Steps to Fix Cracks in Plasterboard Ceiling
Cracks in your ceiling are a little intimidating at first. Is it just for cosmetics? Or is something more nefarious happening upstairs? Don't panic — most cracks, especially in plasterboard ceilings, are totally normal and quite easy to fix with some elbow grease and the right tools. In this guide, we'll walk you through how to fix cracks in plasterboard ceiling step by step so your ceiling is good as new again.
How to Remove Wall Plugs from Any Wall Type
Why Do Plasterboard Ceilings Crack?
Typical causes include settlement, moisture, and movement.
There are several causes of ceiling cracks. Plasterboard ceiling cracks in UK homes are frequently caused by the building's natural settling, seasonal variations in humidity, or even minute movement in the wood.
Hairline Cracks and Structural Damage
Small hairline ceiling cracks are generally nothing to worry about — especially if they tend to follow joint lines. They are usually caused by slight material expansion and contraction. Big or uneven cracks, however, particularly if they bridge ceilings and walls or are accompanied by sagging, are probably symptomatic of dangerous ceiling cracks and should be professionally checked.
Tools and Materials You’ll Need
Joint Tape, Filler, Sandpaper, Putty Knife, Paint
To complete a plaster ceiling repair, you’ll need the following:
Ceiling crack filler or joint compound
Ceiling joint tape repair mesh or paper tape
A utility knife
Sandpaper (120 to 150 grit works well for ceilings)
Putty knife or filling knife
Primer and matching ceiling paint
Optional: Plasterboard Repair Kits
For a simpler fix, it's possible to purchase a plasterboard ceiling fix kit that will often include filler, tape, and a small toolset. Good for small jobs and beginners.
Step 1: Identify the Type and Depth of the Crack
It's a good idea before you start to figure out what kind of crack you're dealing with.
When Is a Crack Cosmetic or Structural?
If the crack is thin, straight, and isolated, it is likely cosmetic. If it's wide, irregular, or you notice any movement in the ceiling or a bulge, you may have a more serious issue to deal with. Also, if you have a lath and plaster ceiling (most older UK houses do), and the plaster is coming away from the laths, you ought to get someone professional to take a look for safety's sake.
Step 2: Clean and Enlarge the Crack
Use a Utility Knife to Create a V-Shape Groove
Take your utility knife and gently open up the crack into a shallow "V" shape. This gives the filler something to hold onto and prevents the repair cracking again in the future.
Remove Loose Debris or Dust Before Filling
Wipe the area clean with a small brush or vacuum to clear dust or flaking plaster. A clean surface will stick better.
Step 3: Applying Filler or Joint Compound
How to Apply in Layers for Deep Cracks
Using your putty knife, apply a thin layer of joint compound or ceiling crack filler. Before applying a second coat, let the first one completely dry if the crack is deeper than shallow. For a flush finish, two or three coats may be required.
Apply Joint Tape for Repeating or Long Cracks
For reoccurring or extensive cracks, apply repair ceiling joint tape across the first coat of compound. Force it out and cover with additional layers of filler on top, feathering the edges for a finished appearance.
Step 4: Smooth and Sand the Surface
Why You Should Wait Until Fully Dry
Don’t rush this part — make sure the filler is 100% dry before sanding. This might take a few hours or overnight, depending on the product used.
Which Sandpaper Grit to Use for Ceilings
Use a fine grit sandpaper (120–150) to smooth the area, blending it in with the rest of the ceiling. Be gentle to avoid scratching the surrounding paint or plaster.
When the area is clear and dust-free, prime and repaint to your ceiling shade. And voilà — your ceiling is once again its former self.
Final Thoughts
Know how to repair plasterboard ceiling UK type cracks isn't just helpful — it can also save you plenty of time and money. Whether you're attempting to patch a plaster ceiling, repairing hairline ceiling cracks, or using ceiling crack filler, these steps will have you end up with a tidy, professional finish.
Image Credit: pexels.com, pinterest.com
