Underlayment - Which is the Best for My Tile Roof?

Underlayments are very important to consider.

Believe it or not, tile roofing systems will allow water to get below the tile and on to the underlayment. The flat tiles are worse compared to the valley profiles with humps and pans. This is one reason the battens have space every four feet so water can escape down the roof instead of being trapped behind the battens.

Asphalt based felt with battens

Having said that, you can imagine the underlayment is more important than if you are using another roofing product like asphalt shingles.

Tile roof systems normally use a 36 inch felt. The popular type used is the #30 but the thinner #15 is available is an acceptable standard. I recommend the #30 at a minimum but I ask you to consider double felting with the #30 or use synthetics.

I have gone as far as installing a torch-down roofing systems before the tile application.

The tile roofing system is all about the underlayments so use the best you can afford. The tile is there for looks and to protect the underlayment from the UV sun rays.

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