Underlayment, which is the best for my tile roof?

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 the worse compared to the ville profiles with humps and pans. This is one reason the battens have a space every four feet so water can escape down the roof instead of being trapped behind the battens. Having said that, you can imagin the underlayment is more important than if you are using another roof product like asphalt shingles.
Tile roofs systems normally use a 36 inch felt. The popular type used is the #30 but the thinner #15 is available is an exceptable standard. I recommend the #30 at minimum but I ask you to consider double felting with the #30 or use synthedics.
tile synthedic felttile roof felt
tile repair

These photos are of a tile roof with a shake profile that, after 11 years has leaking issues. Here the tiles are being removed. And a new synthedic underlayment is being installed. We continued with flow through battens and then reset the old but useful tiles..
I have gone as far as installed Dibetin torch down roofing systems proir to 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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About author

Bob 270 posts

Since 2005 Bob has been answering questions, free of charge, here at AskARoofer.com. With a strong background in residential roofing and provides a practical and simple answers to hundreds of roof related questions, so it is easy to understand the issues you may have with your roof. Our answers are free so feel free to ask what you want. Use the green question box to contact myself or AskAroofer.com I have spent ten years as a union shingler, seventeen years as a California licensed roofing contractor with a general contractor endorsement and since Feb. of 2005 a roofing consultant. If I don't know the answer to your question, I will point you in the right direction.

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  1. Fast Eddie
    April 20, 11:58 Reply
    I want to use high grade underlayment under a tile reroofing, or even a double layer of rubberized material. Is it worth the extra cost . What product do you recommend? Is there an alternative to battens under the tiles; seems like they will trap water and debris to induce leaking.
  2. Bob
    April 21, 05:13 Reply
    I have used many and it depends on your budget when choosing the underlayment. Installing a elevated battens or flow through type, allows the water to flow freely down the roof without damming up behind the battens. Email me for drawings and more details if you want.
  3. Jim
    June 02, 20:26 Reply
    Hi Bob, I have observed the following regarding concrete tile roof installations: In New Mexico: on plywood decking, the Roofers apply a plastic or vinyl or PVC sheet, 5 or 6 mil, sheeting. Then battens are applied to that surface with nails through the batten and the sheeting. It seems to me that this rook cannot do anything but leak ultimately. The PVC sheeting is very thin, and obviously has NO ability to "heal" itself around the nails. Plus, the battens would "dam" any water that gets through the concrete tile laps. Is this a normal, recommended underlayment installation. Additionally, in Florida, on plywood decking the roofers have installed an underlayment that is about 1/8" thick, and manufactured with what appears to be a "lick and stick" adhesive surface material. This material appears to be a butylene type of flexible product that would appear to have some "healing" ability to seal the penetration of the nails holding the battens to the deck. This type of installation seems to affect a good membrane to create a no leak roof installation. NM is a very dry state. FL is a very wet state. I am considering a home with a pitched roof, however, want to make sure the roof tile installation system is correct. Any comments you have are greatly appreciated. THANKS, Jim Puckett

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