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Reply to "Cost Ballpark in 2013 for Two-Story Addition in Bethesda/Chevy Chase"
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[quote=Anonymous][quote=Anonymous] I'm the pp who wrote this and I'm also a residential architect who designs high end custom homes. I have never designed a home with a 12" joist spacing - it's just an inefficient use of resources and hard to fit electrical, mechanical and plumbing in between. It is much more cost effective to increase the depth of the joist and maintain a 16" spacing and when designed properly can still be a stiff and rigid floor. TJI is one manufacturer's designation for a wood I joist. [/quote] 12" spacing is also a way to gain extra ceiling space...a 9 inch TJI might be spaced at 16, a 7 inch at 12, thus gaining 2 inches in ceiling height. I've typically seen structural engineers prepare framing plans, not architects.[/quote]
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