Re-sealing fibrelass roof to asbestos panel

lesley karen · 17 Sep 2008

Hi, We had a fibreglass roof put on our garage & over the front door about 8 years ago but the sealant has perished. Our 1920's, square bayed semi has that mock tudor frontage (black& white). The large white panels are asbestos which are painted with emulsion, the black is wood painted with gloss. The fibre glass roof buts up to the asbestos panel & wood frontage, (this is where the sealant has perished & come away). The gap aginst the asbestos is probably about 2.5cm & the wood 0.5cm

Can anyone please tell me the right sort of mastic/sealant to use to reseal it which will stick to both the asbestos & wood aswell as the fibreglass.

Any suggestions would be much appreciated

Thanks

^woody^ · 17 Sep 2008

I don't think a sealant is going to be much good if the gap is 2.5cm. It will do but you will use a lot of it!

You may need to use something like Flashband to cover the gap and a suitable sealant like Roofers Mate to seal it.

Xenon · 18 Sep 2008

Get a proper mastic company round, they will probably use Arbosil 1081 or similiar, and have no problem filling an inch gap.

libby lou lou · 18 Sep 2008

Reading both posts, have times changed woody?

^woody^ · 18 Sep 2008

Yes times have changed and sealant improved there are many modern sealants that are gap-filling. But as this was a DIY question, then the OP will need a few tubes of quality sealant, or less sealant and an additional means of covering the gap.

Edit:
I've just googled that Arbosil 1081 product and it seems to be just a normal silicone sealant, but mainly recommended for sanitary use - also many glass and koi carp suppliers are selling it! So maybe not the best one for this job?

SurreyRoofingEstimator · 18 Sep 2008

How about using a polyurethane expanding foam tape, we've used this to good effect when a Velux foam filling has disintigrated.

Xenon · 18 Sep 2008

Edit:
I've just googled that Arbosil 1081 product and it seems to be just a normal silicone sealant, but mainly recommended for sanitary use - also many glass and koi carp suppliers are selling it! So maybe not the best one for this job?

Yes it is, due to being LM and its bonding qualities

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Re-sealing fibrelass roof to asbestos panel

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