How to Connect a Porch Roof Onto Your Existing Roof

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A roofed porch lets you enjoy the shade on a sunny day.
A roofed porch lets you enjoy the shade on a sunny day. (Image: Karl Weatherly/Photodisc/Getty Images)

Whether you add a front or back porch to your home, building a porch gives you and your family an area in which to enjoy the outdoors. Adding a roof to your porch is particularly beneficial because it provides you with an outdoor recreational area that protects you from the elements. According to the "Inman News," home additions should not look like additions. Rather, they should blend with your home's original architecture. You can achieve this by attaching your porch roof so that that it blends well with your home's existing roof.

Things You'll Need

  • Sill plate
  • Screws
  • Power drill
  • Joist hangers
  • Roofing nails
  • Hammer
  • Plywood boards
  • Measuring tape
  • Fascia board
  • Drip edge
  • Surface roofing material

Fasten a sill plate to the house in between the porch's side support beams. The sill plate lets you secure the porch's wall supports to its roof.

Position the rafters over the sill plate in accordance with the pitch of your existing roof. Secure the rafters into the sill plate with screws. The rafters must overhang the roof by at least a foot on both sides, but additional overhang may be necessary depending on the roof's pitch. The overhang protects the porch walls from weather while simultaneously balancing the line of the roof.

Slide joist hangers over the edges of the porch roof where the rafters meet the sill plate. Nail the joist hangers in place. Joist hangers give your new porch roof additional support.

Nail plywood boards over the rafters. Cover the entire porch roof frame with plywood.

Measure the height of the rafter ends and the roof length. Cut the fascia board to size. Nail the fascia board to the rafters around the entire porch roof structure.

Lay drip edge over the edge of the roof and the fascia board. Nail it into place. Overlap each piece of drip edge by 3 inches. Install the drip edge on the sides and front of the new porch roof.

Install the surface roofing material. For a seamless appearance, use the same roofing material for your porch roof as you used for your home roof. For example, if your home has a clay tile roof, you should also install clay tile on your porch's roof.

Tips & Warnings

  • Check the pitch of your home's roof to determine the pitch of your porch roof before you begin this project. Knowing the pitch of your roof before you install the rafters can save you from making a costly mistake.
  • Your porch may require more than one piece of fascia board per side. Should this occur, cut the ends of the connecting pieces of fascia board at 45-degree angles so that they fit together seamlessly on your roof.
  • The amount of materials needed for this project vary depending on the size of your porch.

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