Repairing roof sheets

[cb387]

Grain store is 40 years old and starting to get a few small holes in it. Its not really bad enough to replace the whole thing just yet but needs attention. We have replaced a few sheets over the years but it’s not a job Im happy doing anymore.

Has anyone found any good roofing compounds / patches etc for sealing holes - ideally from the inside?

 

[solo]

Flash band is reasonable but has to put on from topside
grp sheets can be cut and slid up under the sheet with the hole so it channels the water onto the sheet below. Has to be long enough to span the purlins.

 

[Sir loin]

Flashband comes with a tin of liquid that you paint onto the roof sheet then you cut flashband into 4" lengths warm with a heat gun and stick it Used it very successfully though did mine on topside as solo said. But I would give it a go underneath it will not break the bank and see.

 

[Nearly]

@grainboy

 

[grainboy]

Similar to another thread, replacing roof sheets,
You’ll be for ever chasing the leaks,

 

[cb387]

Thankyou for the suggestions. Will try flashband

 

[homefarm]

We use sheets like in the link below.

CLEARANCE GRP 6ft Translucent Big 6 Fibre Cement Profile Roofing Sheets

Replacement Rooflights for Fibre Cement Sheeting Our Translucent sheets are made from high-grade GRP glass fibre of 1.5mm thickness, offering extremely high impact resistance that minimises the risk of damage. GRP roofing sheets let in diffused daylight at a transmission rate of over 80% and...

www.cladco.co.uk

We work from below. Cut the fixing around the hole with a reciprocating saw till we get enough movement to slide a piece of the above cut to size to cover the hole and reach the gutter or next good sheet. Then replace fixing from above, with maybe an extra one to catch the repair. One sheet can repair many small holes and we find they never leak or drip.

 

[Highland Mule]

Acrypol + Waterproof Roof Coating 5kg Grey

Acrypol+ is a total roof coating waterproofing system developed to refurbish failed industrial, commercial or domestic flat roofs.

www.travisperkins.co.uk

 

[Sid]

Acrypol + Waterproof Roof Coating 5kg Grey

Acrypol+ is a total roof coating waterproofing system developed to refurbish failed industrial, commercial or domestic flat roofs.

www.travisperkins.co.uk

Also use something similar on concrete gutter joints

 

[Agrivator]

With flashband, always wear disposable gloves, especially if you're going out later.

And a small wallpaper roller is useful for pressing it down evenly.

 

[thorpe]

Acrypol + Waterproof Roof Coating 5kg Grey

Acrypol+ is a total roof coating waterproofing system developed to refurbish failed industrial, commercial or domestic flat roofs.

www.travisperkins.co.uk

is this product any good? we need somthing to seal joints in a steel vally gutter.

 

[Highland Mule]

is this product any good? we need somthing to seal joints in a steel vally gutter.

Roofer mate used it quite a bit and thought it decent for flat roofs and the likes. It’s sticky stuff to apply, from memory, but never used it on anything of my own.

 

[DrWazzock]

is this product any good? we need somthing to seal joints in a steel vally gutter.

We have the same problem with a steel roof valley. Was galvanised, now perforated. I tried something similar to Acrypol (Flexacryl?) but the rust continues and tends to force it off. Apparently I should have painted it with a rust inhibitor first then painted on the Acrypol. Will try again this summer. Almost worked, but in reality I think I need a new valley.

 

[thorpe]

We have the same problem with a steel roof valley. Was galvanised, now perforated. I tried something similar to Acrypol (Flexacryl?) but the rust continues and tends to force it off. Apparently I should have painted it with a rust inhibitor first then painted on the Acrypol. Will try again this summer. Almost worked, but in reality I think I need a new valley.

thanks for the comment waz , i think ill give it a go its only the joints , it was a crap job from new not enough support.

 

[fermerboy]

We have the same problem with a steel roof valley. Was galvanised, now perforated. I tried something similar to Acrypol (Flexacryl?) but the rust continues and tends to force it off. Apparently I should have painted it with a rust inhibitor first then painted on the Acrypol. Will try again this summer. Almost worked, but in reality I think I need a new valley.

Valley gutters are the work of the devil.
I've tried many potions and paints but the only solution that lasts is a proper gutter liner.
I have 4 from here and they are spot on.

Market Leading Gutter and Roof Refurbishment Systems

Sharmans roof and gutter refurbishment systems are engineered to prevent leaks and extend building life cycles in the commercial roofing sector

www.hdsharman.co.uk

 

[DaveGrohl]

If the holes are fairly minor we just use rooflight cut to size and glue on undersize with wet grab glue stuff. Very Heath Robinson but works generally.