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Old 06-02-2011, 08:49 PM   #16
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Originally Posted by sixeightten View Post
The span of the joists is what is important. You may be able to double up every third joist, but sometimes electric, plumbing, hvac makes this tough.
You should also check the existing floor with a string and see how much deflection is there already. This will probably be a real eye opener for you.
I definitely hear you on that. The house was built in the 40's I believe, if not earlier than that. There are many places where things aren't square, plumb, or level. Now to find some string...


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Old 06-03-2011, 07:44 AM   #17
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Originally Posted by GottaDIY View Post
I'm not sure of what else I could do... any suggestions?
You should call in a professional to develop a plan that you can submit for a permit, keeping your family and any subsequent owners safe and protecting yourself from future liability.
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Old 06-03-2011, 12:35 PM   #18
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I’m not an Engineer. I believe most of the roof load between knee walls will be transferred to the floor joists below. These should be sized for that load plus any floor load.

The floor is under-sized requiring doubling joists or larger ones. The rafters are under-sized for insulating value if not span. The collar ties should be in the top 1/3 of the roofs total height. You also need egress windows in any bedroom/or room up there. Egress stairs are also required. A permit is required as mentioned. Here is more info for your planning for the permitting; l=en&gl=us&pid=bl&srcid=ADGEESh311Kosslp7jsjp9WhUX xZsgSiyNaWb-eW0YminVwmPUavLlW75BKLoV9em4LFCAydmTGQlkUFOPm8AqHk RP5wLQGQQGkwyzAGtlN4D2DqCiCLwprOpEbvvjeGk6CEhyHiVd tK&sig=AHIEtbRa4Ah_IICPQ3BR1txlzU01V4JQIg

Joists in attic;

Rafters/c.j.,/collar ties:




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