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Old 09-07-2008, 08:35 PM   #1
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Attic remodel


I am taking a finished attic space and turning into a master bedroom. Today I found that the floor joists are 2x6 18'6" being held up by knee walls that will be coming out. I need to sister on 2x8' to the 2x6's what is the best way?
I have heard take off facer and push 2x8 through and also use 3 pieces with joints on the ends. Which is the better????

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Old 09-07-2008, 09:50 PM   #2
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Having a hard time understanding your question.

You're removing kneewalls that are currently supporting 2x6 floor/ceiling joists that are spanning over 18'? After removal of the kneewalls what will provide bearing for the joists? Will the removal of the walls make what is now a supported splice or overlap into a splice or overlap that occurs out in the span? If so, biiiiiiig problem.

Even if your 2x6's are full length without splices, adding a 2x8 sister joist to each one will not come close to spanning over 18'...Not even close. It will deflect drastically, and the deflection will be very noticeable under foot.

Any pictures, diagrams, or more detailed descriptions you can post will help us help you better.

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Old 09-08-2008, 05:19 AM   #3
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Yes 2x6's now span the full length outside wall to outside wall. 2x8's would be the same sistered to them. still not enough?

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Old 09-08-2008, 04:35 PM   #4
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For occasional attic use (for service, etc.), it would get you by. But making it into living space changes things quite a bit. Despite the addition of the 2x8's, it will be a poor-performing floor system, and I think you'll regret it. It certainly will not pass code.
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Old 09-08-2008, 07:43 PM   #5
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Thanks for your input. Change of plan is a 14' beam made up of 4- 2x8's and plate steel. 2x8's will sister 2x6's and both will hang from beam.

ps no codes in NH

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Old 09-09-2008, 12:14 AM   #6
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Thanks for your input. Change of plan is a 14' beam made up of 4- 2x8's and plate steel. 2x8's will sister 2x6's and both will hang from beam.

ps no codes in NH

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ABT
It is my understanding that the national building codes apply to most developed countries in the world and to all 50 states. My understanding is that the expecption are areas that have created more restrictive codes than what national requires.

Someone please correct me if I am wrong, are there really areas in the us that do not have any building codes? Don't you have to follow NEC, and the national fire code everywhere in the us?

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Old 09-09-2008, 12:19 AM   #7
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Thanks for your input. Change of plan is a 14' beam made up of 4- 2x8's and plate steel. 2x8's will sister 2x6's and both will hang from beam.

ABT
2"x12"'s 16" on center are the standard in my neck of the woods. Based on my understanding of your situation, you may need even more structural support than what 2x12's can provide. You may want to use an engineered product like i beams if space is a issue.

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Old 09-09-2008, 06:18 PM   #8
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Jamie,
The vast majority of the country has adopted the International Residential Code. I'm unaware of any state that doesn't have adopted statewide codes, and there are certainly no major cities that don't have codes. Enforcement of the codes is where many places differ. Many rural areas don't enforce codes or require permits, which is unfortunate due to the danger it poses to occupants of the homes.

I'm always skeptical when someone says "no codes apply here," as it is rarely the case.
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Old 09-09-2008, 06:46 PM   #9
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Jamie,
I'm always skeptical when someone says "no codes apply here," as it is rarely the case.
My thoughts exactly. Even at our "up north" house it is zoned and they require permits. Actually I think the inspector up north is worse because he is bored and watches for construction. It doesn't really matter because everything we do exceeds code requirements.

I suspect what people mean to say (any perhaps they don't know the difference) is "No permits are Required here", (even though code still applies) I wonder how often that is really true (that no permits are required by anyone, country, township, etc - usually someone wants a bite at the apple)...

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Old 10-20-2008, 09:02 PM   #10
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normally what size 2xs are used when spanning 18 foot?
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Old 10-20-2008, 10:59 PM   #11
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2x12's #2 fir would be the bare minimum at 16"oc. And that's pushing it.
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Old 10-21-2008, 09:33 PM   #12
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i would think that the origional 2x6 with a 2x10 sister joint would be enough. I was trying to get some preliminary figures before i pay 1800.00 to an engineer. Thanks for your imput.
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Old 10-21-2008, 11:35 PM   #13
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I was trying to get some preliminary figures before i pay 1800.00 to an engineer.
Find a new engineer. That is ridiculous for consulting on a floor system. Here, you'd pay between $200 and $400.

Might consider calling your city's HBA (home builders assoc.) to see if they have any member engineers that deal with small residential issues for people.

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