Valley - What type?

[boxrick]

Hello folks. I have a roofer due to come today and I ordered a "closed dry valley" system.

 

My worry is I'm surrounded by trees and this will get clogged and full of junk.

 

I can get something like this GRP open dry valley locally and collected easily or I can opt for something like a Kytun Aluminium valley which will take 2 weeks to come.

 

https://www.travisperkins.co.uk/fibreglass-valleys/danelaw-group-tile-valley-trough-grey-380mm-x-3m-rp3/p/915427

 

I can't really see the valleys from ground level so this is all about performance.

 

Any thoughts on what I should do?

 

 

[nod]

I’m not a fan of closed valleys for the reasons you have stated 
I’ve used lead on our builds Lead will outperform anything else 

[boxrick]

The roofer suggested lead valleys too. Think that's probably the way forwards!

 

Cheers for the extra input.

[flumpery]

Another point for consideration is if you wanted to collect rainwater run-off, as lead does contaminate. You can opt for dry fix GRP valleys, where no mortar is required and it doesn't result in contamination?