Cracked plaster can be a common issue in older homes, but with the right tools and techniques, homeowners can restore their walls and ceilings to a pristine condition.
Many homeowners turn to professional services like national plastering companies for repairs, but fixing cracks in plaster is a task that can often be handled yourself. In this guide, we will go over step-by-step instructions to help you repair cracked plaster in your home.
Step 1: Prepare The Crack
Before you can apply any plaster filler, it is important to properly prepare the crack. Here’s how to do it:
Clean The Crack
- Brush Away Debris: Use a brush to clean the crack of any dust or loose plaster. This ensures that the plaster filler will adhere properly.
- Vacuum the Area: A vacuum with a nozzle attachment can help suck up any remaining dust and dirt.
Widen The Crack (For Large Cracks)
- Use a Utility Knife: For small cracks, you can skip this step, but for larger fissures, it’s helpful to slightly widen the crack using a utility knife.
- Create a Clean Edge: This will allow the filler to bond more effectively to the plaster and help with an even application.
Step 2: Apply The Plaster Filler
Once the crack is clean and prepared, it’s time to apply the plaster filler. Follow these steps for the best results:
Choose The Right Plaster Filler
- Small Cracks: For hairline cracks, a lightweight filler or plaster repair compound is sufficient.
- Large Cracks: For bigger cracks, you may need a heavier plaster filler designed for structural repair.
Apply The Filler
- Use a Putty Knife: Take a putty knife and scoop up some plaster filler. Begin applying the filler into the crack, starting from one end and moving towards the other.
- Press Firmly: Press the filler firmly into the crack, ensuring it fills every crevice. For deep cracks, you may need to apply multiple layers, allowing each one to dry before adding another.
Smooth The Surface
- Remove Excess Filler: As you apply the filler, make sure to smooth it out so that it’s level with the surrounding wall.
- Use the Putty Knife: Once the crack is filled, smooth over the surface with the putty knife to create an even, flat finish.
Step 3: Let The Filler Dry
It is important to allow the filler to fully dry before proceeding with any further work. Here’s how to ensure the drying process goes smoothly:
Drying Time
- Wait 24 Hours: For most plaster fillers, 24 hours is sufficient to allow the product to dry completely.
- Check for Dryness: Before moving on to sanding, ensure that the filler is no longer damp or tacky.
Avoid Touching During Drying
- Don’t Disturb the Repair: While waiting for the filler to dry, avoid touching or disturbing the repaired area to prevent any imperfections from forming.
Step 4: Sand The Area Smooth
Once the filler is dry, the next step is to sand the repaired area to make it smooth and level with the rest of the wall or ceiling.
Use The Right Sandpaper
- Start with Medium-Grit Sandpaper: Begin with a medium-grit sandpaper (around 120-grit) to level the plaster filler.
- Finish with Fine-Grit Sandpaper: Once the surface is relatively smooth, switch to fine-grit sandpaper (around 220-grit) to give the area a polished, smooth finish.
Sand Carefully
- Blend the Edges: Make sure the sandpaper is used gently, and blend the edges of the repair with the surrounding plaster. This will prevent a noticeable transition between the repaired and original areas.
- Keep the Surface Even: Ensure that the repair is flush with the surrounding surface. Avoid over-sanding the area, as this can cause further damage.
Step 5: Clean The Surface
Cleaning the area before painting is essential after sanding.
Dust Removal
- Use a Damp Sponge: Wipe the area with a damp sponge to remove any sanding dust from the surface.
- Let it Dry: Allow the surface to dry before applying paint or any finishing touches.
Step 6: Paint The Repaired Area
The final step is to restore the look of the wall by painting the repaired area. Here’s how to finish off your plaster repair:
Primer Application (Optional)
- Use a Primer: If you are repairing a large section, it may be helpful to apply a primer over the entire wall before painting. This will help the paint adhere better and provide a more even finish.
Paint The Area
- Use a Matching Paint: Select a paint colour that matches the surrounding area. If you’re working on a ceiling or wall, try to match the shade and texture.
- Apply Multiple Coats: For an even finish, you may need to apply two or more coats of paint. Allow each coat to dry before adding another.
Tips For Successful Plaster Repairs
Here are a few additional tips to make your plaster repair project even easier:
Work In Small Sections
- For large cracks, try repairing in smaller sections. Apply filler to one section at a time, allowing it to dry and smooth before moving on to the next.
Use Painter’s Tape (Optional)
- If you need to protect the surrounding areas while repairing, use painter’s tape around the crack to keep paint and filler from spilling onto unwanted surfaces.
Don’t Over-Apply The Filler
- When applying plaster filler, avoid using excessive amounts. Start with a thin layer and build up gradually if necessary, ensuring that the filler doesn’t spill over.
When To Call In A Professional
While repairing cracked plaster can be a DIY job for many homeowners, there are situations when calling a professional is the best course of action:
- Severe Cracks: If the crack is too large or deep, or if it’s caused by structural issues like foundation movement, it’s best to consult a professional plastering company.
- Multiple Cracks: If there are multiple cracks or widespread damage, professional help may be needed to assess and address the cause of the problem.
Conclusion
Fixing cracked plaster doesn’t have to be a daunting task. By following the steps outlined above, homeowners can restore their plastered walls and ceilings to their original condition.
With a little patience and the right tools, you can take care of the problem yourself, saving time and money. However, if the cracks are severe or part of a larger issue, it’s always advisable to seek professional help.
Frequently Asked Questions
How Long Does It Take For Plaster Filler To Dry?
Most plaster fillers typically require 24 hours to fully dry. However, the drying time can depend on the size of the crack and the type of filler used. Be sure to follow the manufacturer’s instructions for the best results.
Can I Paint Over Plaster Filler Immediately?
It’s essential to wait until the plaster filler is completely dry before painting over it. Sanding and cleaning the area after the filler dries will ensure that the paint adheres properly and the repair is smooth.
What Is The Best Filler For Cracked Plaster?
For small cracks, a lightweight plaster filler is ideal. For larger or deeper cracks, opt for a heavier, more durable plaster-based filler designed for structural repairs. Always ensure the filler you choose is compatible with your plaster type.