adding an attic bedroom

nailitFebruary 13, 2009

I have recentaly added on to the back of my house. I added 18x54 2-bedrooms and a bath and large living room. the old section of the house was 30x54 and the roofing section is a truss style. when i added on to the back I extended the gable of the old roof ( 9'9") and framed up regular rafters for the new roof.The back of the old roof is now in the attic of the new. I now whant to add a bedroom in the attic space. But this means to get enough space i need to cut out some of the trusses to have living space.What i want to do is run 2x8's along the cieling joists of the trusses they are 2x4's now.and nail them to each other for support. then brace the area that i will cut with a strong back and some 2x6's. Then just frame up with standerd 2x4 framing for the bedroom. can this be done safely?

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davidandkasie

it is trusses, so you MUST get an engineer to look it over first. what seems minor to a casual observer could have catastropic effects.

are the floor joists even rated for the new load of a room above?

    Bookmark   February 13, 2009 at 12:50PM
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mightyanvil

If the floor framing of the new attic is strong enough for a bedroom load, your best bet is to duplicate the framing of the new roof and attic floor next to the existing trusses and then cut out the parts of the trusses that are in the way. It would be wise to consult with a design professional so the existing conditions could be investigated in order to avoid any structural blunders.

Forget the strongback and 2x6's unless you know how to design a truss including the connections. I suspect that the house would have to be very narrow for 2x8 floor joists to do the job. How did you arrive at that size?

    Bookmark   February 13, 2009 at 1:58PM
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nailit

the new addition ceiling joists are 2x8's and the trusses in the old section are made out of 2x4's. the longest span without a wall interaction is 10'. the ceiling joists will sit on atleast 2 walls for support. and the 2x8's will be nailed to the ceiling joists section of the 2x4 trusses.thus making the 2x8's the new ceiling joist where the trusses were. they are all 24" centers. the attic addition will be almost equal in area from new section to old section (attic space).

    Bookmark   February 13, 2009 at 7:11PM
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msjay2u

I would get an engineer to look at it too. Better safe than sorry!!

    Bookmark   February 15, 2009 at 2:03AM
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mightyanvil

The big question is whether or not you plan to remove any intermediate truss members.

I don't know how they are positioned but, in general, they are designed to be as efficient as possible and therefore the removal of intermediate members could lead to collapse of the roof if enough trusses are modified.

This is definitely not a DIY project.

    Bookmark   February 15, 2009 at 6:28PM
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jejvtr

Is there a window for egress?

    Bookmark   February 16, 2009 at 8:44AM
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jejvtr

Veteran firefighters had to jump to their death because a fire they were fighting in a Bronx building had no egress - Reason? greedy landlord blocked the windows with partitions in order to increase his revenue by illegally adding more apartments
Perished decorated veteran fireman - with 7 children between the 2 - Imagine the horrific way these 2 perished- deciding to jump 50' to concrete or be engulfed in flames

http://cms.firehouse.com/web/online/In-The-Line-Of-Duty/Firefighters-Killed-in-Bronx-Blaze-Were-Forced-to-Give-Up-Their-Hose/39$38599

Egress is literally defined as "a path out" or "to emerge," and these terms directly apply to the design principles behind egress windows. In case of an emergency, windows installed in any sleeping room must pass strict codes so that occupants can exit and rescue specialists can enter the bedroom. In other words, when a fire occurs, your bedroom windows have to be of a certain size so you can escape and firemen can come in. These requirements also include basement egress windows if you have a finished bedroom below.

The Regulations
Remember, when you're adding a bedroom to your home or basement, you have to keep certain requirements in mind:

Minimum width of opening: 20 in.

Minimum height of opening: 24 in.

Minimum net clear opening: 5.7 sq. ft. (5.0 sq. ft. for ground floor)

Maximum sill height above floor: 44 in.

    Bookmark   February 17, 2009 at 7:24AM
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mightyanvil

Did I miss the OP saying he wasn't going to have windows?

    Bookmark   February 17, 2009 at 3:47PM
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jejvtr

well since he didn't come back following the window ? and did not state in any postings about a window - I'll take a guess - No

    Bookmark   February 18, 2009 at 4:33PM
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