M ETAL R OOFING : C HAPTER 2 A F AMILY OF P RODUCTS / H ISTORY OF M ETAL R OOFING 2. METAL ROOFING: A FAMILY OF PRODUCTS / HISTORY OF METAL ROOFING When installing a m etal roof , it is important to realize that a system of individual components is being installed that are related to each other , and that depend on the appropriate installation of each part in order for the system to perform correctly. Understanding t his "family of products" and how they're related will make any installation job easier , safer, and less confusing. Metal roofing has always been considered a premium roofing material. A brief look at how metal roofing developed over the centuries will help the installer understand why and how various roof style s, type s of panel s, material s, and seam methods we are developed. Each was developed to solve a roofing problem. S ome we are developed to meet unique roofing situations

2 1 Metal Roofing : A Family of Products A typical metal roof system is composed of five primary components an installer needs to consider in any application. They are: o Substr ucture o Roof panels & trim o Fasteners o Common roof accessories o Support structure The substr ucture is the foundation, or base, to which the top roof panel is attached. Think of it as the first thing that's found when the roof's top layer is pull ed back. The two main types of substrates are called solid deck and open framing (Figure 2- 1). Decking material may be either wood or metal , and some substrates may have rigid insulation. Solid Deck Substrate Open framing Substrate Figure 2-1 Types of Substrates Ro of panels and trim make up the top layer of the roof and are directly exposed to the weather and the environment

These products can be made from : o Natural metal s o Aluminum o Copper o Zinc o Alloys o Aluminum/Zinc o Stainless Steel o Metallic coated materials o Galvanized o Galvalume (R) They may be in the form of sheets, panels , or smaller individual pieces, much like traditional asphalt shingles , wood, slate , or tile facsimiles. The sizes and shapes of metal panels and trim pieces may vary w idely , however are light in weight, and usually easy to install. (Figure 2- 2) Most panel styles and varieties are available painted or unpainted. Figure 2-2 A Standing Seam Roof Panel 2-1 M ETAL R OOFING : C HAPTER 2 A F AMILY OF P RODUCTS / H ISTORY OF M ETAL R OOFING Installation of a metal roof requires the use of a variety of styles and types of fasteners and or clips. These are the components responsible for keeping the roof on the structure. Examples are shown in Figure 2- 3a and Figure 2-3b

The exact style and size of the fastener will depend on the roof panel to be installed, and design requirements of the roof. A roof installed in a high wind zone will require a different fastener and spacing than one installed in a milder environment. Other considerations , such as snow and ice loading, and building codes , may also change the type and amount of fasteners and clips required for any installation. Figure 2-3a Typical Fasteners Figure 2-3b Various Clip Examples Common roof accessori es will be a part of every installation. Every installer needs to be familiar with such common accessory installations as vents, curbs, and pipe penetrations. Depending on the job or location, the installer will also need to be familiar with installation of accessories like skylights, snow guards, and solar panel mounting

Be aware that some of these accessories will require fasteners that may not be a part of a standard roof installation