Some of you guys have seen my progress on my construction thread.....and now with all this work, my build now decides that the room is too "unstable" without attaching to the house frame somehow.

What are my options? the room is already built as seen here:

http://s193.photobucket.com/albums/z250/GregTina_photo/?action=view&current=1179445743.pbw


duracoustic floor substrate....then 3/4"osb...then GG....then 3/4 osb.....

then the room is built on that with careful care not to screw or nail through the duracoustic. It has separate rafters as well as you can see.

The only problem is that it DOES move somewhat and my builder is freaking out....

If I relent and attach to the frame I have essentially negated everything.

My builder also wants to spray this foam into the wall cavity to fill it for insulation. This would effectively also attach the two structures right? My builder seems to think that it would help with the stability???



P L E A S E H E L P ! ! !

I looked at your thread and the gallery. I don't see many pictures of the framing details.

That being said, it is going to wiggle until you get the gwb on there to stiffen it up.

Worst case you could use some pac intl dc04 to secure the new wall studs to existing.

If you are going to use rsic-1, I could see where you might have a problem if all the walls and the ceiling are freestanding.

I would _not_ fill the cavities with spray insulation.

Tim

http://s193.photobucket.com/albums/z250/GregTina_photo/

You should have about 12-15 pics of the room structure....

So the sheetrock *should* give the room some more stiffness?

http://s193.photobucket.com/albums/z250/GregTina_photo/?action=view&current=1179455316.pbw

Your builder doesn't have a clue what you are tying to achieve. Don't be bullied.

Yes, sheet rock will add over a ton of weight and stiffen things up a bit. It ain't going anywhere unless seismic issues are an issue. Just say No to the spray in foam.

To make him happy maybe you could attach a few (6-8) stategic points along
the top plate to the exterior with RSIC isolation clips.

or I could just attach some with screws for NOW. then take them out later...

I wonder if anyone has done a room like this can attest to what happens if you finish it out and someone gets pushed into a wall. Do the sheetrock seems crack?

I had a brain fart this morning on this subject and relating it to another thread I was following about a California sheer wall construction....

What if you put up a layer of plywood/GG/drywall instead of two layers of DW for the walls?

The plywood would give you all the lateral stability you would ever need. You might check with the GG guys about changes in performance.

I'm confused. Are you saying the second floor of the addition is not anchored to the first?

That is exactly what I am saying. You don't want the sound transmission. One screw/nail that attaches the 2 floors almost effectively eliminates all the efforts with GG/rubber flooring etc...

What will keep the second floor from bouncing off during an earthquake, tornado, hurricane, etc?

There is an outer frame which is structurally sound. This is internal room within a room.

I called the guys at GG and they said 3/4" OSB would be fine soooo....

The first layer will be OSB then GG then 5/8" SR. This will be one solid room :)


Thanks for the feedback guys

The OSB will give the room within a room shear strength.
The outer structure will give the room the earthquake, etc strength.

I'm not an engineer, but I don't see what the builder's concern is?

Well, he was more concerned when it was "just" SR. He nows feels better that the OSB will be the first layer.

IT has been tough working with these guys on these types of specifics. I don't blame them because it is out of their comfort zone.

Electrical
HVAC
Framer

all looked at me like I have been speaking german :)

It has been fun though to wathc the light bulbs go on and wow....

The electrician still is not sold....