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Flat Metal Roof Rusting. How do I repair?
Hi guys,
We have a flat metal roof, I'm assuming galvanized steel maybe, but it's now got a fair bit of rust with some minor sections rust holes. A couple of years ago during the floods (NSW), we had water coming in behind a wall & after investigating I noticed there was a large enough hole that the water was flowing along the roof (roof has slight angle to move water) and down the hole. i ended up getting some silicone and bogging it all up. Probably not the correct thing to do but I'm clueless & it was more of an emergency patch considering the weather.
Anywho, I'd like to get up there, treat the rust and coat the roof, though I don't know where to start or what correct procedure would be. I was considering getting the pressure washer out, hosing it down, scuffing back the rust to knock the loose stuff, then mixing up some rust converter in a spray bottle and trying to neutralize the rust then paint over it. Not sure if this is correct, so hopefully someone can point me in the right direction.
I considered replacing the sheets but it worked out to be thousands just for the sheets (roughly 100m2). Are there any 'clearance' or 'excess building material' type places that sell good condition stuff at discounted prices? (NSW)
I've attached some pictures for reference. The image with the green pipe, there's a patch there which appears to be a sheet of lead :?, assuming someone's installed it in the past. This was split and a fair bit of water was going through there during the heavy rain. You can see where I bogged it up with silicone which helped. There's another images with a couple of spots of silicone too, that appears to have rust holes. Another image has a possible screw hole, not sure what it is, assuming water will be able to get in there.
Any tips on how to tackle this?
Thanks,
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