Cantilever Deck Addition
by Cliff Dawson
I have an existing 28 x 8 elevated deck. I want to extend it by 4 feet to allow enough room to screen in the deck. The joists are 2 x 8s on 15" centers.
How far out can I extend a cantilever without having to put support posts on the end?
I planned to use 8ft 2x8s bolted to the existing joists and putting 4 diagonal supports back to existing posts at 8ft intervals and securing them to the fascia which would tie to all the joist ends.
Am I building an inherently weak structure?