How to Repair a Large Crack in Plaster || Video :: Using Big Wally’s Plaster Magic + Standard Drywall Techniques
A few years ago we removed a portion of the load bearing wall that separates our kitchen from our living room. While I started this work, the “Other Man” finished it. The Other Man is my playful name for Mrs. Moxie’s (aka my wife Jen’s) partner and friend, general contractor Pete. They did several flips together.
Note: Good pictures of our kitchen in the linked post above. For more on the process of removing that load bearing wall, you can read about some of that work here >> Finishing the Kitchen Passthrough. For even more on removing load bearing walls, see this article from The Family Handyman >> How to Install a Load Bearing Beam.
* How Did This Plaster Crack Happen?
When the Other Man removed this wall, the plaster immediately above (in our bonus room / playroom) cracked. He did have temporary support in place when he removed the wall, but possibly not enough. That, or it was simply our house over time trying to reject … said surgery.
I wrote about that room here >> Cats, a Mouse and This Old House. While we have used this room as a playroom, we are finally now making plans, and as my daughters are getting older, to reno that room. (The wall’s peach color – honestly, a fail.)
Before we started on this room, I had to repair that large crack in the plaster. A little consuming and actually, it was just one of several plaster repairs I was making around the old house. For this post, I focus only on that large crack and in fact, I made a video about it. It was a blast getting some “assistance” from my youngest daughter Eva, 8.
How to Repair a Large Crack in Plaster (Using Drywall Compound)
Repairing plaster can be broken down into two large parts:
- First, you must secure your loose plaster,
- Then, you must finish your repair, preparing it for paint.
Below the video you will find a complete list of tools used, as well as the procedure I followed.
* Tools & Supplies for Repairing Plaster
Big Wally’s Plaster Magic Repair Kit. Drill Driver. 3/16″ Masonry Bit. Shop Vac. Caulk Gun. Flexible Putty Knife. Easy Sand Joint Compound. Drywall Mud Pan. 4″ Repair Knife. CrackSpot Repair Mesh. Lightweight Joint Compound. 6″ & 12″ Taping and Finishing Drywall Knives.
* Steps for Repairing Plaster
The complete procedure as it appears in the video below (plus some time markers):
- Securing the Plaster (aka using Big Wally’s Plaster Magic) – 1:15
- Remove Loose Plaster with a Putty Knife
- Drill Holes 1 to 2 inches away from the crack
- You’re trying to drill into the Lath
- Vacuum Dust from holes
- Squirt Conditioner into the holes
- Add Adhesive to each hole
- Install Washers in some holes
- After setting up (overnight), Remove the Washers
- Finishing Repaired Plaster – 3:59
- Mix and Apply powder-type Joint Compound
- Add CrackStop Mesh
- Apply a Bed Coat to the CrackStop
- Skim Coat the entire repair
It is the first time I worked with Big Wally’s Plaster Magic, a set of products that (from what I can tell) are sold exclusively online. (Here, on Amazon.) The Big Wally’s system came highly recommended from past contributor and historic restorationist (is that a word?), Jason Whipple.
If you view some of the pics in the video, you’ll notice that I had previously repaired a crack in this location. The nature of plaster I guess and the reason for the white areas on the wall before I even begin working my repair. Big Wally’s, in a way, was like bringing in the big gun(s). My review – it was an easy system to work with and it was an essential part of a repair that I feel should hold up for many years to come.
* Help Building Moxie Buy New Drywalling Knives
Also in the video, you’ll notice my somewhat rusty knives that some have commented on. They work all the same, but if you wanted to help us buy new knives *grin*, you could purchase yours here – by way of Amazon. (We make a small commission on each purchase.)
Tip: For a simple way to protect your knives between uses, perhaps a squirt of WD-40.
That’s it. Hopefully it helps, and hopefully you enjoy the video. While I use a podwer-based Easy Sand drywall product US Gypsum, plaster itself could be used just as effectively. (Purists would in fact suggest it.)
I love your likes and I would love if you subscribed to our channel >> Building Moxie on YouTube. For updates throughout repairs like this, find us on Facebook >> Building Moxie on Facebook.
For much more on repairing plaster, please see this guide created for The Home Depot‘s Pro Referral Network >> How to Repair Plaster Walls. Thanks. ~jb
5 thoughts on “How to Repair a Large Crack in Plaster || Video :: Using Big Wally’s Plaster Magic + Standard Drywall Techniques”
I’ve been in a bit of a panic since discovering some (major) cracks in my ceiling. Your video makes me think I can at least try for a quick fix to keep it from coming down. Off to Big Wally’s site. Thanks so much — I enjoyed the video, too!
thanks Change of Art (love the name btw). Repairing plaster (and ceilings are common culprits) can be a little time consuming, but certainly manageable with the right tools and know-how. I enjoyed making the vid myself and I’m glad you appreciated it. Good luck. ~jb
What I want to know is what does the crack look like a year from now. The large cracks we have like this come and go during the seasonal changes and so far nothing has keep the cracks invisible year to year. Keep us posted on how this performs over time please. :)
well that is a very good point. With a substrate of wood (lath in this system) you can expect some expansion & contraction, but also I gotta think that the moisture content in this now antique lath must be minimal. My hope in using the Big Wally’s set up and following with a Crackstop will greatly decrease the possibility that it will present (at least in this location). And you’re right only a few seasons will tell. Thanks for swinging in Lisa. ~jb
Thanks for having this article, it helps a lot. It’s a well-written blog and it is very informative. Keep on blogging, looking forward to see more of your posts!