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Gus
malihini

USA
94 Posts

Posted - 04/04/2019 :  09:16:26  Show Profile  Reply with Quote
My roof is about 10 years old. I noticed while cleaning it that virtually every fastener has rust around it. Also, the bottom of every panel (just above the rain gutter) is rusted. I have no idea who installed the roof as I bought the house 18 months ago. Any suggestions as to what, if anything, to do?

GoingFeral
Newbie

USA
11 Posts

Posted - 04/04/2019 :  14:26:13  Show Profile  Reply with Quote
Power wash, apply Ospho to each fastener head, apply Gaco silicone paint (the type for catchment system - available at HPM)
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terracore
Punatic

5701 Posts

Posted - 04/04/2019 :  16:30:07  Show Profile  Reply with Quote
Our roof is older than yours and has none of these problems and I'm interested in troubleshooting the cause. What is your roofing material exactly, and can you tell us more about your climate and location, and exposure to vog?
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kalakoa
Motormouth

11958 Posts

Posted - 04/04/2019 :  17:01:12  Show Profile  Reply with Quote
I'm curious about the specific fasteners. There are two kinds: the ones they sell at HPM, and crap.

An expensive solution would be to re-roof the house, but save all the old roofing and use it to build a carport or other "less-critical" structure... Crazy overkill? Sure, but do you want to deal with it in 10 years, or install something that will outlast you, so you can do other things with your life?
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Gus
malihini

USA
94 Posts

Posted - 04/04/2019 :  17:17:30  Show Profile  Reply with Quote
The former owner, I have found, would save a buck wherever he could, so I'm sure the roof, which appears to be galvanized steel, has the crappiest components available. Re-roofing, especially with solar panels on it, would be expensive, and I really don't think I'll be living here in 10 years. Also, I already have both a carport and a large separate garage, so would have no use for the panels. I think the Ospho and silicon paint is the way I will go. Terracore, as to location, I am about 3 blocks from your weather station, on 39th.
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randomq
Punatic

USA
1594 Posts

Posted - 04/04/2019 :  17:46:15  Show Profile  Reply with Quote
Never get the fasteners in the back corner of Home Depot near the PVC roof panels. They are allegedly galvanized, but started rusting on me in under a year. Agree with Kalakoa, the stainless steel and enameled fasteners at HPM are expensive, but way better.
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Rob Tucker
Kama'aina

9756 Posts

Posted - 04/04/2019 :  18:13:02  Show Profile  Reply with Quote
Regular galvanized steel roofing doesn't hold up to the acid rains we've had. I had to replace one roof on my farm. Galvalume is higher quality and holds up fine.

Galvanized metal is a sheet of steel that has been coated with a thin layer of zinc oxide. ... Galvalume metals are made with steel panels having a coating of corrosion resistant aluminum-zinc alloy applied by a continuous hot dip process.
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Hunt Stoddard
Da Kine

412 Posts

Posted - 04/08/2019 :  01:12:01  Show Profile  Reply with Quote
Replacing all the screws with stainless from HPM isn't all that expensive a propositions. You're looking a few hundred dollars, depending on the size of your roof, of course.

I've had good luck with steel brushing rust, then using Rust Destroyer primer from HPM. It's the red, expensive primer, $26 a spray can at HPM or $20 on Amazon. You can also get the brush-on variety, but I find the spray convenient. You have to let it dry for a few days. It's an ugly blood red, so you'll want to top coat over it. The key to actually stopping rust is to clean nearly down to bare metal, no loose stuff. THEN prime and paint so no water or salt gets in. If you just paint over loose stuff, you're doing precisely nothing.
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Obie
Punatic

USA
3625 Posts

Posted - 04/08/2019 :  10:18:34  Show Profile  Reply with Quote
Try Albany County Fasteners :

https://www.albanycountyfasteners.com/

Fast Priority mail shipping, great people to deal with.When mailbox cluster boxes were being stolen nearby, I secured all of our cluster boxes with these. Locktighted in place.

https://www.albanycountyfasteners.com/Tri-Groove-Security-Nuts-s/1254.htm

I replaced all of my roofing screws with stainless.Used stainless deck screws too.
Alas they weren't lava resistant.
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Rob Tucker
Kama'aina

9756 Posts

Posted - 04/08/2019 :  10:52:33  Show Profile  Reply with Quote
Screws and bolts get a real break on shipping with USPS. A flat rate box can weight up to 70 lbs. That's a lot of screws and bolts. Online prices for screws and bolts are way cheaper than local.
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kalakoa
Motormouth

11958 Posts

Posted - 04/08/2019 :  12:43:49  Show Profile  Reply with Quote
A flat rate box can weight up to 70 lbs.

No weight limit on domestic flat rate box. Unless they've added one since the last time I shipped something. The "no weight limit" is printed on the box.
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kalakoa
Motormouth

11958 Posts

Posted - 04/08/2019 :  15:21:08  Show Profile  Reply with Quote
I sit corrected: new boxes state 70 pounds domestic, 20 pounds international.

Vintage boxes don't have a domestic weight limit. They're also a better grade of cardboard.
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Obie
Punatic

USA
3625 Posts

Posted - 04/08/2019 :  16:29:10  Show Profile  Reply with Quote
Albany County Fasteners ships in a reinforced envelope.The fasteners are in plastic bags in the envelope.
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terracore
Punatic

5701 Posts

Posted - 04/08/2019 :  17:15:25  Show Profile  Reply with Quote
"A flat rate box can weight up to 70 lbs"

70 pounds is the upper limit for any USPS item. Back in the day, I think it was the 1930's, that is the amount they determined any "mailman" could drag to the customer. UPS and FedEx limit is 150 pounds, due to various regulations. Beyond that they will ship higher weight but only as "freight".
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Durian Fiend
Kamaaina

USA
504 Posts

Posted - 04/16/2019 :  18:53:59  Show Profile  Reply with Quote

With the screws, eventually the rusted heads will shrink in size and you will not be able to remove them easily with a screw gun. Although stainless aren't necessary they are a safe bet.

I've had non stainless screws that have lasted for a couple decades and others that have completely rusted out in less time. Depends on how they are coated, I guess.

With the roof panels you could always reverse the direction of them and put the good end as the new drip line, after pulling them up and treating the rusty edge.
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eigoya
Da Kine

USA
467 Posts

Posted - 06/11/2019 :  16:40:52  Show Profile  Reply with Quote
I am revisiting this topic as I would like to understand all the options for our old, rusty outbuilding roof. It is not connected to the catchment, but I "think" I'd like the option to add an additional tank (at a later date). The area is about 500sf, and we have already "osho"ed it but it is now crumbling on some ends. The lengths are 20' which are much longer than the ones I saw online HD. So, As I understand, I can:

1) paint with GACO from HPM and later add gutters and spare catchment. 2) reroof with galvanized steel (no painting necessary?) or the higher priced product Rob recommended (prices?). With either of these, replace screws with the online version. Any input on price v durability v anything I'm not considering is greatly appreciated Also, If you put new metal roof on old rusty one, is that hastening decay? Any other options?

Edited by - eigoya on 06/11/2019 16:42:33
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