COMMERCIAL METAL ROOFING
Fiddler’s Roofing offers an exceptionally broad range of commercial metal roofing. For over 17 years Fiddler’s Roofing has been bringing the best of metal roofing applications to projects throughout Central Florida.
There are two different types of metal roof applications: low-slope and steep-slope. There is only one type of metal roof system used in a low-slope system — structural metal panels. Structural metal panel roof systems are used for low slope roof systems because of their water retardant characteristics. Structural metal panel roof systems may also be installed for steep slope roof assemblies. Most structural metal panel roof systems are designed to resist the passage of water at the joints and because of their hydrostatic, or water barrier characteristics. Structural metal panel roof systems possess strength qualities that allow them to span supporting members. One downfall to these applications is that condensation may develop on the underside of the metal roof panel. Conscientious thought should be taken when deciding on the other components of this type of system including the vapor retarder, insulation, and ventilation.
Structural metal panel roof systems are installed over a large variety of substrates. There are two general categories of substrates: one is continuous or closely spaced decking that provides solid support for the metal roof panel, and the other is composed of spaced structural supports (such as purlins) where the metal panels must span between supports. Most structural metal panels are used over spaced structural supports without being supported by a solid roof deck.
Underlayment (or “felt paper” as it is frequently called) is installed over the roof deck before the application of a metal panel roof system. An underlayment performs two primary functions: it provides temporary weather protection until the metal panel roof is installed, and it provides a secondary weatherproofing barrier if moisture infiltrates the metal roof panels.
Underlayments typically are not used with structural metal panel roof systems when intermittent supports are used to carry the roof systems. However, if there is a continuous or closely spaced roof deck, NRCA recommends an underlayment be installed. If an underlayment is to be installed, NRCA recommends a minimum of one layer of No. 30 asphalt-saturated felt or synthetic felt be applied horizontally in shingle fashion on roof decks having a slope of 4:12 (18 degrees) or more. For roof decks having slopes of 3:12 (14 degrees) up to 4:12 (18 degrees), a minimum of two layers of No. 30 asphalt-saturated underlayment or synthetic felt should be applied horizontally in shingle fashion.
There are three basic types of metal roof systems used for steep-slope roofing applications: architectural, structural and metal shingles. Architectural metal panel roof systems are water resilient and are intended for use on steep slope roofs. Metal shingles and shingle panels are available in various options. Most of the metal shingles are press-formed during the manufacturing process to provide a variety of shapes. These shingles and panels can take the shape of individual or multiple asphalt shingles, tile, slate or wood shingle designs.
There are many metal panel profiles available. The architectural standing seam profile is the most commonly used profile in the commercial market. Metal roofing is often thought of as the king of all roofing materials. The typical life a metal roof will generally always exceed that of a composition roof. Regardless of an architect, engineer, or owner’s choice a metal roofing application will provide a unique look for any structure. Vapor retarders, insulation and ventilation Condensation should be expected to develop on the undersides of metal roof panels. Careful consideration should be paid to vapor retarder, insulation and ventilation issues. Because every building is in some way unique, building owners and designers may need to consult moisture-control specialists.