![]() One roof malfunction that can be easily avoided is the occurrence of ice damming. ![]() Source: Concrete and Clay Roof Tile Installation Manual for Moderate Climate Regions Design Criteria, by Roof Tile Institute and Western States Roofing Contractors Association Water will run under the flashing and into the deck penetration at this location.Įxample of correct penetration installation for tile roofs. Note the roof underlayment is run under the uphill side of the penetration flashing. In all of these cases, reverse-lapped underlayment and flashing interfaces can result in damaged components and can eventually lead to leaks.Įxample of reverse-lapped underlayment at penetration. At eaves, the underlayment should be lapped over the eave flashing in order to provide a continuous avenue for water to drain off of the roof. At rakes, the underlayment should be lapped under the rake flashing to prevent water intrusion from wind-driven rain and snow below the underlayment. It should also be mentioned that at penetrations with a width larger than 30 inches, installment of a cricket flashing is recommended to prevent snow and debris buildup. The flashing surrounding these large penetrations is made up of several pieces, so the same shingle-like lapping is essential at these locations. This technique is important at small penetrations, such as plumbing and roof vents, as well as at large penetrations such as skylights and chimneys. The underlayment should lap over the top of roof penetration flashings and under the bottom, creating a shingle-like order to ensure the water shedding capabilities of the underlayment. It is also important to pay close attention to the direction and order of lapping the underlayment with flashing, especially at roof penetrations, eaves, and rakes. However, leaks don’t always show up right away, even though deterioration could be occurring to the roof decking and other wood components. Water intrusion could eventually result in leaks into the residence, which could cause a substantial amount of damage. This is why any puncture or tear in the underlayment should be sealed so no water intrusion below the underlayment can occur. Tile roofs are unique in this aspect, as the primary drainage plane is the underlayment and not the top-most layer like other roofing materials, such as asphalt or wood shingles. Underlayment is a crucial component to the roof because it acts as a drainage plane for a water-shedding tile roof. Some local building codes may require two layers of underlayment be provided due to cold climate conditions or the low slope of a roof therefore, it is important to verify underlayment requirements before installation begins. The first issue to address is the proper protection of the roof decking and other building components through the application of a weather-resistive underlayment. But even with these established standards, tile roofs are frequently installed incorrectly, with mistakes that are repeatedly the same. Several industry standards have been developed and are used in order to assure quality installation of clay and concrete tiles, such as the National Roofing Contractors Association, the Roof Tile Institute, and the Western States Roofing Contractors Association. This article will provide tips on how to avoid common errors in tile installation.īuilding codes, including the Uniform Building Code (“UBC”), Building Officials and Code Administrators (“BOCA”), International Building Code (“IBC”), International Residential Code (“IRC”), and many local jurisdictions, provide prescriptive requirements for installation and flashing. As with any roof type, weather proofing and installation are keys to long-term performance. Available in a variety of styles and finishes, tile adds curb appeal to any home, be it American Colonial, Spanish Hacienda, or French Provincial. Tile roofs are strong, versatile, and durable. Tile roofs have been used for centuries, and with good reason. How to avoid common errors in roof tile installation ![]()
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