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Hanging a bookshelf DIY [message #99475]

Sun, 12 September 2010 18:11

Dave Martin

Messages: 59
Registered: May 2010
Location: Ames Iowa Home Base

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I'd like to hang a bookshelf over my Dinette. It'll hold about 50-75lbs of dead weight.

I suspect the interior construction ribs are strong but have not seen the construction details. I suspect the rib covers shown in the photo below lie over the structural ribs; is this true?

Can I simply drill & tap (say 1/4-20) in the center of the ribs indicated & expect sufficient weight bearing capacity?

If not, how might heavy things like bookshelves be supported?

Dave

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Re: Hanging a bookshelf DIY [message #99477 is a reply to message #99475]

Sun, 12 September 2010 18:33

zhagrieb

Messages: 676
Registered: August 2009
Location: Portland Oregon

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Senior Member

Dave,

here are some pix of the ceiling structure. No dimensions, no way to know where the cross members are relative to your seam. You might try a stud finder or electrical box finder. The overhead cabinets were fastened to the longitudinal roof and side members and would probably be best for your shelves. They were held in place with self threading screws and carried pretty much whatever was crammed into the cabinets.

http://www.henry-davis.com/GMC/#Ceiling

Glenn

Glenn Giere, Portland OR, K7GAG '73 "Moby the Motorhome" 26'

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Re: Hanging a bookshelf DIY [message #99480 is a reply to message #99477]

Sun, 12 September 2010 18:46

Dave Martin

Messages: 59
Registered: May 2010
Location: Ames Iowa Home Base

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Glenn Giere wrote on Sun, 12 September 2010 18:33

Thanks Glenn,that's a big help!

Dave

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Re: [GMCnet] Hanging a bookshelf DIY [message #99485 is a reply to message #99477]

Sun, 12 September 2010 19:19

Bill Massey

Messages: 201
Registered: March 2009

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Senior Member

Here are dimensions:
www.bdub.net/GMCdrawings/

bdub

-----Original Message-----
From: On Behalf Of Glenn Giere

here are some pix of the ceiling structure. No dimensions, no way to know
where the cross members are relative to your seam. You might try a stud
finder or electrical box finder. The overhead cabinets were fastened to the
longitudinal roof and side members and would probably be best for your
shelves. They were held in place with self threading screws and carried
pretty much whatever was crammed into the cabinets.

http://www.henry-davis.com/GMC/#Ceiling

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Re: Hanging a bookshelf DIY [message #99497 is a reply to message #99475]

Sun, 12 September 2010 21:32

Hardie Johnson

Messages: 483
Registered: January 2004
Location: Raleigh NC

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Dave Martin wrote on Sun, 12 September 2010 19:11

I'd like to hang a bookshelf over my Dinette. It'll hold about 50-75lbs of dead weight.
<>
If not, how might heavy things like bookshelves be supported?
Dave

I would not expect drilled and tapped holes to have enough security in the long run. A better way would be 1/4-20 Rivet nuts.
For example:
http://www.mcmaster.com/#rivet-nuts/=8tln7x
You can install these using a socket head cap screw, right angle hex wrench, and a nut and washer. Put studs in them to locate the bookshelf, then replace with suitable bolts after mounted, replacing one at a time. Finding the ribs is the hard part.
"been there, done that, has extra holes in the ceiling as proof"

Hardie Johnson "Crashj"
1973 26 foot Glacier, White Thing
Raleigh NC

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Re: Hanging a bookshelf DIY [message #99514 is a reply to message #99475]

Sun, 12 September 2010 23:08

Chr$

Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ

Karma: 1

Senior Member

Here's what I did.

http://www.gmcmhphotos.com/photos/showphoto.php?photo=29669&title=new-headliner-and-cabinets-may-2009&cat=3625

Basically I ran two steel studs down the center and mounted my ceiling panels to them and the existing 1/4-20 riv-nuts for the cabinets. My cabinets are built on 1/2 Plywood sheets suspended from the ceiling.

It holds nicely. Still need doors. There is some squeek coming from this assembly (I think) so I may replace the center studs with wood to firm it all up down the road.

JWID.

good luck.

-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"

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Re: [GMCnet] Hanging a bookshelf DIY [message #99527 is a reply to message #99497]

Mon, 13 September 2010 06:46

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

On Sep 12, 2010, at 10:32 PM, Hardie Johnson wrote:

>
>
> Dave Martin wrote on Sun, 12 September 2010 19:11
>> I'd like to hang a bookshelf over my Dinette. It'll hold about 50-75lbs of dead weight.
>> <>
>> If not, how might heavy things like bookshelves be supported?
>> Dave
>
> I would not expect drilled and tapped holes to have enough security in the long run. A better way would be 1/4-20 Rivet nuts.
> For example:
> http://www.mcmaster.com/#rivet-nuts/=8tln7x
> You can install these using a socket head cap screw, right angle hex wrench, and a nut and washer. Put studs in them to locate the bookshelf, then replace with suitable bolts after mounted, replacing one at a time. Finding the ribs is the hard part.
> "been there, done that, has extra holes in the ceiling as proof"
>
>

Another way would be to use a clip nut. You drill a hole through the metal support and clip the nut over the hole
.
http://www.mcmaster.com/#clip-on-nuts/=8tsr0r

The 1/4" -20 thread is item 94808A156

You can, however, buy the same thing for a lot less at about any auto parts store such as Autozone.

I used these to replace some rivet nuts that spun in their holes and also when I installed new cabinets over our couch.

Emery Stora
77 Kingsley
Santa Fe, NM

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[GMCnet] The motor install has begun [message #99530 is a reply to message #99527]

Mon, 13 September 2010 07:08

Jim Bounds

Messages: 842
Registered: January 2004

Karma: 0

Senior Member

Richard W. did finally get the new roller cam built motor we have been waiting
for.� His plan is to have it installed, running and at the D Quoin rally for a
talk on the mud, blood and beer of the R&R Monday morning.� lets all wish him
good luck and few problems on the install.� Get-r-done there Richard!� Please
call me if you have any questions,

Jim Bounds
-----------------------------------------

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Re: [GMCnet] Hanging a bookshelf DIY [message #99538 is a reply to message #99527]

Mon, 13 September 2010 07:56

k2gkk

Messages: 4452
Registered: November 2009

Karma: -8

Senior Member

After having looked at the McMaster-Carr page
cited by Emery, I believe I would select the
Type 3, such as 90679A032 which I believe would
offer far greater resistance to "spinning" than
the 94808A156 Emory mentioned or even 94850A129.

I believe these would offer FAR greater holding
power, especially for supporting a cabinet that
will be called on to hold a considerable amount
of weight.

~ ~ ~ ~ ~ ~ ~ ~ ~
~ Mac Macdonald ~
~ Hamcall K2GKK ~
~ Oklahoma City ~
~~ "Money Pit" ~~
~ '76 ex - P.B. ~
~ ~ ~ ~ ~ ~ ~ ~ ~

From: emerystora@mac.com
Date: Mon, 13 Sep 2010 07:46:46 -0400
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Hanging a bookshelf DIY

Another way would be to use a clip nut. You drill a hole
through the metal support and clip the nut over the hole.

http://www.mcmaster.com/#clip-on-nuts/=8tsr0r

The 1/4" -20 thread is item 94808A156

You can, however, buy the same thing for a lot less at
about any auto parts store such as Autozone.

I used these to replace some rivet nuts that spun in their
holes and also when I installed new cabinets over our couch.

Emery Stora
77 Kingsley
Santa Fe, NM
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Re: [GMCnet] Hanging a bookshelf DIY [message #99547 is a reply to message #99538]

Mon, 13 September 2010 08:38

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

On Sep 13, 2010, at 8:56 AM, D C *Mac* Macdonald wrote:

>
> After having looked at the McMaster-Carr page
> cited by Emery, I believe I would select the
> Type 3, such as 90679A032 which I believe would
> offer far greater resistance to "spinning" than
> the 94808A156 Emory mentioned or even 94850A129.
>
> I believe these would offer FAR greater holding
> power, especially for supporting a cabinet that
> will be called on to hold a considerable amount
> of weight.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~ Mac Macdonald ~
> ~ Hamcall K2GKK ~
> ~ Oklahoma City ~
> ~~ "Money Pit" ~~
> ~ '76 ex - P.B. ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~

I just went back and looked at the McMaster Carr page again. I find that I had copied down the wrong number when I made my first post.
You don't want to use one like the 94808a156. It only holds one thread. The ones that I actually used were like the "tapped hole" ones in the illustration such as 94850a140.
These have a long threaded shaft that offer several threads to support the load. They cannot slip as they clip over the edge of the rafter or side rail in the GMC. The ones that I bought at Autozone were for metal even thicker than the 94850a140.

The problem I see with the 90679a032 is that it is a nut clipped into the metal "cage". I had used this type in a different application and I found that the thin metal "cage" holding the nut can break allowing the nut to spin freely.
It also is for 1/16" thick metal which would make it a bit hard to clip onto the flange of the rafter. When I did mine I had to reach about a foot over the ceiling board to clip it on and it would be hard to do if the clip is too thin.

Emery Stora
77 Kingsley
Santa Fe, NM

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Re: [GMCnet] Hanging a bookshelf DIY [message #99584 is a reply to message #99547]

Mon, 13 September 2010 12:03

Dave Martin

Messages: 59
Registered: May 2010
Location: Ames Iowa Home Base

Karma: 0

Member

Thanks for all the recommendations.

I intend to do this work as blind as is practical; I don't want to drop the ceiling, which makes the threaded rivets or self tapping screws look attractive.

Precisely locating the longitudinal supports will be the challenge, but I hope I can assume they are symmetrical off the ceiling center-line.

Dave

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