Every kind of roof needs some sort of frame to provide support and to attach it to the walls of the structure it covers. Metal roofs, which are made of overlapping corrugated metal panels, typically have wooden frames. A metal roof is highly durable, making it an appealing choice for sheds and other practical structures. Metal roofing is also an option for homes and garages when their design accommodates metal's modern, industrial appearance. Building a frame for a metal roof involves determining the roof's weight and installing enough structural lumber to support it for the life of the roof.
Things You'll Need
- Tape measure
- Roof-framing calculator
- Two sawhorses
- Circular saw
- Truss ties
- 1-inch long galvanized nails
- 3-inch long galvanized nails
- Hoist (optional)
Measure the span of the walls of the building over which you want to build a metal roof. Calculate and note the length and width of the roof opening. If the building has walls of different heights built for use of a single-slope roof design, then also note the pitch, or angle, of the proposed roof line
Enter into a roof-framing calculator your data from Step 1 as well as the metal roofing material's weight per square foot. Roof-framing calculators are available online. Indicate the type of framing you plan to build based on the kind of building. For example, a roof for a detached garage may require full trusses while a small roof for a shed probably will be a single-slope roof with a frame made of joists. Write down the results from the roof-framing calculator.
Mark pieces of pressure-treated, 2-by-6-inch lumber to the sizes indicated by the roof-framing calculator's results. Label each measured and marked piece to indicate its position or number in the framing project. Use the calculator's results to determine how many joists or trusses to mark on lumber.
Lay the first piece of lumber that you want to cut across a pair of sawhorses, and cut the lumber to the marked size with a circular saw. Repeat the procedure to cut each piece of lumber.
Assemble trusses on the ground using truss ties and 1-inch long galvanized nails. To do so, either insert each piece of lumber into the opening of a truss tie and nail through the pre-drilled holes or lay pieces of lumber so they abut one another, lay a truss tie across their seam and nail the truss tie into place.
Set a ladder so you can climb it to reach the top of the building's walls. Measure and mark the locations where trusses or joists will be attached to the wall frames. Use the roof-framing calculator's results as a guide.
Nail truss ties into place around the rim of the roof opening by using 3-inch long galvanized nails. Either attach truss ties at the locations you marked in Step 6, or place one truss tie at the site of each vertical wall stud for a single-slope roof.
Raise the trusses or joists into position from the ladder or by using a hoist and one or more helpers. Attach the trusses or joists to the truss ties with 3-inch long galvanized nails.
Tips & Warnings
- Before you begin work, check with your area's building code office to determine regulations for roof slopes and designs specific to your location.
- After the frame is in place, you may attach metal roofing. Screw through the raised portion of metal roofing's corrugated ridges along the metal and into the lumber frame below.
- Building the frame for a metal roof to cover an entire home requires experience in carpentry and roofing. Attempt to build a roof frame for only a small structure, such as a single-slope shed, if you lack those skills.
- Follow all safety precautions specified by its manufacturer when using a circular saw, which may include wearing eye and ear protection.
- Photo Credit Photos.com/Photos.com/Getty Images
How to Build a Simple Sloped Top Shed
A sloped roof shed design, also known as a pent roof design, is a simple design that creates a structure that is...
How to Frame a Single-Slope Roof
A roof that slopes in only one direction is called a shed or pent style. It is a common roof on sheds...
How to Build a Patio Cover
A patio cover can be a nice addition to your home and can be useful as a functional piece of furniture. It...
How to Install a Metal Roof on a Shed
While a metal roof can be a noisy addition to a home, it can be the perfect solution for a shed in...
How to Build a Small A-Frame Cabin
A-frame cabin construction is ideally suited for areas that receive a heavy accumulation of snow. The steep roof design of the cabin...
Installing Metal Framing for Roofing
Framing for a house is typically constructed from 2-by-4 boards that are used to make the exterior and interior walls to support...
How to Build a Shed With a Sloped Roof
Storage sheds are a practical way to generate storage space on the outside of your home. A sloped roof storage shed can...
How do I Build a Small Roof Over the Grill?
Outdoor kitchens are trendy accessories in many areas. Some are elaborate, with granite or stone countertops, built-in ovens, grills and even sinks....
Types of Metal Connectors for Roof Framing
Common roof framing consists of several distinct components. The board that runs down the center of the roof is the ridge. The...
Different Types of Roofing
Choosing a roof type will depend upon your finances, aesthetics, building codes and climate. Today's homeowners have a vast array of choices...
How to Use Metal Roof Framing
Learn how to use metal roof framing in this free roofing instruction video.