Gable extension kits
Gable end extensions: carry your roofline straight out from the gable
A gable extension is a covered roof built off the gable end of a house, mobile home, pole barn or shop. It is framed like a lean-to, except it keeps the two slopes of your existing roof: a carport off a mobile home gable, a covered work area off the end of a barn, or a pole barn extension without touching the barn's trusses.
Gable extension pricing
Materials only, 26 ga Galvalume, posts and trim included. Configure your building, verify your phone by text, and see your exact delivered price instantly — one total, good for one week. Delivery: $200 within 120 miles of our yard, $285 beyond, final delivery cost confirmed at order based on location. Gable extension materials are usually ready within 5 days after the deposit clears.
How a gable extension is built
- Receiver C-channels on the gable. Two receiver C-channels screw to the existing gable end, one along each slope. Each is half the building width times the pitch factor for your roof pitch (about 1.054 at 4/12).
- Purlins run straight out. Purlins run from the receivers straight out from the gable, sized by how far they reach: 4 in C to 15 ft, 6 in C to 20 ft, 8 in C to 25 ft.
- Frame at the outer end. At the outer end, two rafters meet at the peak on a middle post, with posts at both outside corners. The panels follow the same two slopes as your roof.
- Longer runs. A run longer than one purlin can reach adds another frame line (two rafters, a middle post and two corner posts) partway out.
- Roof and trim. Panels cut to the slope, ridge cap along the new peak, rake trim on the open end and eave trim along both sides.
Example: a carport off a mobile home gable
Covering 20 ft off the end of a 32 ft wide mobile home with a 4/12 roof: each receiver C-channel is half of 32 ft (16 ft) times 1.054, or about 16 ft 10 in, screwed along each slope of the gable. Purlins run 20 ft straight out, so they are 6 in C. At the 20 ft line, two rafters of the same length meet at the peak on a middle post, with a post at each outside corner. Twenty feet is within one purlin reach, so there is a single frame line. Go out 30 ft and the kit adds a second frame line partway out.
Before you order
What do I need to measure?
Four things: the gable width (outside to outside at the eaves), the pitch of the existing roof (for example 3/12 or 4/12), the height at the gable (eave height at the corners where the receivers start), and how far out you want the cover to run. We confirm these before the order because they set every length in the kit.
Can it go on a mobile home or a house?
Yes. The receivers screw to the gable end of a house, mobile home, pole barn or shop. Whether your gable framing can carry the receivers is the owner's call; check with your permit office or an engineer if you are unsure.
How is this different from a lean-to?
A lean-to comes off the long side of a building with a single slope. A gable extension comes off the gable end and keeps both slopes of the existing roof, so it looks like the roof simply continues.
How far out can it go?
One purlin reach is up to 25 ft with 8 in C. Longer runs add another frame line, so the length is open-ended.
Related
Lean-to kits · 30x40 pole barn kit · 40x60 pole barn kit · C purlin prices and spacing · 26 vs 29 gauge roofing
See your exact delivered price
Configure your building, verify your phone by text, and see your exact delivered price instantly — one total, good for one week.