Installation of decra roofing

Written by jane humphries
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Installation of decra roofing
Decra metal roofing looks like clay or concrete tiles. (tile roof image by dbvirago from

Decra Roof Systems Ltd produces a range of lightweight tiles that replicate the appearance of traditional clay and concrete roofing tiles. The tile consists of galvanised steel with a granular coating and is under warranty for 30 years. The application requires the use of Decra-coated nails to keep the warranty valid. The roofing system installs quickly due to the large size of the tiles in comparison to traditional clay and concrete products, and unusually the tiles install in courses from the ridge line down, rather than the standard eave-edge and up roofing method.

Skill level:

Things you need

  • Roofing battens
  • Decra tiles
  • 2-inch Decra roofing nails
  • Hammer
  • Protective gloves
  • Safety goggles

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  1. 1

    Install roofing grade battens according to the manufacturer's instructions using 2-by-1-inch battens for rafter centres up to 3-feet wide, and 2-by-2-inch battens for rafter centres between 3 and 4 feet wide. Line in between the battens with 13.6kg roofing felt.

  2. 2

    Position the first tile at the roof's rake edge and on the ridge line batten. Overlap the last rib of the first tile with the first rib of the second tile. Continue to position tiles along the course in the same way.

  3. 3

    Move down one course and lift the bottom edge of the tile above and position a tile underneath it by 2 inches. Position the next tile along by overlapping the side rib of the one before it and placing the tile under the one above it by 2 inches.

  4. 4

    Repeat Step 3 to position a further course below. Move up to the first course, and using 2-inch Decra nails and a hammer, fasten four nails in total per tile, insetting 1 inch from the top edge. Position the nails at the side base of every other pan and one through the side overlap.

  5. 5

    Move down one course and fasten the next course of tiles by using four nails per tile hammered into position through the horizontal overlap at 1-inch inset from the bottom edge of the tile above.

  6. 6

    Continue to position a further course in between the fastening of each row so that you have a loose course above the next course of tiles that you want to position. Fasten the final eave-edge course along the bottom edge of each tile with four nails inset by 1 inch to complete the Decra roofing.

Tips and warnings

  • Use caution when climbing on the roof to avoid falling.
  • Wear protective gloves and safety goggles when handling metal roofing to avoid injury from sharp edges.

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