What Are Roof Valleys? Everything You Need To Know

Roof valleys are the “V” shaped guttering like metal material running up and down the folds where two parts of a roof meet. If you need excellent Cambridge roofers, we can install any kind of new roof, with or without valleys. Or make any repairs you need!

Roof valleys are important because, without them, these gaps where parts of the roof meet would get flooded. There’s so much space and cavity room for water to get in there. This would lead to a disaster with your roof. Before long, your entire roofing setup will be a wet, infested mess. 

Also, think about the water drying and expanding where the roof meets. Destruction would ensue.

As such, we use roof valleys to essentially protect and drain away from the crevices created by the shell of our house

What else do roof valleys use?

Roof valleys also benefit from having extra underlayment lining. Some water might slip through and some condensation might be created, so it’s best to have extra layers covering whatever kind of tile you have under your roof.

Do the valleys require roof flashing?

Roof flashing is thin material that tradesman use to redirect rainwater away from areas of a roof. For example, many ask if flashing is used on roof valleys. They can be, but generally they aren’t. Instead, we use the underlayment described above. 

Usually, roof flashing is made from galvanised steel. It’s normally used to protect really vulnerable parts of the roof, like chimneys, skylights and air ventilators. Water is funnelled away from the valuable point and down the shingles instead of sitting on the roof.

What is a closed roof valley?

In the world of roof valleys, we have both closed and open valleys to consider. A closed valley roof is exactly that – closed. The method of closing is to first install the underlayment over the roof reck and before the shingles are laid. The underlayment acts as the valley lining as described above. For a closed roof, the roofer will then lay shingles over this underlining so as to “close” off the valley. This part of the roof is effectively like any other because it’s been closed off by the valley.

What is an open roof valley?

Described at the start is an open valley roof. Instead of just covering the area with shingles and an underlayment – the extra metal gutter like material is laid between the crevices to create more protection for that area of the rain. Ideally, your roofer will pick a material like steel, aluminium and copper so that it doesn’t rust and is very strong. 

Which is better, an open or closed roof valley?

This comes to personal preference. While the closed valley looks less good – because you don’t get the cool metal running down the side of your building (personal preference though) – you save costs of using expensive metal.

So it’s a bonus if you don’t like the look – because it will save you!

Aesthetics is big though. If you like the look, a nice copper open valley works great. 

Another consideration is utility. If your roofer recommends that you should go for a closed valley because it’s easier? Then it\’s best to go with your roofer’s suggestion! 

That’s it for now guys. If you want to speak to us about getting your valleys done to improve the durability of your roof… Just give us a call! We are local roofing contractors with a knack for creating useful, reliable and lasting roofs!

If you want to see other highly rated contractors in Cambridge, check out the best rated by this site. We hope to be in there one day!