How to build a metal porch roof

Where do you put the screws on a metal roof?

Absolute Steel advises screws be installed down inside the flat of the panel and not in the top of the rib. See the illustration below. This is important as placing a screw in the top of the rib will prohibit a good seal.

Can you put metal roofing over plywood?

The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. Install waterproof felt over the plywood to add protection against moisture. Energy efficient and available in a variety of colors that will add value to your home, metal roofing is a wise choice for homeowners.

What is a porch roof called?

The most common porch roof is a gable roof. … Gable roofs are familiar forms and blend in well with many house designs. The peak of a porch gable roof can sometimes create problems if it interferes with house windows. A hip roof is a more complicated roof style where all the roof sides slope downwards to the walls.

How far apart should the screws be on a metal roof?

⅞” Corrugated Screw Location For Wall Panels Or Metal Siding

Lap screws are spaced 12” to 18” on center. The panel screws are spaced out so that every third corrugation has a screw including both sides of the panel sidelap.

Do you pre drill metal roofing?

More on how to install metal roofing:

On exposed fastener panels: While you are not required to, consider pre-drilling holes for your screws. Pre-drilling panels will make it easier to get the screw lines straighter. … Otherwise, they will cause unsightly rust spots where they rest on the metal roofing.

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How do you keep screws straight on a metal roof?

Chalk Lines

A chalk line will keep your screw lines straight and spaced at the correct intervals. In addition, if you are installing the metal roofing over metal purlins it will insure that you fasten the screw in the center of the purlin. If you were to miss the purlin you would end up with holes in the metal panel.

Do you need plywood under a metal roof?

As long as the interior of your roof is protected from moisture accumulation, underlayment is not required, though homeowners planning to insulate their house heavily may choose to install plywood to protect their investment. …

Does a metal roof need furring strips?

When installing a metal roof over an existing roof, insulate the spaces between the wood strips with rigid insulation to prevent condensation before installing the roofing. You also need to add furring strips. … Twenty-four inches is a common spacing of furring strips for a metal roof.

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