How Long Does Roofing Felt Last Under Tiles?

If you’ve had your roof for a while, or you’ve moved into a new home, you might be wondering about the life expectancy of your roof. More specifically, as well as the tiles which people tend to think of first, you might wonder about the roofing felt. In this blog, we look at what roofing felt is and how long it lasts underneath tiles.

What is roofing felt?

Roofing felt, otherwise known as roofing underlay, sits underneath the tiles or slate on your roof and secures them in place. The felt is laid on the top of the supporting rafters and beneath the tiles or slate battens. 

It is mainly used to secure the tiles on the roof and counter any shifting impact that strong winds may have on them. It also offers protection against heavy rain as it provides a barrier, allowing rain to run off the roof and preventing it from seeping into the internal spaces of the roof and your home. Finally, it adds an extra layer of insulation to your home to stop heat from escaping.

How long does roofing felt last under tiles?

How long roofing felt lasts underneath your tiles will depend on the type used. You can expect traditional roofing felt to last for about 30 years, although this will depend on the conditions it’s exposed to. Other modern alternatives tend to be more durable, although they’re usually more expensive.

When you get your roofing felt replaced after it runs its course, you should opt for a breathable underlay as these are a much better replacement for traditional felt, which can cause condensation.

How do you tell if your roofing felt needs replacing?

If your roofing felt becomes damaged, it will no longer offer adequate protection to your home and will need to be repaired or replaced.

The most common sign that your roofing felt needs replacing is if you begin to experience leaks after periods of heavy rain. As we mentioned previously, one of the main purposes of roofing underlay is that it creates a barrier on top of the internal roofing structure. Once this is broken in any way, you will likely start to see water escaping into your home.

Another sign that the roofing felt has deteriorated is if tiles start to become dislodged more easily. This means that the tiles can no longer be secured by the roofing underlay.

It’s important to note that replacing roofing felt or underlay is a significant task and it should only be undertaken by roofing professionals. This will ensure that the correct material is used and fitted to your roof as required to protect your home from wind, rain and other conditions.
If you are based in Devon and think that the roofing felt under your tiles needs to be replaced, please do get in touch with us for a quote or give us a call on 01392 243000.


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