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Old 12-20-2007, 08:56 PM   #1
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2nd floor addition?


Im looking at adding a second story to a 600sq ft cottage. The main concern/question I have is that the floor joists are only 2x6's. Im guessing that this would not be sufficient to support another story. Can these be doubled up? Do I have any options here or is it just not feasible?
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Old 12-20-2007, 11:43 PM   #2
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2nd floor addition?


Post more details - spans etc.. The 2x6's are existing ceiling joists? You could sister(double) new joists next to them but definately don't expect to use them as floor joists in a house. With enough care and planning, you may beable to minimize damage to the existing ceiling. These types of projects are done regularly in the remodeling business, so you do have many options.

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Old 12-21-2007, 07:17 AM   #3
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2nd floor addition?


The span is 17', and Im not talking about the ceiling joists, Im talking about the floor joists on the main level...As far as damage it wouldnt matter because the place is a gut job anyway.
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Old 12-21-2007, 08:40 AM   #4
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2nd floor addition?


2x6 floor joists. wow. full basement underneith it? You need to start from the ground up and make sure your footings are strong enough to support two floors and a roof. After you are sure your foundation is up to the job you can take care of the 2x6 problem, which should be fixed anyway, the 06 irc says depending on spacing and kind of wood the vary most you can span with 12" spacing is 12'6". Im guessing your spacing is greater then 12"? After your foundation and floor joists are good you need to make sure your walls are good, size and spacing of studs? Then new floor joists, 2nd story walls, and trusses. It can be done, it just will take alot of homework to make sure it is done right and will last. Hate to stick a bunch of money and time into something that is going to have problems.
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Old 12-24-2007, 10:25 AM   #5
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2nd floor addition?


ponch37300 gives good advice here. Splitting the span with a beam and doubling the 2X6 could be an option. But a full plan for both floors above is needed to determine what needs to be done with the 2X6. Knowing if you're going the have a Jacuzzi tub or a brick fireplace and hearth for example will have a huge impact on the floor(s). Since you're gutting the place you'll have more options as you'll beable to tranfer all load points down to the foundation properly.
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