DIYbanter - View Single Post - Can you push a spiral drain unblocker up a downpipe from below?

alan_m

On 07/04/2018 12:33, wrote:

When I inspect the gutters what I find is not just small amounts of
vegetable matter, but what could be sand or other mineral material. Is
it possible that concrete tiles weather and the surface slowly wears
away? These tiles are just over 50 years old.

Definitely. And they wear faster on shallow slopes due to more freeze-thaw damage.

Made worse by having established moss which retains a large amount of
water which can freeze. The freezing results in shallow pits in the
tiles which in turn provide the ideal conditions for moss growth. More
moss = larger pits = more moss. Not helped if colonies of pigeons use
local roofs as their daytime perching waiting for neighbours to throw
out food waste.

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