Installing flat metal roofing

Flat metal roofing is one of the best choices for roof construction. It is resistant to fire and it’s also waterproof. It’s a very durable and safe material.

It can be a little expensive to install it but it is worth the effort. It can last for a hundred years, without needing any major repairs.

But just because metal roofing is very popular, this doesn’t mean that it’s the best material that you can choose. Explore different material and see which one best suits your needs. You can also find shingles with interlocking systems that are made from aluminum and are very user friendly. Flat metal roofs are also very energy efficient. Here are the tools and materials that you will need:

  • Extension and step ladder
  • Measuring tape
  • Nail bag
  • Chalk line (orange)
  • Drill (regular drill bits, 5/16″ for screw heads, 1/4″ screw head bits)
  • Metal roofing screws (5/16″ lap metal screws, 1/4″ wood screws)
  • Hammer (heavy duty)
  • 1/2 lbs of 1 1/4″ roofing nails
  • 10 lbs of 3″ screws (long head)
  • Cutting metal snips
  • 30 lbs tarpaper or roofing felt


First of all you will need to make some measurements of your roof. Add a couple of inches to allow an overhang of the roof. Measure the length and height of your roof for the metal edging. Also measure the length of the trim pieces. If you measure the shingles, add 3 to 6 inches to allow air flow.

Creating a base

You will need to remove the old shingles and the cover the roof with tarpaper or roofing felt. This will be the base of your roof. If you have only one layer of shingles on your roof, then use 1×4 slat boards. This will need to go over the existing roof using 3 inch nails or screws. They will need to be positioned 2 feet apart. You will install the metal roofing on top of the boards.

Metal edging

To install the metal edging to the roof, you will need to use 1 1/4 inch metal roofing nails. The edging will go around the perimeter of the roof. You can use a chalk line as a guide.

Metal sheets

The first roof sheet will have wooden screws in the middle and on the inner edge every couple of feet. The next layer of sheets will be overlapping each other.

Metal trim

Now all you have to do is install the metal trim along the edges of the roof, at every 2 feet. Use 1 1/4 inch metal wood screes to fix them.

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