Notching Joists - Building & Construction - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 10-02-2007, 10:24 PM   #1
Member
 
Join Date: Jul 2007
Location: Vancouver, BC
Posts: 61
Rewards Points: 75
Default

Notching Joists


Hi there guys and gals,

I am strengthening joists in my attic to create living space. Currently I have old stock 2X4's up there. I am spanning about 16 feet which according to my information means I have to use 2X12's. Ceiling height is not a problem so no worries there.

My question is how do I get them on the top plate? The roof rafters are not giving me enough space for the whole width of the 2X12. Do I notch them, If then how or is there some special kind of hardware I can use for this kind of problem?

Any help is greatly appreciated. Good and safe building everyone.

Advertisement

Oldhouseowner is offline   Reply With Quote
Old 10-02-2007, 10:43 PM   #2
Newbie
 
Join Date: Sep 2007
Location: Middle Tenn
Posts: 27
Rewards Points: 25
Default

Notching Joists


This may work for you. Cut the 2X12 to match the slope of the roof/rafter and let it sit on top of the wall. Granted you are cutting down what is sitting on the wall, but nail the rest of the 2X12 to the rafter all the way to the full 11.5"s that the 2X12 is.

Can the rafter carry the extra weight? Take my advice with a grain of salt, but since it only has to carry it to the wall, I think it would be okay.

If that didn't work, that would mean the rafter would have to bow to the inside, right where it is nailed to the wall.

Advertisement

97catintenn is offline   Reply With Quote
Old 10-03-2007, 01:17 PM   #3
Member
 
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519
Rewards Points: 2,000
Default

Notching Joists


Agree with 97 catintenn about the matching slope cut. Make sure you crown all the rafters so they all match as close as possible. Label them clearly and make sure you cut the slope on the correct side.
Ron
Ron6519 is offline   Reply With Quote
Old 10-03-2007, 01:38 PM   #4
Mod / ArchiBuilder
 
Cole's Avatar
 
Join Date: Mar 2005
Location: Dallas, TX
Posts: 263
Rewards Points: 250
Default

Notching Joists


Without knowing the pitch of your roof, I will hold my comments until I found out.
Cole is offline   Reply With Quote
Old 10-03-2007, 08:55 PM   #5
Newbie
 
Join Date: Sep 2007
Location: Middle Tenn
Posts: 27
Rewards Points: 25
Default

Notching Joists


Good point, Cole. But if you start with "This may work for you", then you're covered, lol.
97catintenn is offline   Reply With Quote
Old 10-03-2007, 10:46 PM   #6
Member
 
Join Date: Jul 2007
Location: Vancouver, BC
Posts: 61
Rewards Points: 75
Default

Notching Joists


Thanks Guys,

Good point about the pitch. I'm guessing the roof is about a 45 degree angle.

Here's a picture from the inside. Gotta love that blown in insulation.

PS: Giant steps are what we take ... walking on the moon!
Attached Thumbnails
Notching Joists-joist-challenge1.jpg  
Oldhouseowner is offline   Reply With Quote
Old 10-04-2007, 09:58 AM   #7
Member
 
Join Date: Jul 2007
Location: Jacksonville, FL
Posts: 886
Rewards Points: 500
Default

Notching Joists


LoL, back in the olden days when I was full of questions, I asked why is that called a "fire cut"? The GC thought a bit then said " cause if you don't cut it that way I'll fire you".
Big Bob is offline   Reply With Quote
Old 10-04-2007, 02:25 PM   #8
Member
 
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519
Rewards Points: 2,000
Default

Notching Joists


That insulation needs to be away from the sheathing. Roof framing seems to be wider then 16" on center, you might have to staple up some thin ply to bridge the roof joists.
Ron
Ron6519 is offline   Reply With Quote
Old 10-04-2007, 03:30 PM   #9
Weekend Builder
 
Crackers's Avatar
 
Join Date: Aug 2007
Location: Montreal
Posts: 74
Rewards Points: 75
Default

Notching Joists


I am guessing the wall is made of 2x4 also, so the 2x12 will sit on the 2x4's. Is there a way to put hangers in?
Crackers is offline   Reply With Quote
Old 10-04-2007, 11:08 PM   #10
Member
 
Join Date: Jul 2007
Location: Vancouver, BC
Posts: 61
Rewards Points: 75
Default

Notching Joists


Thanks for the tips everyone.

Will head up there tomorrow, do some shoveling and try to get a more accurate picture. Doesn't look like anywhere to put hangers.

Great to hear some ideas before I approach a structural engineer.

There is a small gap between the insulation and the roof sheating - can't see it in the picture, though. Thanks again for the tip. Why would you staple the plywood to the rafters?
Oldhouseowner is offline   Reply With Quote
Old 10-05-2007, 09:52 AM   #11
Member
 
Join Date: Jul 2007
Location: Jacksonville, FL
Posts: 886
Rewards Points: 500
Default

Notching Joists


Let us see how close I get from your photo: house is 1910 ish give or take 15 years. rafters are 2x4 heart pine 1 3/4" x 3 3/4" actual X 20"ish OC.

as you remove insulation to inspect to,set your new 2x12 floor joist you will discover, wood lath with scratch coat of plaster might be in the way.

your Engr should be able to give you a couple of ways to set your joist.

good luck, let us know which solve you go with.
Big Bob is offline   Reply With Quote
Old 10-05-2007, 09:36 PM   #12
Member
 
Join Date: Jul 2007
Location: Vancouver, BC
Posts: 61
Rewards Points: 75
Default

Notching Joists


Pretty bang on Big Bob. No one actually knows when our house was built probably 1912.

Thanks for the info. Will start this in January. Gotta build a staircase first.

Will keep you posted. Hey this is going to be fun... well kind of when it's done.

You rock!
Oldhouseowner is offline   Reply With Quote
Old 10-06-2007, 09:56 AM   #13
rdp
 
Join Date: Nov 2005
Location: Indiana
Posts: 64
Rewards Points: 75
Default

Notching Joists


Since you haven't mentioned otherwise, you must be satisfied with the existing support and alignment of your roof. If that is correct and your main concern is the feasibility and workability of a new "upstairs" floor - then you might consider using manufactured joists instead of standard 2 x 12s. (Sorry if this has already been discussed.)

Slant the ends of the manufactured joists to fit snuggly into the angle of the top plate and the roof line, counting on additional support of lower walls already in place to provide a strong and silent 2nd story floor. Stronger and lighter to handle than standard 2 x 12s and no concerns about crowns, etc.

Just another opinion. Good luck with your project.

A 24' manufactured joist in our area runs approx $40.00.

Advertisement

powrus is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
garage ceiling joists josh123 Carpentry 6 07-15-2009 12:07 AM
Floor joists for 2nd Floor Addition poptop Building & Construction 4 01-11-2008 08:57 PM
3/4" hardwood, same direction as joists? zel Flooring 13 05-15-2007 09:50 PM
Gun Safe vs. Floor Joists allen1466 Building & Construction 9 03-03-2006 09:16 AM
Spacing of ceiling joists Pineconeman Building & Construction 3 05-14-2005 12:16 AM




Top of Page | View New Posts