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Old 01-22-2008, 06:59 AM   #1
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Framing a round hole in a floor


I am putting in a spiral stair case and am trying to figure out how to frame a round hole in my floor to accommodate the stairs.Joists are 2"x 12" on 12" centers and span 12`6". Sub floor is typical 1.5" x 3.5" T&G. The circle needs to be 7`. Any help will be appreciated.Thank you in advance.

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Old 01-25-2008, 07:36 AM   #2
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Framing a round hole in a floor


If you are looking for a finished hole that is round I would look to layers of bendable plywood. The framing shouldn't need to be round as long as there is enough blocking to attach the laminated plywood too.

Best wishes,

Steve

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Old 01-27-2008, 06:38 AM   #3
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Framing a round hole in a floor


Thank you Steve.
Square frame rounded with laminate is what I was thinking.Just needed a push to get started.
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Old 01-27-2008, 10:41 AM   #4
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Framing a round hole in a floor


It is unlikley you will be able to do anything but a square hole for this application without special engineering.

Because of the span of the hole, a square frame must be used, and perimeter opening designed using structural girders.

These girders will need to be supported from below in all likelihood, and it is unlikley that any blocking could be installed to form a 'round' opening that will be of sufficient strength to carry the loads of the floor.

About your only choice here is a square opening, unless you want to pay to have a round opening engineered by a design professional with special (and expensive)construction methods.
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Old 01-27-2008, 01:16 PM   #5
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Framing a round hole in a floor


I agree with the majority of responses go ahead and frame a square opening using traditional framing and joist supports. The span of a 7' opening should be the same even though making a circle you will be filling in the corners. Then I would put in 45 deg angled floor supports across the square corners of the hole to make a octagon then use the curved layers of plywood and blocking to eventually have your circular opening. There would be very little overhang of the flooring for the laminate layers of plywood to support and if done right you should have plenty of support for the floor and future hand rail if attached primarily where your squared underside braces support blocking are located.
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