Roof Membrane

Scott from California asks: I recently had my concrete tile roof inspected and was given a short list of recommended maintenance actions. Among these was to “install pressure sensitive weather blocking material at transition areas.” Following this recommendation resulted in what is shown in the attached photos. The roofing company has since painted the tape (referred to by the roofer as a “membrane”) to more closely match the tile color. Question: Is applying this ‘membrane’ standard practice on a roof that’s never experienced a leak of any kind? The community where I live has 800+ homes, all of which have tile roofs, and I’ve never seen tape/membrane used like this. What would be an alternative to using tape to achieve the same level of waterproofing protection w/o impacting the curb appeal of my house?

Hello Scott,  

Below is what our roofing expert had to say in response to your question:

Hello, my name is Ruben, and I’m a Senior Estimator with Antis Roofing & Waterproofing. I appreciate you reaching out with your questions regarding the recommended roof maintenance and the membrane installed at the tile transition areas. I’d be happy to provide some clarification. 

The use of a self-adhering membrane at certain tile transitions, including mitered rake and ridge termination areas, can be an accepted roofing practice and is intended to provide an additional weather-resistant barrier at areas that can be vulnerable to wind-driven rain.

However, it is not necessarily a requirement on every concrete tile roof, and the fact that a roof has never experienced leakage does not by itself indicate that this type of membrane is required. Concrete tile roofs can utilize different methods of detailing these transitions depending on the original installation and the tile manufacturer’s requirements.

There can also be alternative methods of detailing these areas, including properly installed mortar or other manufacturer-approved materials, depending on the specific tile system and transition being addressed. The important consideration is that the alternative provides the required weatherproofing and is compatible with the existing roofing system.

Regarding curb appeal, I understand your concern. A properly installed and finished transition should generally be integrated into the overall appearance of the tile roof, and painting the membrane to match the tile is one method of making it less noticeable.

Based on the photographs alone, I would not consider the use of a self-adhering membrane at these specific transition areas to be inherently improper or unusual. At the same time, I would not characterize it as a universal requirement for all concrete tile roofs in California.

The primary question is whether the membrane was necessary at the specific locations identified and whether it was installed in accordance with the applicable roofing system requirements.

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