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Old 02-17-2010, 11:36 AM   #46
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Raising overhead joists in my garage. Is this a good idea?


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Originally Posted by jpearson311 View Post
Ok I see. I didn't measure it last night, but it doesn't seem to span wider than 1 stud bay (~22.5"). I'll put a header in there despite. Anything else I should worry about? Thanks!

JP
I've been pricing out my new joists and the best prices I found were pine. Would this be an ok type of wood to use? Thanks!

JP

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Old 02-17-2010, 12:11 PM   #47
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Raising overhead joists in my garage. Is this a good idea?


" Anything else I should worry about?" ----- YES, a lot of the information given.
I answered your question of post #39, right afterward. It was deleted after it was posted, I don't know why. Maybe it was the wrong answer... lol! Anyway, I picked "B" picture.

Dave's drawing is what I was explaining, with a hanger instead of the ledger. The ledger wouldn't have the same nail shear to support the max. load.

It won't work notching the top of the joist, supporting only the bottom extended leg at the stud. Here are some connections for the rafter/joist fastening: Plywood gusset: pp. 113- fig. 4-15
Different connectors: pp. 132- table 4-15
Lag screws: page 136, fig. "B".
Yield failure for bolts: pp. 161- fig. 4-33
http://books.google.com/books?id=_CP...age&q=&f=false

Dave's span is figuring repetitive joists, not individual, with a floor load of 40# live load? You may want to consult a Structural Engineer for the connections, loads, supports, etc. for the liability you would have in the future after selling when someone else loads it up.

Be safe, Gary
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Old 02-17-2010, 12:41 PM   #48
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Raising overhead joists in my garage. Is this a good idea?


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Originally Posted by GBR in WA View Post
" Anything else I should worry about?" ----- YES, a lot of the information given.
I answered your question of post #39, right afterward. It was deleted after it was posted, I don't know why. Maybe it was the wrong answer... lol! Anyway, I picked "B" picture.

Dave's drawing is what I was explaining, with a hanger instead of the ledger. The ledger wouldn't have the same nail shear to support the max. load.

It won't work notching the top of the joist, supporting only the bottom extended leg at the stud. Here are some connections for the rafter/joist fastening: Plywood gusset: pp. 113- fig. 4-15
Different connectors: pp. 132- table 4-15
Lag screws: page 136, fig. "B".
Yield failure for bolts: pp. 161- fig. 4-33
http://books.google.com/books?id=_CP...age&q=&f=false

Dave's span is figuring repetitive joists, not individual, with a floor load of 40# live load? You may want to consult a Structural Engineer for the connections, loads, supports, etc. for the liability you would have in the future after selling when someone else loads it up.

Be safe, Gary
Ok, picture B in my picture and the picture that Dave posted are the same thing. With a slope cut in the joist and connected to the side of the rafter. If it's connected to the rafter from the side, how would I use a plywood gusset as in fig. 4-15 of p. 113 of the link that you sent me? I would assume that I could only use a plywood gusset if the joist was mounted directly flush underneath the rafter or? Keep in mind my rafters are only 2x4s.

Also, for the hanger, wouldn't I have to sister another 2x4 into the wall stud so the hanger will fit on the wall?

What I get from this is that the joist is connected to the side of the rafter via lag bolts and then connected to the wall via a hanger. Correct me if I'm wrong. Thanks!

JP
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Old 02-18-2010, 08:02 PM   #49
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Raising overhead joists in my garage. Is this a good idea?


"I would assume that I could only use a plywood gusset if the joist was mounted directly flush underneath the rafter or?" ---- Correct, that is an alternative to do it. I was showing the different connections with the high nailing for shear, the sizing of bolts or lags for the strength the assembly needs to resist the forces pushing down and out.

"Also, for the hanger, wouldn't I have to sister another 2x4 into the wall stud so the hanger will fit on the wall? " ------ At the inside wall line, vertically you have 4-1/4"- 4-1/2", plus the plates- 3-1/4" if older ones, which is 7.5"+-. With a rake cut to match the roof of 2", just snubbing the top off, for a 2x10 doubler, bolted through one only. The bolts are the ties, the hangers are supporting the double joists for storage. You can change the on center layout and the joist size along with the appropriate fasteners for the shear, laterally and dead load.

Be safe, Gary
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Old 02-19-2010, 09:29 AM   #50
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Raising overhead joists in my garage. Is this a good idea?


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Originally Posted by GBR in WA View Post
"I would assume that I could only use a plywood gusset if the joist was mounted directly flush underneath the rafter or?" ---- Correct, that is an alternative to do it. I was showing the different connections with the high nailing for shear, the sizing of bolts or lags for the strength the assembly needs to resist the forces pushing down and out.

"Also, for the hanger, wouldn't I have to sister another 2x4 into the wall stud so the hanger will fit on the wall? " ------ At the inside wall line, vertically you have 4-1/4"- 4-1/2", plus the plates- 3-1/4" if older ones, which is 7.5"+-. With a rake cut to match the roof of 2", just snubbing the top off, for a 2x10 doubler, bolted through one only. The bolts are the ties, the hangers are supporting the double joists for storage. You can change the on center layout and the joist size along with the appropriate fasteners for the shear, laterally and dead load.

Be safe, Gary
Thanks GBR. I tested the way it's gonna sit last night with a piece of scrap 2x12. I looked at it sitting on the side of the rafter and directly underneath it. Let me ask you though, obviously setting it under the rafter it's gonna be lower, but both options increase the height significantly. I'm also planning on converting my garage from a 2 door to a one door. When I raise my rafters, they're going to be much higher than the header on my garage door. Does this matter? Thanks!

JP
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Old 02-19-2010, 08:48 PM   #51
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Raising overhead joists in my garage. Is this a good idea?


Just be able to use a standard 12" above garage door ceiling to fit a stock back-hang overhead track for the big door. I've built 12' ceilings with 7' high doors before, it looks a little odd, but more room for storage over the back of the car on suspended shelves.

Be safe, Gary
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Old 02-19-2010, 09:31 PM   #52
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Raising overhead joists in my garage. Is this a good idea?


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Just be able to use a standard 12" above garage door ceiling to fit a stock back-hang overhead track for the big door. I've built 12' ceilings with 7' high doors before, it looks a little odd, but more room for storage over the back of the car on suspended shelves.

Be safe, Gary
Ok thanks for the info. My Dad just brought something to my attention. The type of roof that I have appears to be "pyramidal" (http://www.cmhpf.org/kids/Guideboox/RoofTypes.html). Scroll down to see on this page. There is a peak in the middle and 4 sides. The rafters on the north and south sides run parallel to the garage door and the east and west rafters run perpendicular. Does this matter at all when it comes to raising the joists?

JP
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Old 02-20-2010, 11:02 AM   #53
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Raising overhead joists in my garage. Is this a good idea?


Yes. A picture would be nice......

Be safe, Gary
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Old 02-20-2010, 11:14 AM   #54
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Raising overhead joists in my garage. Is this a good idea?


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Yes. A picture would be nice......

Be safe, Gary
Here are some pics Gary. 2 Door Garage to a 1 Door Garage?. Down toward the bottom of the page.
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Old 02-21-2010, 03:01 PM   #55
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Raising overhead joists in my garage. Is this a good idea?


Ok team, I spent the weekend removing all of the old surface (wood) from the current joists. This revealed the poor construction of my garage door track in the middle of the garage. This is the left track as your facing the door from inside the garage.

If you wouldn't mind taking a look at the pics and letting me know how I could best get rid of the miscellaneous 2x4s and still be able to used my garage door before I put up the new joists, I'd appreciate it. I won't be able to hang the new joist for this section until I remove this stuff. Thanks!

JP
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Raising overhead joists in my garage.  Is this a good idea?-garage_door_track1.jpg   Raising overhead joists in my garage.  Is this a good idea?-garage_door_track2.jpg  
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Old 02-22-2010, 01:40 PM   #56
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Raising overhead joists in my garage. Is this a good idea?


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Originally Posted by GBR in WA View Post
Look at figure #6 here, a page or two more: http://books.google.com/books?id=iwS...joists&f=false

Cut the rake or slope on the top edge, with the bottom outside edge of the angle not below of the joist thickness. Notch across level for the top plate width (3-3/4 or ?), then cut straight down along the inside of the wall vertically to the bottom of the joist. Install a hanger on it shimming the hanger for full support off the walls top plate. Bolt or strap the rafter to the joist (tie) using 1-1/2 nails so as not to split the rafter. The 2x8s would not carry loads spanning 20. You could replace them with 2x10s, Doug/fir with fb of 1250 will carry 750# each. OR, sister a 20 D/f - 2x8 for 912#.(Square cut the ends since the other one ties to the rafter or just strap it).

Use a Simpson hanger on the doubled joist, after figuring how much meat is below the notch: http://www.strongtie.com/products/co...rs/LUS-HUS.asp

Use some straps: LST 16: http://www.strongtie.com/products/co...TS-MTS-HTS.asp

Be safe, Gary
Hi Gary. I have one last question for you on this. My rafters sit right on top of each wall stud. I'm thinking that I'm going to have to sister another 2x4 to each wall stud where there is a rafter on top. I'm thinking I have to do this because of the hangers. I'm worried about them not fitting correctly. What do you think about this (see pic)? Thanks.

Jesse
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Old 05-04-2012, 10:29 AM   #57
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Raising overhead joists in my garage. Is this a good idea?


Hi guys. I know this is an old thread and I don't know if any of you will get this, but I'm running into an issue. Can anyone tell me if I need to worry about the garage door not opening correctly depending on how high the joists are raised? In other words, if the joists are too high, will the garage door hit the garage header at the door, or anything else for that matter? Thanks.

Jesse
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Old 06-05-2012, 02:25 PM   #58
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Raising overhead joists in my garage. Is this a good idea?


For all of you out there that contributed to this thread, I completed raising my joists last weekend. There is still a long way to go, but check out the attached pic. Thanks again for all your help.

Jesse
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Old 06-05-2012, 11:27 PM   #59
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Raising overhead joists in my garage. Is this a good idea?


So what did the Inspector say about the shear hangers, was he/she good with them?

Gary
P.S. sorry I missed your last question.....
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Old 06-05-2012, 11:38 PM   #60
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Raising overhead joists in my garage. Is this a good idea?


^ I wonder if it would pass with the hangers shear strength along the grain. Downward hanger/nail pressure goes across the grain into/onto a horizontal member in most cases??

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