Building Brace Supports for a Shed Roof Off of an Existing Building

Written by katherine kally
  • Share
  • Tweet
  • Share
  • Pin
  • Email
Building Brace Supports for a Shed Roof Off of an Existing Building


Building brace supports for a shed roof off of an existing building requires treated lumber posts for the frame, treated planks for the joists, concrete, screws, a screw driver and a post hole digger. Pressure treated wood is best for outdoor applications as it is insect and rot resistant. Measure the size of your shed roof and plan to place your support posts every eight feet across the front. If you plan to extend your shed roof further than eight feet out, place your brace supports evenly from the distance of the existing building. You will need to attach a deck plank or metal bracing to the building so you can attach the shed roof.

Post Supports

Dig the holes for your shed roof support posts and pour concrete around them when they are placed. Brace the posts with 2-by-4s until the concrete is dry, and then remove the braces. You can attach the shed roof to the existing building with posts placed against the building or with a plank attached to the structure that runs the length of the roof, or both. Once the concrete is dry around your brace supports, you can begin to add the joists connecting the posts for your shed roof support.


Attach the treated wood planks across the top of all of the brace posts. You can use 2-by-6 or 2-by-8 wood planks screwed into the posts. Brace the shed roof further with cross planks running from the decking plank attached to the existing building to the brace posts. If you would prefer that your shed roof slopes downward, the brace posts at the front should be lower than the posts or decking plank against the existing building. You should apply a wood sealant or preservative to all parts of your treated wood brace support immediately upon finishing your project. Select an appropriate stain or wood sealer that works best with treated wood, as not all sealers are formulated the same. Add treated plywood to the top of the brace supports as the base of the roof, or just add tin roofing sheets to complete your shed roof. You can layer the plywood with the tin sheets, or some other roofing material like tile or shingles.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.