What is overlay roofing?

With all the rainy weather we’ve been having this spring and summer, preserving the integrity of your roofing is essential if you want your property to remain watertight. When it’s time to fix or replace a roof, it can be hard knowing whether to completely remove the old materials or not. One of the ways you can improve your roof’s weatherproofing is with an overlay rather than a total roof replacement.

But exactly what is overlay roofing? Here’s everything you need to know.

What is a roofing overlay?

Overlay roofing is a new layer of material which can be installed on top of an existing pitched or flat roof. It’s usually used to add more weather protection to the roof rather than removing the current materials and replacing them with something newer. Roofing overlays should only be used if the existing roof still has good structural integrity. Your contractor will conduct a thorough inspection before recommending this solution.

What’s the difference between a roof overlay and underlay?

A roofing overlay involves placing new roofing materials over old ones. On the flip side, a roof underlay is a protective material that’s been installed under the outermost layer. It often acts as an additional moisture barrier to protect the roofing timbers from leaks and water damage.

Are roofing overlays worth it?

Overlay roofing is often more cost-effective (lower upfront costs for materials and labour) and faster to install than a completely new roof, but it’s not the right choice for some homes. Overlays add weight to your roof, which can put strain on the structure while reducing the ability to inspect for hidden damage. Overlay roofing can only be done under certain conditions – typically when the existing roof is still in good structural shape without any water damage, rotting wood or sagging present.

How long does a roof overlay last?

Roofing overlays won’t last as long as a total roof replacement. Depending on the material chosen and state of the current roofing, they may last for around 10 to 15 years. This is in comparison to new roofs, which can last for decades. If you’re planning on staying long-term in your home, it’s worth exploring the costs of both options.

How much does it cost for an overlay?

The cost of a roofing overlay can vary between projects. Overlay roofing prices depend on the job complexity, size of the roof and materials chosen. It’s often around half the price of a full roof replacement, but it’s worth getting quotes for both solutions from your roofing contractor so you can compare options. Overlays may also result in further costs down the line if your roof develops issues with any materials remaining underneath this new layer.

Free roofing quotes in London and Surrey

Get in touch with Collier Roofing for a free roof inspection and quote in Merstham, Netherne on the Hill and nearby towns. To chat through your roofing options, contact us.