Drywall over plaster

Old 10-23-13, 06:20 AM
Thread Starter
Join Date: Apr 2012
Posts: 13
Upvotes: 0
Received 0 Upvotes on 0 Posts
Drywall over plaster

Hi there,
I am currently drywalling over my plaster walls and had some mudding questions. Some of the pieces that I have placed on the ceiling have a gap of about 1/2 inch to 3/4 inch. I know these will be taped and mudded but was wondering if I should fill in the gaps with mud first before taping??
Any help is greatly appreciated.
Old 10-23-13, 06:41 AM
Join Date: Nov 2008
Location: Canada
Posts: 578
Upvotes: 0
Received 0 Upvotes on 0 Posts
That's a pretty big gap between joints, even if they're going to be taped. Filling a gap that large with mud is likely going to droop and sag unless you do it a bit at a time with a few coats.
Old 10-23-13, 07:28 AM
Banned. Rule And/Or Policy Violation
Join Date: Apr 2013
Location: USA
Posts: 3,860
Upvotes: 0
Received 1 Upvote on 1 Post
Something's very wrong if the gaps are that big.
Not sure how you could have even hit the joist if it's that far off.
What type drywall did you use?
How long a screw?
Use Drywall glue?
Old 10-23-13, 07:33 AM
Group Moderator
Join Date: Oct 2004
Location: WI/MN
Posts: 18,898
Received 1,197 Upvotes on 1,152 Posts
I'm with Joe - I want to know why you have gaps that big in the first place.
Old 10-23-13, 08:46 AM
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 45,230
Received 755 Upvotes on 660 Posts
Prefilling gaps is usually a good idea but it might be difficult to do on ceiling. Posting a pic or two would allow us to see what you see and help us to give better advice - http://www.doityourself.com/forum/el...-pictures.html
Old 10-24-13, 05:18 PM
Join Date: Jul 2003
Location: California
Posts: 1,875
Received 41 Upvotes on 34 Posts
Use quick setting joint compound. I like 5 minute mud for work like this. Are you screwing into wood lath? Maybe, just maybe you can do that and get away with it if you put only one screw into a lath and that lath does not end near the screw, otherwise the lath will probably split and not hold the screw and drywall. I hope your gaps are on the sides of the studs and joists perpendicular to the framing or else you have one end of the sheet not supported well, if at all.. Maybe on a wall you can get away with this, on a ceiling it is doubtful, The hold of the screw into wood lath is tenuous at best.
Adhesive is only as good as the bond to the paint and the bond of the paint to the plaster.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: