How To Fix Cracked Plaster For Both Internal And External Walls?

Over time plaster can crack, these hairline cracks are not much to worry about. But if these cracks turn into deeper cracks then you might need a surveyor to investigate.

Repairing Cracks In Plaster
Repairing Cracks In Plaster

Most cracks are just settling or moving in your house, this is normal and your house is not about to fall over.

To correctly fix cracks in plaster there are a few tips to help you succeed and avoid the crack from coming back.

Common Cracked Plaster Areas

There are various areas around the home where cracks are more likely to appear:

  • Around window frames and reveals
  • Going out from a door frame
  • On the ceilings and around light fittings

Fixing Cracks In Plaster

To correctly fix cracks in your plaster you will need a few tools to complete the job:

  1. Sharp knife
  2. Good interior filler
  3. Paintbrush 2 or 3″
  4. Filling knife/scrapper
  5. Bowl of water/PVA
  6. Sandpaper

Once you have all the tools above you are ready to repair the crack so it does not come back the day after filling.

First scrape the paint and loose plaster away with your scraper.

Sharp knife: Cut out the crack so you create a v shape across the crack. Do not scrape to much plaster away, just enough to create a deeper and wider gap you can fill with your filler.

Water/PVA: Mix some PVA and water into a bowl this solution will stop the dry plaster from sucking the moisture to quickly from the interior filler you will be applying next.

Mix Interior Filler: Mix your filler to the right consistency (thick cream) and apply it with the scrapper. Make sure you do not overfill, you should only see the crack white is done correctly.

Sandpaper: Once you have allowed enough time for the filler to dry grab your sandpaper and sand until fingertip smooth. Once your plaster is dry apply more PVA/water solution ready for painting.

Hairline Cracks In Plaster

Hairline cracks appear all over houses but they are nothing to worry about.

If you have plasterboard or internal stud walls then you will experience hairline cracks due to slight movement.

Most newer houses in the UK are brick/block outside and stud wall internally so you are going to get a lot of cracks whilst the house settles.

This can take many years of movement with many hairline cracks all over the house.

The best way to deal with hairline cracks is filler and a sponge. Just apply your filler and rub with a sponge. Leave this to dry, lightly sand and apply your paint.

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