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What Are the Best Tips for Metal Roofing Installation?

By Marty Paule
Updated: May 17, 2024
Views: 7,521
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The first step in doing a metal roofing installation is to choose metal roof panels, hardware, and flashing appropriate for the existing roof's pitch, decking, and framing. Making a detailed drawing will help to determine how many roofing panels and what hardware are needed. If the roof is to be installed over existing roofing materials, asphalt paper or furring strips may need to be installed between the old and new roof. Assembling the right tools in advance for a metal roofing installation will help the job go more quickly and smoothly. Carefully reading and following any manufacturer's installation instructions is also important.

Various metal roofing panel designs have differing roof-pitch requirements to ensure good drainage. Determine the pitch of the existing roof decking, then select from designs recommended for that pitch. In cases where the roof's pitch is relatively low, additional hardware and sealant may be required to ensure a watertight roof. Metal roofs are designed for use with either external or internal fasteners. Generally speaking, a metal roofing installation using external fasteners is easier to do. The type of roofing panels chosen will largely determine what types of fasteners, flashing, and other trims are to be used.

Before shopping for materials, prepare a detailed drawing of the metal roofing installation. Discuss the various assembly and hardware options with the dealer and confirm that the materials are compatible with the sub-roof. Inquire if the dealer has any videos or other advice for do-it-yourself (DIY) installations. Once purchased, all materials should be stored in a dry location unless they will be used immediately.

Tools needed for metal roofing installation include gloves with a good grip, eye protection, and an assortment of cutting and fastening tools. For smaller projects, cordless drill fastener attachments may be adequate, while, on bigger jobs, a dedicated impact driver is preferred. Similarly, a cordless drill nibbler attachment could be adequate for cutting across panel ribs, but large projects will require a power saw fitted with a metal-cutting carbide blade. Many manufacturers warn that using a portable grinder with an abrasive wheel for cutting can cause oxidization. Small hand-held metal snips designed to make right- or left-hand cuts are helpful for cutting around obstructions.

Before beginning the installation, read the manufacturer's directions completely and confirm that all the materials and tools needed are on hand. Generally, panels are installed from the gable or peak downward, in the direction opposite to prevailing winds that carry rain. Depending on the surface on which the roof will be installed, pre-drilling the sub-roof to accept fasteners will speed up installation. To prevent unsightly oxidation in the future, thoroughly clean off all metal particles once the roof and trim are in place.

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Discussion Comments
By Feryll — On Sep 02, 2014

@Animandel - I haven't installed a roof, but I have done several home repair projects on the old house we recently bought. For me, the repair jobs have been a challenge, but once I get into them I realize they are not as complicated as I thought.

Do as the article suggests and read all the information you can on the installation process before you begin. I like to go online and watch videos of people completing the projects. This lets me know what I am getting into. You may not get the roofing perfect, but I bet you can get it installed, and there is only one way to find out.

By Drentel — On Sep 02, 2014

@Animandel - If you think the price of metal roofing is expensive then imagine how expensive it will be for you when you screw up the installation and have to start over with an entire new roof. I am amazed at how many people think that all home repair can be do-it-yourself.

This simply is not true. Roofers are as much professionals as doctors, and not many people are doing their own surgeries, so they shouldn't be doing their own roofing installation either, unless they are willing to sacrifice the health of their homes.

Damaged residential roofing is one of the leading causes of serious home damage. Water leaking through a roof can lead to a long list of costly problems, including rotting wood, electrical hazards and insect infestations.

By Animandel — On Sep 01, 2014

We are considering buying a metal roof when we replace the shingles we have now. I have heard that the metal is more durable and will probably last us for the rest of our lives and beyond. I know the metal roofs save money in the long run, but the initial cost is more than twice what we would pay for a new shingle roof.

In order to save money, we are considering doing the installation ourselves. This might make the difference in pricing of the metal roofing and shingle roofing easier to bear. However, we are not roofing installers, and we might be biting off more than we can chew.

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