Metal carport prices will vary depending on the style and size of carport you choose your location the gauges of metal you choose for framing and sheeting and whether you need your building certified for wind snow ratings.
How to build a metal roof carport.
Measure 4 feet along the building wall and mark this measurement as well.
Make sure the carport is laid out square with the existing building.
Beginning at one of the plumb line marks measure 3 feet out from the building on the string and mark this with a felt tip pen.
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Attach the rib assemblies to the base frame and anchor the frame.
Assemble and attach.
Use a power drill to attach the components for the front middle and back rib assemblies.
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One method of ensuring square is with right angle string lines.