How Long Does Roofing Felt Last Under Tiles

Over a long period of time the tiles slate move vibrate in the wind up and down and hit the top of the fascia board and some times cut the felt at that point this done it allows water penertration via wind movement to ingress to the timbers inside and you know what that means one of the best and secure.

How long does roofing felt last under tiles.

Hi sarking felt is the endthat lapsover into the guttering to allow water run off. Roofing felt that has gotten wet can be covered with shingles as long as it is allowed to dry out first the surface underneath did not get wet and it did not wrinkle bubble or rip. How does a standard roof underlayment last. The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection.

The felt roof underlay is secured by nailing direct to the rafters and then held by the battens which will be fitted to secure the tiles or slates too. Two layers of astm 30 pound asphalt impregnated felt is the minimum you should use under tile and should last 20 to 30 years. You can expect traditional roofing felt to last for about 30 years although this will depend on the conditions it s exposed to. That s the headline quote but as we ll soon see this can vary a lot depending on a number of factors.

In the course of the water leaking through my roof onto the ceiling of a room i have been told that the roof felt underneath the concrete roof tiles is obviously the original felt ie 1970s and has gone brittle and awful with age and will need replacing entirely. 30 roofing felt is far better than unrated 30 pound felt which may weigh as little as 15 20 pounds. 15 pounds per hundred square feet and 30 pounds per hundred square feet. In the early days 30 pound felt was the most common underlayment used under tile roofs.

This underlayment is far superior to a 30 pound felt and is warranted by the manufacturer for up to 20 years if installed by a tile roofing institute certified contractor. The general estimated lifespan of an underlayed roof is normally around 25 years. While clay tiles are available in a host of earthy colors this roofing is best known for its bold terracotta tones extremely popular in the southwest. For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights.

Other modern alternatives tend to be more durable although they re usually more expensive. As the sarking felt can be easily damaged by strong winds it is advisable to wait for a period of time where the felt and battens can be fitted in quick succession during fair conditions. How long does roofing felt last under tiles.