sealant for leaky roof

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1101

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Uber Geek

#295629 11-Apr-2022 09:38

I need to fix some roof leaks .
Whats a good sealant for a old metal tile roof ?
Silicon Sealant doesnt seem to stick that well to it for some reason .
Roof tar ? , some sort of chalk ?

I'll be up on the roof this weekend doing some maintenance
Cheers

eracode

Smpl Mnmlst
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#2899727 11-Apr-2022 09:45

I wouldn’t automatically resort to sealant unless you’re sure what the problem is and where on the roof it’s originating. Maybe you already know all that - but that’s not indicated in your OP. If you don’t know, investigate first and then you’ll have a better idea what type of fix is needed. It may not be sealant that’s required.

Very often a leak originates a long way away from where it shows up in the house.

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Gurezaemon

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#2899728 11-Apr-2022 09:50

Get some Sika BlackSeal or other bituminous sealant.

It's unpleasant to work with, but it sticks like sh!t to a blanket and dries hard enough to be durable, but still flexible enough for a bit of movement.

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elpenguino

3424 posts

Uber Geek

#2899735 11-Apr-2022 09:56

Have a look for rusty tiles.

There are some tarry type goops out there but they'll only provide temporary relief while the rust worsens elsewhere (if that's your problem).

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

elpenguino

3424 posts

Uber Geek

#2899749 11-Apr-2022 10:56

Gurezaemon:

Get some Sika BlackSeal or other bituminous sealant.

It's unpleasant to work with, but it sticks like sh!t to a blanket and dries hard enough to be durable, but still flexible enough for a bit of movement.

you can say that again - I used some recently and I had to use my free hand to pull the brush off the glove in my other hand.

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

Bung

6487 posts

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#2899765 11-Apr-2022 11:17

The roof can be quite rusty without it actually being perforated. This roof is probably leaking because a lot of the nails on the edge of the tiles are loose and the water gets blown back along the nail.

mdf

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#2899778 11-Apr-2022 11:39

Depends on what is causing the leak. Flashtac tape is my usual go to for roof leaks, but only after treating rust, dealing with popped nail heads etc.

pulsta

164 posts

Master Geek

#2899790 11-Apr-2022 11:53

I was recommended Coltogum by a roofy about 6 years ago to fix some leak issues around my Apartment deck and roof and was so impressed it's the only thing I use now. It's a grey coloured paint that containes glass fiber so it needs a good stir as it goes on thick.

https://www.reptech.co.nz/products/coltogum-water-stop-750ml-1

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mattwnz

20164 posts

Uber Geek

#2899846 11-Apr-2022 14:16

Sealant will eventually fail, so sealant should never be used as the primary way to keep water out. If it is leaking turf you need to find out why and fix it properly.

1101

3122 posts

Uber Geek

#2900318 12-Apr-2022 11:42

mattwnz: Sealant will eventually fail, so sealant should never be used as the primary way to keep water out. If it is leaking turf you need to find out why and fix it properly.

I dont have $10K (?) to have the 1960's roof fixed properly. ie replaced
Its also a bad design and thats part of the issue.

on very very heavy rain , the roof channels cant cope, a 1960s design issue not easy to explain . Sealing will certainly help .
Usually leaks not a issue, just on out of ordinary extreme rain .

Are also a few places that need a small spot fix .