When we bought his house almost 6 years ago several (20 or more) of the concrete roof slates were broken but still on the roof. Most were broken just above or just below the overlap point. Anyway as we hadn't sold the last house we could not afford to get a roofer in to do a proper fix so I glued them all back with a waterproof builders adhesive designed to stick to concrete.
The thing is they are still stuck back, in fact I have just stuck another one back that had slipped down from under the ridge.
What's the general opinion. Is my "temporary fix" storing up trouble or should I not worry about it as long as the roof does not leak, which it doesn't.
Whilst on the subject, the reason I noticed todays slipped slate was because I was up a ladder clearing out the gutters. Whilst at gutter level I could see just how heavy the moss covering on the rear elevation of the roof is getting. I have read in the past advise advocating both leaving it alone, as scraping it off does more harm than good, and that it must come off due to the harm the moss can cause.
What's your opinion? Scrape it off or leave it alone?
Mike