What this work covers
Wall plastering corrects rough concrete and masonry, bridges joints between different substrates, and establishes a plumb, flat base for wallpaper, paint, or tile. The work includes substrate preparation and reinforcement as well as the visible plaster coats; a smooth top surface alone cannot stabilise a weak joint below it.
When this work is needed
It is needed where demolition has left rough walls, where new masonry meets concrete or plasterboard, or where corners and openings need a true line. Agree the required finish first, because paint, wallpaper, and tile expose different levels of waviness and demand different preparation.
Decide before plastering starts
Set the repair boundary and acceptance standard from the finish that will follow.
- Walls receiving full plaster and areas receiving only local repair
- Flatness and plumb required for wallpaper, paint, or tile
- Mesh reinforcement across masonry, concrete, and board junctions
- Corner-bead locations at exposed corners, reveals, and frame edges
- Number of coats and curing time between coats and before finishing
Check in the quote
Area, average thickness, coat sequence, and reinforcement should be visible separately.
- Are full-plaster and local-repair areas and average thickness stated by room?
- Are contamination, loose material, and bonding preparation included?
- Are base and finish coats plus curing between them described?
- Are mesh at mixed substrates and corner beads included by location?
- Are flatness, plumb, hollow-area, crack, and pre-finish inspections included?
If you have post-demolition wall photographs or a plastering quote, I can help separate full plaster from local repair and check the missing reinforcement.
What to check on site
The finish cannot hide a wall that is out of plane or cracking at every material change. Reinforce the weak boundaries, establish clear reference points, and let each coat cure.
- Base Treatment and Reference Points Complete
Remove loose mortar and contamination, apply the specified bonding treatment, and place mesh across every mixed-material joint. Fix corner beads and set reference points across the wall so the completed thickness, plumb, and openings are known before coating. - Base and Finish Plastering Complete
Press the base coat firmly into the prepared substrate and allow it to cure before the finish coat. Rule between the reference points, remove high areas, fill low areas, and refine the surface without leaving abrupt hollows or heavy trowel ridges. - Curing, Inspection, and Cleanup Complete
Protect the wall from direct sun, strong wind, impact, and early loading while it cures. After drying, use side lighting and a straightedge to find cracks and waviness, check corners and frame edges, and repair them before handing the wall to the finish trade.
Where problems usually start
- Wall outside the flatness tolerance Waves and steps remain visible through wallpaper and paint and force uneven adhesive thickness behind tile.
- Mixed-material joint without mesh Different shrinkage at masonry, concrete, and board boundaries can reopen as a crack through the finish.
- Plaster dried too quickly Direct sun or strong air movement removes moisture before curing and produces surface cracks.
- Loose corner bead A poorly fixed bead allows the plaster edge to lift and makes the corner vulnerable to impact.
Do not start wallpaper, paint, or tile while the plaster is still damp. Let it cure, then check flatness, plumb, corners, hollow areas, and mixed-substrate cracks under the light that will reveal them.
Keep the plaster area and thickness, substrate preparation, mesh and bead positions, coat and curing dates, flatness and plumb results, and crack-repair photographs.
Timing and records
Allow about 16 to 24 hours of site work, excluding curing. Wall condition, thickness, and the balance between full plaster and local repair can change both work and waiting time.
Record the treated area and thickness, mortar and reinforcement products, mesh and bead locations, coat dates, curing protection, flatness and plumb checks, and repaired cracks.
Wall plastering follows masonry and becomes the substrate for wallpaper, paint, and tile, so the finish standard needs to be agreed across those trades.