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Old 07-13-2010, 07:57 PM   #16
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Asphalt Shingles-What's Best??


DAV, can U
advise the pitch and style ...hip... gable.. mansard...cut up ????

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Old 07-13-2010, 07:59 PM   #17
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if your shingles are shot in 12yrs something was wrong with the install. a roof over could be the culprit as they generally knock the life in half. certainteed makes a great shingle and since they are made here in the NW the prices are good. landmark 30s run 20.60 a bundle. in all honesty the brand you choose matters much less than how it's installed or what it's installed over. even though they are legal i hate roof overs with a passion. more weight, less life and higher chances of moisture between layers. once you get the old roof ripped off it would be time to inspect the deck to find out if it's usable of if you need to replace sheathing. once that's done pick your favorite shingle and install it right. i read for at least a week before i re roofed my home this year. long story short i'm on certainteed landmarks. why? love the color, love the ease of install and the cost between gaf, corning and these were within $1 a bundle. if you have a woodfeathers down there it would be the store to go to, they are one of the largest roofing suppliers in the nw

sheathing prices are also screwy here in oregon. 15/32" cdx is $18 a sheet and 7/16 osb is 9.77 a sheet, i don't think i ever remember the spread being this high before. in fact it's so bad 5/8" cdx is only $20 a sheet. if you re sheet the 5/8" cdx is the strongest and osb the bargain wood that isn't bad for the money. 15/32" cdx is just a bad buy right now with the close cost of 5/8" and huge spread with osb

Last edited by racebum; 07-13-2010 at 08:03 PM.
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Old 07-13-2010, 08:14 PM   #18
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Asphalt Shingles-What's Best??


Bad advice on roof overs, what you describe is installation error during the roof over, not the method itself.
My home has a roof over, it's 20 plus years old and has never leaked or blown off and it's still holding out the weather.
It's one of a few dozen I have done, never had one fail yet.

You are correct when saying the workmanship used to install the materials is equally as important as the materials used.
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Old 07-13-2010, 08:25 PM   #19
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what's the trick with making a roof over work? i've only seen 2, my home and another that both failed early. moisture was present in large amounts between the 30lb and old tar paper.

i mean, i know you're a good deal smarter in the roofing dept than i slyfox but why would someone not take the day or two scraping old shingles usually takes on your average 1000-2000sqft home?
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Old 07-13-2010, 09:29 PM   #20
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Quote:
Originally Posted by Big Bob View Post
DAV, can U
advise the pitch and style ...hip... gable.. mansard...cut up ????
5-12 Inverted "V"roof
attached 2 car garage thats ends up having a valley on the north side of the garage and west side of the house (entrance side) We have been experiencing ice build up on that area, I have code as to vents etc and insulation but sitll ice builds up and the present roof is only 12 yrs old and it started to go bad 2 yrs ago.
this help??
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Old 07-13-2010, 09:33 PM   #21
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NOT A ROOF OVER ( IF YOU MEAN ANOTHER LAYER OF SHINGLES ON TOP) ENTIRE ROOF STRIPPED NEW TAR PAPER NEW MOISTURE BARRIER AND ORIGINAL ROOF ON HOUSE ONLY LASTED 18 YRS. wE REPLACED THAT 2-4 YRS LATER THAT WE SHOULD HAVE.I HAVE HAD MORE THAN ONE ROOFING CONTRACTOR LOOK AT IT AND THEY ALL SAY THINGS LOOK OK.'

THANKS
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Old 07-14-2010, 12:34 AM   #22
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THE PROBLEM WITH THE CERTAINTEEDS IN YOUR AREA WAS THAT THEY WERE ORGANIC BASED,I have seen the same thing in Indiana with the organics,Up here in NY ,most of them are fiberglass base rather than the organic base because the same thing happens to shingles with organic base

I believe last" Consumer Report" roofing testing listed Tamko Heritage as the best,And I tend to agree
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Old 07-14-2010, 12:36 AM   #23
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btw ,the certainteed fiberglass have no problems at all here either,but all the organics seem to crap out in 10-12 years,unless the roof is shaded,and then it can last longer
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Old 07-14-2010, 01:21 AM   #24
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i live in the same state as the op and just bought some landmarks last month. most definitely fiberglass. do they still make organic shingles?
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Old 07-14-2010, 01:29 AM   #25
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some do,Although a lot of mfgr`s are avoiding it today,they are better used in colder climates,also why they last longer with shaded roofs-I believe BP,AND iko make some organic metric shingles they sell in Canada,while they are starting to introduce the fiberglass here now.

Also its been my experience that roofs laid over another do not last as long as others as the extra layer eliminates breathing,As a result the condensation can become trapped,and rot the plywood from underneath,good soffit to ridge venting can help deal with this problem,but not completely
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Old 07-14-2010, 07:02 PM   #26
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Both Certainteed and Malarkey have a 1.5" nailing area for roofs under 21/12.
This gives the installer more nailing room, other brands only give you a chalk line. Misplaced nails can/will void manufacturers warranty.

I myself like Cartainteed Landmarks, going to put 40yr on my own roof. GAF seem to lose a lot of granules in the package alone.
As far as OC Durations, I'm not a fan of that continuous line of sealant tar on the bottom of the shingle. This solid line leaves no room for air to get in, meaning any moisture that can get in, will stay.

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