That badly needs reroofing. The pitch is slightly more than 2″ and presently has double coverage roll roofing. It’s about 14′ by 22′ wide fit into an ell. The contractor wants to use asphalt shingles over ice and water shield under the whole roof. Is this acceptable installation? What would be the going rate for a job like this?
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2" slope in 14'? That's a flat roof. Where are you? If Vermont then your going to have a big snow load, Florida and you got a plane.
Anything under 3/12 should not be shingles. If this is for appearances ,and at 2" slope I doubt you can see the roof, maybe the shield will be fair but water is going to get under those shingles.
Then there is the connection in the corner. I'd use ice shield and then roll roofing.
Edited 5/7/2008 9:28 am by jagwah
he said there would be complete coverage with the i&w, so it sounds like the singles are for appearance. Would that still be a problem?"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
yes..
will hold water...
water will migrate / wick under the shingles...
and find it's way thru the nail penetrations in the I&WS...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!Forget the primal scream, just ROAR!!!
Water will still get under the shingles but other than that no problem it's just with that little slope they can't be seen. If you can't see them than why use them and spend the extra money.
If you can't see them than why use them
Well I wouldn't want to see the "Grace" logo printed all over the roof. Nor the wrinkles. And is i&w rated for long term exposure, like 10 years?"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
My point being form follow functions. The function of this is to keep out water. The form is pointless here, no aesthetic value to using shingles on that low a pitch.
A nearly flat roof with shingles offers no additional weatherability but offers additional risk. While well sealed with a Grace like product it would only make sense to use the shingles despite this for just a few reasons.
1. It can be seen due to elevation of street approach
2. It is seen from above say from a second floor porch or window
3. Local covenants require all roofs to be shingles hopefully to thwart low roof line construction
4. 'Cause the owner wants to use them, (high card).
years ago I got owenscorning to OK the install of dimensional shingles on a 2/12.
they said I had to cover the whole roof deck with ice / water shield first.
building inspector that that was cool with him as long as I increased the soffit and ridge vent to continuous.
2/12 was as low as they'd OK.
I ended up being able to frame it around 2.5 / 12.
had a chance to look at it about 5 yrs after and it still looked nice.
I also shrunk the exposure.
usually shingle normal down to a 4/12
shrink the exposure down when working on a 3/12.
Jeff Buck Construction
Artistry In Carpentry
Pittsburgh Pa
Maybe they can see it from inside the house.
"Doubt is not a pleasant condition, but certainty is absurd."
~ Voltaire
No shingles. I suggest rubber roofing rather than roll roofing. Much longer life span. 0.060 EPDM should last at least 50 years. Trocal even longer, if you can find a qualified installer.
did you mean 2" of slope per one foot of run???
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!