Record a plasterboard crack before covering it
Take a clear photograph with the date and location. Include a familiar scale beside the crack without disturbing the wall. A wide view of the room or opening is useful alongside the close-up. Note whether the line follows a sheet joint, runs from a corner or crosses several surfaces.
If you notice movement over time, keep the photographs together. The home maintenance checklist gives you a way to combine this with door, window and moisture observations.
A decorative repair can be straightforward, but a photograph alone cannot establish whether a crack is only cosmetic. Sudden or significant change, bulging material, moisture damage or several related symptoms deserve assessment before filling.
Common crack patterns and useful questions
| What you see | What to ask or record |
|---|---|
| A line along a board joint | Has the joint been repaired before, and is the surrounding board secure? |
| A line from a door or window corner | Has the opening started sticking or changed shape? |
| Cracking beside a damp or stained area | Is a moisture source still affecting the lining? |
| A small impact mark | Is the damage shallow, or does it extend through the board? |
GIB’s repair guidance recognises building movement and high-stress areas around openings as factors in cracking. The repair needs to suit the particular defect and the lining system, rather than treating every line as the same job.
What a plasterboard crack repair involves
The work can include checking the surrounding lining, removing unsound material, repairing the joint or damaged area with a compatible system, allowing the compounds to dry and preparing the surface for decoration. A recurring joint crack may need more than a smear of filler.
Fire-rated, bracing and other specified wall or ceiling systems must keep their required performance. Have the system identified before changing its boards or fixings. Our home and property repairs service can help establish the appropriate scope and any specialist assessment needed.
When damage is associated with a leak, address the water source first. Our ceiling water damage guide explains the sequence from investigation to finishing.
Plan the painting as part of the job
A flat patch and a matching finish are separate parts of the repair. Colour, sheen, texture and the direction of daylight affect how a repaired area looks. Discuss whether the work finishes at the patch, the whole wall or the whole ceiling.
Clear furniture from the agreed work area and discuss protection, dust and access before the visit. Allow the repair products and coatings the drying time they need; rushing straight into painting can compromise the finish.
If the existing coating is lifting as well as cracking, see our paint peeling guide. We can include related preparation and painting and decorating in the conversation so the scope is clear.
Your questions
Are all plasterboard cracks structural?
No, but the appearance of a crack alone cannot establish its cause. Its pattern, changes over time, moisture and other symptoms help determine whether wider assessment is needed.
Why does the same crack keep returning?
The underlying movement, joint condition or moisture problem may still be present. Tell us about previous repairs so the cause can be considered before another patch is applied.
Send the whole wall, then the detail
A wide photo shows the crack in context; a close-up shows its shape. Tell us when it appeared, whether it has been repaired before and whether nearby doors or windows have changed.
Tell us about the crack