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Old 11-20-2008, 10:01 PM   #16
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sistering 2x6 ceiling joists


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How can one determine how much a 2x6 on 16 will support? It is a cape code style home, but the staircase runs Parallel, not perpendicular to the front of the house. Around the staircase they only span ~9 feet each, but beyond the staircase, they span the full 18 feet + the width of the staircase = 21 feet??? This is an attic, with a full staircase in a New Jersey ~1950 built house. I am not sure what type of wood this is. Just trying to pick up some general info for down the road...to see what would be involved in turning this into a BR. Or even a BR+Bath. It could be interesting or not, to know that our main floor has 2x8s on 16".
2x6 spanning 21 feet????

That is so far from holding up anything except some sheetrock. I would be real concerned about standing on it for any length of time.

Before you use that for anything you need to do some serious structural improvements.

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Old 11-21-2008, 07:47 AM   #17
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The cross members that the joists are resting on are 3.5" apart they straddle 4x4's
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Old 11-21-2008, 08:47 AM   #18
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sistering 2x6 ceiling joists


Maybe I am not seeing it correctly. There is flooring on top, so I can't really see what is going on It does not feel even remotely saggy so perhaps the distance is split and they are sitting on load bearing walls in the middle??
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Old 11-21-2008, 08:52 AM   #19
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Oh Im sorry I do not have a floor above it is a ceiling roof combination that was used as a ceiling for a screened in porch. Unlike the other guy mine will only have the weight of the sheet rock and snow load. We are on the border of NY and PA so we are lucky to get maybe 2 feet a year. The roof has approx. a 30 deg pitch to it with an existing rubber roof on top. I can take pics if that would help you visualize it. I want to make sure that this is good enough before I put my family in it.
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Old 11-21-2008, 10:10 AM   #20
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sistering 2x6 ceiling joists


Okay guys. What we have here is two new threads attached to another thread that was started over a year ago.

I think it would be best to start a new thread for each of you.

I am already confused and don't want to reply to one problem with the wrong answer.
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Old 11-21-2008, 10:12 AM   #21
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Oh Im sorry I do not have a floor above it is a ceiling roof combination that was used as a ceiling for a screened in porch. Unlike the other guy mine will only have the weight of the sheet rock and snow load. We are on the border of NY and PA so we are lucky to get maybe 2 feet a year. The roof has approx. a 30 deg pitch to it with an existing rubber roof on top. I can take pics if that would help you visualize it. I want to make sure that this is good enough before I put my family in it.
Two feet of snow can weigh a lot especially when the water content is high.

And it would appear that your roof is not going to shed this snow easily which means that it could build up.
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Old 11-21-2008, 10:24 AM   #22
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Any idea how much a sheet of sheetrock weighs? The roof has been in place for 5 years and have not moved one bit just concerned with the extra weight by the sheetrock.
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Old 11-21-2008, 10:41 AM   #23
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Any idea how much a sheet of sheetrock weighs? The roof has been in place for 5 years and have not moved one bit just concerned with the extra weight by the sheetrock.
1/2" sheet rock weighs 70# per 4x8 sheet. I am guessing that 5/8" can weight 85# per sheet. So about 3 pounds per sq ft.

With 10# per sq ft of dead load and the span of 13 ft you could put the rock on and it would be fine. Nothing else can go up there though.
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Old 11-21-2008, 11:01 AM   #24
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Thanks for all your help

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