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#1 |
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Ice Water Shield On Low Slope Roofs
I am getting ready to cover a low slope roof with a 1.5 /12 slope with asphalt shingles. Does anyone have any experience with the use of an ice/water shield (such as a Grace Product) for this application. I would be interested to see if anyone who used this product for my type of application has any positive or negative comments. Also, does anyone know the longevity of this product.
Thanks, Bobby |
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#2 |
Pro
Trade: Roofing Contractor
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Re: Ice Water Shield On Low Slope Roofs
Yes, it can be done and the Grace Ice and Water Shield would be the preferable product to use.
The shingle will deteriorate significanty quicker on an extemely shallow slope like that though. Why don't you consider a modified bitumen APP or SBS roofing system instead? Also, there are several brands of peal and stick membrane which are intended to be exposed to the UV rays. I believe the one that is most often recommended, is made by GAF. I have not used it, since I would prefer a more durable roof membrane for those applications. 2,000! ![]() Yipee! ![]() Ed Advertisement |
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#3 |
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Re: Ice Water Shield On Low Slope Roofs
I should leave this to the roofers but in every application this product is stellular. I watched it go through 2 hurricanes (Franscis and Jeanne) naked. It's currently under my metal roof.
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#4 | |
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Re: Ice Water Shield On Low Slope RoofsQuote:
A. Where Franscis and Jeanne naked? Or B. Where you naked when watching them? Or C. Did you mean the Ice and water shield applied under the metal roof currently, which at that time of those two storms was left naked without the metal roof covering it? Ed |
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#5 |
Curmudgeon
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Re: Ice Water Shield On Low Slope Roofs
I vote for A !
I shudder at B ![]()
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#6 | |
Al Smith
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Re: Ice Water Shield On Low Slope RoofsQuote:
As far as grace ice and water I did use it under shingles on the low pitch patio roofs of a retirement community re-roof project i did 10 years ago (1 1/2 on 12 pitch). it was about 36 bucks for a one square roll back then. Looked just like vycor without the printing. The patios were tear offs, had good results. there were about 40 patio roofs but had two minor leaks during an ice storm due to insufficient roofing cement under vent stack flashing that went through the patio roofs were they tied into a kitchen sink vent stack. Ive been using gaf ice and water shield since because of the larger rolls. Last edited by A W Smith; 11-10-2007 at 12:21 AM. |
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#7 |
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Re: Ice Water Shield On Low Slope Roofs
The Grace I & W I get comes in either 75 ft x 3 ft or in 67.7 ft x 3 ft rolls which is either 2 sq or 2 1/4 sq each.
How do the shingles look after this much time on such a low slope? Pretty curled or buckled I would imagine, enen though probably still water-tight. Ed |
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#8 | |
Al Smith
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Re: Ice Water Shield On Low Slope RoofsQuote:
Last i saw two years ago the shingles looked perfectly fine. at the time i used Owens corning 25 year 3 tab when they had the continuous line of self seal adhesive. The original patio roofs were shingle with just felt under them. and very few ever leaked even though over 25 years since original construction the tabs were starting to break off, I think they were organics. These patio rooms were basically 12 X 14 unheated sun rooms surrounded by sliding glass doors. half of these people are show-birds and flee to Florida in the winter. the grace came in pretty small boxes I am pretty sure from memory I was using two boxes per patio, I remember going to the GAF because of the extra half square for almost the same price. Last edited by A W Smith; 11-10-2007 at 12:39 AM. |
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#9 |
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Re: Ice Water Shield On Low Slope Roofs
you should not shingle anything lower than a 2/12 pitch. against code.
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#10 |
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Re: Ice Water Shield On Low Slope Roofs |
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#11 |
Al Smith
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Re: Ice Water Shield On Low Slope Roofs
All those roofs I did in the retirement community passed inspection. The patio rooms might have been a bit steeper now that I'm thinking the rake went up the slope about 30 or 36 inches onto a 4/12, Was a long time ago and I have not been in that gated community in 2 or 3 years. If it was 2/12 it was just barely.
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#12 |
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Re: Ice Water Shield On Low Slope Roofs
At Grace we go by the roof covering manufacturer's recommendations as to lowest slope. I have seen many 1:12 work fine w/GIWS as a waterproof barrier. As posters mentioned, shingle life expectancy is reducecd at these slopes.
Jim |
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#13 |
Curmudgeon
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Re: Ice Water Shield On Low Slope Roofs
Jim--
It would be nice if you would clarify your trade in the signature. No shame.
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#14 |
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Re: Ice Water Shield On Low Slope Roofs
You should not only check your code but also the shingle manufactures specs for min roof slope "most say 2/12". from a 2 to a 4pitch full I&W is a good idea.
under 2/12 it should be considerd a flat roof. Ice and water shield is great stuff but its not magic. |
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#15 |
Serrano
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Re: Ice Water Shield On Low Slope Roofs
The real concern is how long for the nails to rust until the diameter of the the shank has been reduced enough to allow water penetration.I have replaced to many porch roofs to count that were under 4/12 with all I&W and the shingles were fine but the nails had rotted.
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