Bostik Flashband Self Adhesive Flashing Tape for Roofs Grey - 225mm x 10m - Provides an Instant Watertight Seal

very sticky, worked well on the shed roof when putting felt on, should keep it water tight.

Used this to stop leaks in my summerhouse, much cheaper than Lead flashing and it’s self adhesive.

SITUATION: I used this product to seal a plastic (polycarbonate?) Corolux roof to two exterior painted brick walls. The previous seal had failed after many years service. The work was done in cool but dry autumn weather. I am a time served DIYer but a first time user of Flashband.PREPARATION: I cleaned off the old sealant mostly with a scrapers. I filled mortar joints where mortar had come away and other indents in the brickwork with two pack Ronseal polyester filler to get a new surface quickly. In some places I had to dry out the brick work with a hot air blower to get the filler to stick well. Afterwards I sanded the filler to a flat surface. I primed the area the Flasband was to cover with the Bostic primer which i think was essential to get a good bond.APPLICATION: Putting the Flashband in place was easy as it is vey forgiving so it is easy to keep in a straight line. I used a roller to press every section in place. That cured 99% of the leaks I had previously.REFINISHING: I went back over all of the Flashband with the roller and gentle application of the hot air blower. I could immediately see that the bonding was better all round especially at the edges. i would always do this except perhaps in hot weather as i then got 100% dryness.RESULT.: Easier to used and better than i could have hoped for. As usual preparation was most important and takes longest.

I cannot express how fantastic this product is. I used it to add extra waterproofing to a sauna roof and it worked a treat. You MUST use a heat gun to apply otherwise the tar adhesive won’t stick, although u was applying in winter. The material is very flexible and has a thin layer of metal inside which makes it look just like led. Love it.

Fast sticking, good watertight seal

Fantastic stuff, used to seal an old plastic sheet roof, easy to use.The roof is now waterproof and has been truly tested (after 48hrs of rain ).Very happy with the product

This product would not stick no matter what was done very disappointed waste of money this is terrible would not stick no matter what we done wouldn’t recommend waste of money

Great stuff. Used it to seal a gap in my guttering. Sticks well and is strong stuff. I'd buy it again.