Hey All, I am looking for feedback about hanging the gyproc on my ceilings. the ceiling is being hung on the bottom chord of open web engineered floor trusses (open joist 2000 to be exact) 16″ deep, spaced 16″ O.C. I have used resilient channel 12″ O.C. in the bathroom and bedroom on this floor to try to keep noise transmission down a bit. I am not that concerned about noise in the kitchen/family area so I thought I would save the cost. The second floor above has two bedrooms.
Now I am wondering if I have to strap the ceiling anyway or if I can go directly on the bottom chord of the truss (which is a full 2×4 with the wide side down)
This is also a seasonal cottage that will not be heated in the winter and I want to be sure not to get the “sagging” between trusses that I have seen in a couple other camps that skipped the strapping but they were on 2′ centers. Located in southern New Brunswick, Canada if you need an idea on climate.
Replies
I would think that if you use 5/8ths rock at 16" OC then you should not see any sag.
I have hung plenty of 5/8s on 24" centers and haven't had a problem with it sagging in between the trusses.
Now that I've reread your post I see the concern. In this case I would use water resistent gypsum wallboard just for the conditions during the winter. Just in case.
Edited 9/2/2008 2:53 am by DaveMason2
If I recall correctly, greenboard is not recommended for ceiling applications. Not sure why, but I always assumed it for sag reasons.Steve
isn't it used on ceilings in bathrooms??
Green board is not recommended for ceilings by the manufacturers.
In Ca. green board has been phased out for a similar product, the name escapes me at the moment. Mike
Small wheel turn by the fire and rod, big wheel turn by the grace of god.
humitex ..
seasonal cottage we say, unheated in the winter we say.. sorry the drywall is going to have you retapping every year. Best to use as much paneling and wood as you can, or if you must small sheets, and wood trim over joints instead.
I wasn't expecting taping issues based on other cottages around here with similar situations. I will have to ask about whether they keep minimal heat on or not. something I never thought of.
We would run the RC1 on 24" centers. We do a lot of RC, make sure you face it all the same way.
General rule of thumb with RC1 is if joists are 16"oc then RC at 24", if joists are 24"oc then RC at 16".
This is for 5/8"rock. Green board does not usually go on lids, but if done must be fastened at 12"oc.
Mike
Small wheel turn by the fire and rod, big wheel turn by the grace of god.
Edited 9/3/2008 1:41 am by ruffmike
that would have been handy to know. local builing center where I bought the rc from said I should space channel on 12" centers. Maybe they were trying to sell more product. When I asked about orienting them all in the same direction, I was told it didn't really matter. seemed as simple to me to face them all the same way so that is what i did.