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jdgmsg 11-13-2011 11:58 AM

attic access
 
I want to put attic access into my garage. My 2x8s are 16 inches apart and I would like to cut one to widen access. Is this safe and what kind of bracing does it need?

woodworkbykirk 11-13-2011 12:04 PM

you'll need to double up the two ceiling joists which are going to be the sides of the opening plus header off the opening

Gary in WA 11-13-2011 11:32 PM

If in the U.S., you may be under the IRC: R502.10 Framing of openings. Openings in floor framing shall be framed with a header and trimmer joists. When the header joist span does not exceed 4 feet (1219 mm), the header joist may be a single member the same size as the floor joist. Single trimmer joists may be used to carry a single header joist that is located within 3 feet (914 mm) of the trimmer joist bearing. When the header joist span exceeds 4 feet (1219 mm), the trimmer joists and the header joist shall be doubled and of sufficient cross section to support the floor joists framing into the header. Approved hangers shall be used for the header joist to trimmer joist connections when the header joist span exceeds 6 feet (1829 mm). Tail joists over 12 feet (3658 mm) long shall be supported at the header by framing anchors or on ledger strips not less than 2 inches by 2 inches (51 mm by 51 mm). From: http://publicecodes.citation.com/ico...002_par031.htm

Gary

househugger 11-16-2011 10:46 AM

BC building codes state that all openings in garages are to be weather stripped and self closing, and that includes attic accesses.

That's for your own safety, to block the passage of carbon monoxide, which is not to be treated lightly.

mrgins 11-17-2011 10:58 AM

Quote:

Originally Posted by GBR in WA (Post 770725)
If in the U.S., you may be under the IRC: R502.10 Framing of openings. Openings in floor framing shall be framed with a header and trimmer joists. When the header joist span does not exceed 4 feet (1219 mm), the header joist may be a single member the same size as the floor joist. Single trimmer joists may be used to carry a single header joist that is located within 3 feet (914 mm) of the trimmer joist bearing. When the header joist span exceeds 4 feet (1219 mm), the trimmer joists and the header joist shall be doubled and of sufficient cross section to support the floor joists framing into the header. Approved hangers shall be used for the header joist to trimmer joist connections when the header joist span exceeds 6 feet (1829 mm). Tail joists over 12 feet (3658 mm) long shall be supported at the header by framing anchors or on ledger strips not less than 2 inches by 2 inches (51 mm by 51 mm). From: http://publicecodes.citation.com/ico...002_par031.htm

Gary

But if I got a dollar for everyone I saw done that way, I'd still be a very poor man!

Gary in WA 11-17-2011 10:45 PM

For sure. Lol Usually (95%) of the time, they are installed in the hall ceiling, or bedroom closet ceiling. And, within 3' of the walls nearby to meet the distance rule, which was recently added to Code.... though many garage accesses would fail.

Gary

TheCamper 11-19-2011 04:56 PM

As previously mentioned, double the joist on each side of the opening (trimmer joists) and install single headers, I like to use joist hangers rather than just box nailing or toe nailing. But, a garage that is attached to a one-family dwelling has required a 45 minute fire separation in most jurisdictions for at least 25 years. If you have that rated separation, e.g. 5/8" type X gypsum board on the walls and ceiling, taped and spacked, with a self closing rated door and jamb to the house, then you may not want to compromise that fire separation, or depending on your configuration, add 5/8" type X gypsum board to a knee wall or sidewall that is common with the living space.

havalife 11-19-2011 10:43 PM

Quote:

Originally Posted by jdgmsg (Post 770230)
I want to put attic access into my garage. My 2x8s are 16 inches apart and I would like to cut one to widen access. Is this safe and what kind of bracing does it need?

No it is not safe. You have too many issues that need to be answered.
To start what is the wieght of the load for the joists that you want to cut?


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