Roofing Valleys and Gutters

https://www.thespruce.com/difference-between-closed-and-open-valleys-2902130
Closed valleys use an additional metal layer, and remove shingles from overtop it. They’re more expensive and uglier, but work better.

https://www.guttersupply.com/blog/when-you-should-be-using-half-round-gutters-vs-k-style-for-your-home/
Half-round gutters are harder to install and uglier, but work better than boxy K-style gutters.

https://www.roofingcalc.com/galvalume-vs-galvanized-steel-roofing/
Galvalume lasts longer than hot-dipped zinc galvanized.

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