Felt Under Roof Tiles

As stated in best practices guide to residential construction.

Felt under roof tiles.

The first thing is synthetic roof underlayments have a uv coating. Two layers of astm 30 pound asphalt impregnated felt is the minimum you should use under tile and should last 20 to 30 years. So you can leave it uncovered on your roof for up to 180 days. Many contractors prefer a temperature resistant self adhering underlayment such as tarco ps200ht high temperature underlayment which is designed for use under metal and tile.

But what some may not know is there s another layer of protection directly on top of the roof deck and under the roof covering that performs a critical role in protecting your home from moisture damage. Item 656632 model 0903000. The roof deck should be sound and level before laying the underlayment. 30 roofing felt is far better than unrated 30 pound felt which may weigh as little as 15 20 pounds.

The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights. 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.

In florida hot mopped asphalt in 90 felt was the benchmark underlayment for tile roofing systems for many decades and is written into many of the building codes. Is synthetic roof underlayment better than felt. 15 pounds per hundred square feet and 30 pounds per hundred square feet. Synthetic roof underlayment is a lot better than felt.

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.