won't use em even on PVC.

[Tom R]

I completely agree, and that's a good point to make.