On 05/03/2014 10:00, Andrew Gabriel wrote:
In article ,
Tim Watts writes:
On 05/03/14 09:02, Brian Gaff wrote:
I dunno but after getting new plastic guttering, there is snap crackle pop
from that on hot sunny days and as it coold s in the evening.

That can be cured with a little silicone grease on the joints (plumbers
grease).

You can get plastic guttering with a white inside, which significantly
reduces this. I've no idea what the make is, but it's what my brother's
roofer used. Also came with protective film on the outside which you
peel off after fitting, to preserve the high gloss finish.

My first thought was that this would lead to differential expansion on
the inside and outside and hence warping. I assume this is not the case.