Metal Roof Fastener Question

 
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Old 04-08-2011, 07:21 AM   #1
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Metal Roof Fastener Question


If a metal roof is installed with the appropriate screws that have a rubber washer under the head, and they are installed properly and not overtightened, how long will they last? Will the rubber washers degrade prematurely and cause damage that is difficult to detect for a time? I ask this question because someone posed this scenario to me, and I never dreamed that the fasteners would need to be replaced periodically, as proposed to me, as long as they are installed properly to begin with.
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Old 04-08-2011, 07:33 AM   #2
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Re: Metal Roof Fastener Question


It's not just the washers that will fail over time. Depending on temperature extremes, the screw holes become elongated due to thermal expansion and contraction. This can create a hole which the washer no longer covers completely.

A good and proper underlayment is essential for long term performance.

For guidance on washer life, ask the specific manufacturer what they expect.

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Old 04-08-2011, 08:02 AM   #3
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Re: Metal Roof Fastener Question


I live in Mt where our temp go from -30 to 100 and on a steel roof I have never seen the holes elongate so the washer does not cover. I have seen more leaks from back when lead headed nails where used. Screws not placed proper on the panel also tends to lead to screws working loosing and then leaks. I agree check with manufacture for what they expect the service live to be.
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Old 04-08-2011, 05:49 PM   #4
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Re: Metal Roof Fastener Question


i have seen fasteners actually shear,or back themselves out from metal movement
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Old 04-08-2011, 10:49 PM   #5
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Re: Metal Roof Fastener Question


Yeah very true. Seen alot sheered and even more backed out. Thats what happens when you get two materials that expand and contract at different speeds.
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Old 04-09-2011, 08:04 AM   #6
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Re: Metal Roof Fastener Question


I follow you on the dissimilar materials expanding and contracting at different rates. So, would this be less of a problem on metal roofing installed on a steel framed commercial building, and more of a problem on a metal roof installed on a wood framed structure? Common sense tells me the answer is yes, but I'm interested in learning what actual experiences roofers have had or seen, along with any other comments you have.
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Old 04-09-2011, 08:39 AM   #7
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Re: Metal Roof Fastener Question


Do a HF system and be done with it..
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Old 04-09-2011, 09:27 AM   #8
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Re: Metal Roof Fastener Question


Don't know what you people are looking at but I've been looking at the same thing for 30 years now. Screws ALWAYS backing out, generally starting at the eave and working up.

I refuse to install one on anything short of a pole barn or chicken coop. I hear all the time "it's ten years old and doesn't leak" Sorry to say but you are wrong. It's ten years old and you don't know that it's been leaking for five. Moisture IS seeping in every hole in that roof and rotting out the screw hole and/or rusting out the screw. Doesn't matter if it's seated properly or not, it's going to fail. It may not be leaking inside but it is causing damage, you just don't see it.

As far as nails go. Have you ever had to remove those old aluminum twist nails? Those suckers weld themselves into the deck. Much better than any screw.
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Old 04-09-2011, 11:42 AM   #9
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Re: Metal Roof Fastener Question


I think barn metal looks cheap on a house roof........use standing seam and forget about screws or nails with washers
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Old 04-24-2011, 07:13 PM   #10
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Re: Metal Roof Fastener Question


So what would you prefer on a 3/12 pitch roof, shingles or a metal roof with threaded fasteners?
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Old 04-24-2011, 09:28 PM   #11
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Re: Metal Roof Fastener Question


Quote:
Originally Posted by painterblaster View Post
So what would you prefer on a 3/12 pitch roof, shingles or a metal roof with threaded fasteners?
Shingles with ice shield on entire area.
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Old 04-25-2011, 06:17 AM   #12
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Re: Metal Roof Fastener Question


There is nothing wrong with an exposed fastener roof system. Will they require maintenance? Maybe...but a good install is critical.
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Old 04-25-2011, 08:03 AM   #13
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Re: Metal Roof Fastener Question


(Speaking of results for my regions weather conditions).

Shingles on a 3/12, properly installed, will last 10 too 15 years (give or take), then you'll need to replace them.

Metal on a 3/12, properly installed (exposed fasteners or not),
will last 15 too 20 years, but then you can do a restoration of the system and get another 15 too 20 years.
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Old 04-27-2011, 07:41 AM   #14
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Re: Metal Roof Fastener Question


Quote:
Originally Posted by Slyfox View Post
(Speaking of results for my regions weather conditions).

Shingles on a 3/12, properly installed, will last 10 too 15 years (give or take), then you'll need to replace them.

Metal on a 3/12, properly installed (exposed fasteners or not),
will last 15 too 20 years, but then you can do a restoration of the system and get another 15 too 20 years.
Copper will last 80-100 years on the same roof.

I got a call a few days ago to look at some copper work on a local prison. When I told my wife about it she seemed incensed. Made her mad that the criminals might get copper over their heads. I had to explain to her that a on a building that would likely have the same ownership for the next 100 years, it was actually cheaper to do one copper or slate roof VS four asphalt shingle roofs. Finally got her calmed down. She was about to write a strongly worded letter.
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Old 04-27-2011, 07:57 AM   #15
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Re: Metal Roof Fastener Question


Quote:
Originally Posted by Slyfox View Post
(Speaking of results for my regions weather conditions).

Shingles on a 3/12, properly installed, will last 10 too 15 years (give or take), then you'll need to replace them.

Metal on a 3/12, properly installed (exposed fasteners or not),
will last 15 too 20 years, but then you can do a restoration of the system and get another 15 too 20 years.
What does a "restoration of the system" consist of?
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Old 04-27-2011, 09:43 AM   #16
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Re: Metal Roof Fastener Question


Quote:
Originally Posted by RandyB1986 View Post
What does a "restoration of the system" consist of?
i would think re-screwing and such...i dunno.

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