What can I use to seal holes in old fibrous cement roof panels?

[rcx132]

Hey hey, about to fit the fibrous cement roof panels onto the roof of my new workshop. The panels are taken from a my old workshop that got knocked down after a pickup truck drove into it. So there are old holes in the panels. What could I seal the old holes with?

I used to use this masonry sealant, it kind of does the job of silicone but is tougher: http://www.fosroc.com/product/show/nitoseal-ms60
But it's not UV resistant so turned to chalk after a couple of years. Maybe straight silicone would work as it's just small holes?

PS please no comments about asbestos. These are 1990's panels and I spoke with the manufacturer who says they are perfectly safe. Not all fibre cement panels contain asbestos.

 

[Cobbler]

Try CT1 from Buildbase if you have one near you. It's in a tube like silicone, but sticks better & is uv resistant. Failing that, Soudals fix-all from Screwfix, very similar stuff. The CT 1 I used to seal the gaps between the ridge tiles on my garage & it did that easily. The Fix-all I was advised to use that for sealing around the roof light on my campervan as it doesn't peel off like silicone.

 

[Bobtail4x4]

nut and bolt, with a washer. you can add sealant under the washer for effect.

 

[RussT]

I would use something epoxy based, devcon with some sawdust added or a wests epoxy kit with some filler added to give it some substance, or maybe just a tub of fiberglass body filler from halfords should be permanent enough

 

[123hotchef]

what bobtail said nut and bolt with sealant under the washer u could put a washer both sides if you are really anal

 

[Cobbler]

If you decide to bolt it look up 'spat washers' they are the washers to go under roofing nails on corrugated sheets. No reason why you can't use bolts through them. Make a permanent job then.

 

[Kent]

Acropol. Not cheap but fills good gaps and seals well.

 

[roofman]

Acropol. Not cheap but fills good gaps and seals well.

this stuff has got me out of pickles a few times when we have a pipe flange coming through the roof that cant take heat...also makes fantastic car underbody underseal, stays flexible

 

[addjunkie]

Leadmate works well!

 

[Parm]

How big are the holes ?

 

[Migmac]

We took the tin sheeting off an old hay shed years ago. We marked every sheet, we knew where every sheet went. When we built the new shed we used the same fixing holes. Time consuming but effective.

I would use bolts and silicon to fill the holes

 

[dobbslc]

We were still using asbestos up until 1999 in this country!

Try this stuff from screwfix, I've used it to seal my corrugated cement roof last summer and it seems to work very well. The cracks are the full length of the panels so it also seem quite tough and holds things together well.
http://www.screwfix.com/p/flashband-bostik-flashband-flashband-grey-10-x-100mm/57969

 

[Screwdriver]

We were still using asbestos up until 1999 in this country!

Try this stuff from screwfix, I've used it to seal my corrugated cement roof last summer and it seems to work very well. The cracks are the full length of the panels so it also seem quite tough and holds things together well.
http://www.screwfix.com/p/flashband-bostik-flashband-flashband-grey-10-x-100mm/57969

Yep, I used that stuff to repair a couple of largish holes in my garage roof. Fixed it probably ten years ago and no issues with it. I seem to recall using some goopy stuff with it which would have been whatever was recommended on the packet.

 

[rcx132]

I went for the Soudal because it's only small holes and because sealant sorted it last time. Will see how it goes.

 

[dannyp]

id just put some sealant on some short tek screws and poke them in the holes