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Cantilevering 5'From: dknorr2@earthlink.net
Category: Structural
Remote Name: 24.129.154.248
Date: 27 Feb 2004
Time: 02:08 PM
CommentsI am planning to build a 2-bedroom apartment above my existing 23’X23’ drive-through carport, which is attached to my house. The house is a single story. I want to increase the footprint of the apartment to 23’X28’, by cantilevering 5’ over the house roof. My architect friend said that there are no bearing walls in the house to support a second story. Therefore, I must cantilever 5’ over the existing house roof, which is almost flat. This is the only direction I can go, to obtain the added footprint, because of setback and other restrictions. To support the addition, I plan on erecting six 16”X16” concrete columns set on pads; one at each corner of the carport slab, and one set midway between the ones at the far corners, and one set midway between the corner columns set next to the house (in other words, three against the house, and three set 23’ away from the house). My questions are these: Can a floor joist be cantilevered 5’? What kind of floor joist? What size? 16” on center? Can I build them myself, if they are webtrusses; or do they have to be built by a truss company? My instinct would be to build webtrusses 24” deep, and glue nail 2’X 12’ of ¾ plywood to each side of the trusses at the cantilevered ends. I’m no engineer, but that seems like it would be sturdy enough. Any input would be appreciated. David
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