Corrugated metal pipe can be displaced or damaged during backfill. Therefore, insist on precautions to prevent damage. When siphons or watertight joints are installed, witness the required field leakage and hydrostatic tests. Refer to Section Chapter 1 - Caltrans Construction Organization. Chapter 4 - Construction Details. Chapter 5 - Contract Administration. Chapter 6 - Sampling and Testing. Chapter 7 - Environmental Stewardship. Chapter 8 - Employment Practices.
Chapter 9 - Projects Sponsored by Others. Reviewing these items sufficiently in advance helps prevent scheduling conflicts and errors in ordering materials.
Modify plans when necessary to fit field conditions. Prepare change orders for major changes from approved plans; for example, additions, deletions, or changes in type or size of pipe.
When structures are staked, adjustments may be made in location or length of cross drains or side drains, as necessary without requiring a change order. After determining final locations and lengths, give the contractor a revised pipe list, including those pipes added or altered by change order.
METS inspector will inspect and test corrugated pipe and joint material as necessary before arrival at the job site. Check the pipe for damage that may have occurred after inspection at the source.
Require the repair of minor damage to coatings or galvanizing. If satisfactory repair cannot be achieved, require the contractor to remove this unacceptable pipe from the project. If the pipe is properly identified as inspected, project personnel normally do not need certificates of compliance or mill test reports.
Before excavating pipe, require that embankments be constructed as specified. This is especially true since the dips and swells of the corrugated metal come in different widths and shapes. In most cases, the corrugated metal roofing will create a rustic design that is perfect for a garden or patio area. By following the 10 simple instructions below, you will be able to install a corrugated metal roof on your garage or shed. Without getting up on the roof itself, you can get the measurements simply by measuring the length and width of the roof and then multiply these together.
If the roof has a peak, then you will need to get the measurements of both sides of the roof. You will need slightly more than the measured amount of material due to the need for overlap on the roof. The suggested overlap for a roof is 4 inches. Depending on the area of the roof, you can use different sized panels. You can either buy large metal panels of up to 32 feet in length and then cut them to the right size, or you can purchase pre-cut metal panels at a home improvement store that may be only 10 or 12 feet in length.
If you need to cut the sheets, you can use an angle grinder, a saw or tin snips. The purpose of the roofing felt is to create a layer of insulation. If you are installing a metal roof on a structure like a patio cover, you may not need this insulation layer. Instead, you can just secure the metal roof directly to the wooden beams.
Cut the roofing felt to fit with a utility knife. The roofing felt will lay horizontally along the plywood deck of the roof. Attach the roofing felt with roofing staples. Make sure you overlap each layer by at least 4 inches. When laying the metal, you will need to start from the bottom corner of the roof and work across. After you have finished each row of panels, you will then need to start a new row that overlaps the old row by at least 4 inches.
You can think of this process as moving across the bottom of the roof and then progressively getting higher and higher until you reach the peak. When you start with the first metal panel, position it so that it overhangs the edge by at least 4 inches. Then, add screws approximately every 8 inches along the outside edge and bottom of the panel.
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