How to Build a Slope Roof on a Porch

Written by cathy conrad
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How to Build a Slope Roof on a Porch
Sloped Patio Roof (morguefile)

It's great to be able to sit on the deck in the afternoons or evenings and enjoy the breeze, watch the sunset, visit with family and friends. It's even more enjoyable when a roof is attached to the deck so the sun doesn't get too hot or enjoy the rain without getting wet. A simple roof structure is an afternoon project and can be completed with a minimal amount of supplies. By using a basic structure and corrugated tin, a roof can be built over the deck before the next party.

Skill level:

Things you need

  • (4) 4x4 wood posts
  • (6) 2x4 boards
  • 4 to 6 sheets of corrugated plastic or metal
  • Post hole diggers
  • Nails
  • Hammer
  • Circular saw
  • Tape measure
  • Quikcrete concrete

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  1. 1

    Dig a hole 3 feet deep right next to each corner of the patio or deck with the post hole diggers. Include all 4 main corners to completely cover the patio.

    How to Build a Slope Roof on a Porch
    Post Hole Diggers
  2. 2

    Measure the height from the ground to just under the roof eaves on each side by the house. This patio roof will sit just under the house roof under the eaves. Add 3 feet to this height. Purchase 2 4x4 posts at this height. These will be the back posts of the roof.

    How to Build a Slope Roof on a Porch
    4x4 Posts
  3. 3

    Measure from the eaves to the front of the patio but reduce the measurement by 6 inches every 2 feet. This allows for the slope for rainwater to run off. Purchase 2 4x4 posts at the reduced height measurement. Then add 3 feet for the hole placement.

  4. 4

    Drop the longer 4x4 posts into the back holes. Drop the shorter 4x4 posts into the front holes. Fill each hole with Quikrete and water in according to package directions. Make sure posts are straight and let the quikrete dry. Measure the outside circumference of all the 4x4 new posts around the porch. Build a frame or box with the 2x4 boards of the same measurement from the 4x4's around the porch.

    How to Build a Slope Roof on a Porch
  5. 5

    Nail the frame to the 4x4's on the outside of the boards. Measure and cut a bracing board out of 2x4's that will fit in the middle of the frame at 2 foot increments.

  6. 6

    Measure and cut the corrugated metal to fit from the back of the roof to the front with a 3-inch overhang.

    How to Build a Slope Roof on a Porch
    Corrugated Metal
  7. 7

    Nail the metal in place. Continue cutting and nailing the metal in place but make sure each sheet overlaps the previous sheet to inhibit leakage.

Tips and warnings

  • Use coloured plastic panels for a unique look.
  • Use all safety precautions when using power equipment.

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