Galvanized roofing has become one of the most popular means of roofing homes across the United States and around the world. It has doubled the lifespan of conventional asphalt roofing, and it can be installed in half the time. Galvanized roofing can be installed by the average homeowner with only moderate difficulty, and depending on the size of the project, it can be done in as little as one day.
Galvanized roofing sheets come in 42-inch-wide pieces that overlap one another by one to two inches. Measure your roof's length, including overhangs, and its width (measure the left side of the gable's width, including overhang and multiply that by two). Convert the length of the roof to inches by multiplying the length by 12 inches. For example, if your roof length is 20 feet, will have 240 inches. Now subtract 80 inches from the 240 inches (the two end pieces minus 2 inches of overlap) and you have 160 inches. Now, divide that by 38 inches (one sheet's width minus the four inches of overlap, two on each side), and you need 4.2 sheets, plus the two end sheets, equaling 6.2 sheets, to lay across the length of the roof. You probably can't buy a fraction of a sheet, so you'll need to buy seven sheets and cut one or have it cut for you.
Work facing the gable of the roof and from right to left. Measure from the top edge of the roof 42 inches. Do the same at the bottom and then snap a chalk line across both marks. Repeat on the other side of the roof. This will be the reference line to which you will lay your first sheet.
Lay the first sheet of roofing on the chalk mark, beginning at the bottom of the roof and working up -- the sheets will either be 10 or 12 feet long, so you will need to overlap the proceeding sheets as you work your way up the roof in a single row. Apply two-inch galvanized screws into the valley of the metal pattern. You will work from the bottom to the top of the roof until one row is complete and then move to the left for the next row. Lay the next sheets overlapping the previous row to the right. The raised sections interlock. Finish attaching all the panels with screws. Attach the ridge cap, usually available in 10-foot sections, onto the ridge of the roof. This will seal of the roof at the ridge point where the two sides meet at the top.
- Roofing Construction & Estimating, Daniel Benn Atcheson, 1995
- Photo Credit Hemera Technologies/AbleStock.com/Getty Images
What Is Corrugated Roofing?
Corrugated roofing is made of overlapping sheets of metal, iron, steel, aluminum or fiber glass, which are joined together at the sides....
How to Install Galvanized Roof Panels
Galvanized roofing is steel that has been specially coated with zinc to protect it from rust and corrosion. It is a long-lasting...
How to Paint a Galvanized Metal Roof
Many metal roofs are made out of galvanized metal, which is a type of metal that has been covered with hot zinc...
How to Replace Roof Ridge Caps
Roof ridge caps are located on the very peak of your house. They are used to cover the point where two sides...
How to Repair a Galvanized Metal Roof
Although galvanized metal roofing has an average life expectancy of 50 years, weather and objects can cause the metal roof to leak....
Corrugated Roof Sheet Sizes
Corrugated roof sheets, or roofing panels, are available in dimensions that fit standard roof joists, trusses or rafter layouts. Panels vary in...
Cheap Metal Roofing Types
Metal roofs offer a variety of benefits, including affordability. Metal roofs are resistant to wind and hail as well as fire. Metal...