[Craig 72]

Hi folks,I wonder if anybody can offer any assistance?I’ve had so many customers ask me if I do roof cleaning that I took the plunge about a year ago and gave it a go.So far so good but on a job today I got to a section of roof on an outbuilding where there is an area of clay tiles that is very flaky and looks fragile.I daren’t scrape them as I thing they’ll disintegrate.There’s still a lot of moss on the area,I suggested to the customer that I just sprayed it with biocide  rather than scrape and then spray.Customer seemed happy with that but it’s going to look crappy as the rest of the roof is scraped fine.This is the only course of action I’ve got presumably?Any idea on how long a biocide treatment would take to work it’s magic on an area that’s not been scraped first?I’m thinking a long time 😩.Thanks if you can help.

[Craig 72]

[Craig 72]

Crappy pic 😩.Rest of the roof is fine bizarrely,there’s just  a stretch like this about 2 metres long

[Splash & dash]

Biocide or hypo will kill it and over time it will naturally come off the roof but take 8-12 months depending on a number of factors.

[Smudger]

Most likely frost damaged - biocide will help but I wouldn't be confident that its going to kill it off properly, sometimes a roof requires more than a clean and this would be one where I'd suggest a roofer and change these tiles

Darran

[Craig 72]

Many thanks 👍