What Size Butyl Tape Is Used on Metal Roofing?

Appropriate Size

• Butyl tape is available in various widths, ranging from 1/4 to 8 inches. The size of the area in need of repair determines the size of butyl tape necessary for the job. However, a roll of tape that is 1 to 2 inches wide is usually sufficient for common jobs, such as patching small holes in a metal roof. Some manufacturers can create special sizes upon request.

Available Versions

• Manufacturers provide single- and double-sided butyl tape. The nature of the repair on the metal roof also determines the type of tape required. For instance, double-sided butyl tape is useful for joining single-ply roofing, while the single-side version is best for fixing holes on the roof surface.

Site Preparation

• Installers inspect the site for problems that could interfere with creating a weather-tight seal with the butyl tape. Any problems found must be fixed prior to applying the tape. Because butyl tape adheres to clean, dry surfaces, installers also must ensure that the work area is free of matter such as dust, grease and loose mortar.

Application

• A silicone-backed release paper protects the extruded rubber butyl tape. The installer can unroll the tape gradually, to apply the exposed surface of the sealant to the work area before removing the backing. The tape bonds to the surface and fills any minor irregularities in the metal roofing when the installer applies pressure. This creates a waterproof and airtight seal.