A way of lining a masonry wall by sticking plasterboard to it on dabs of adhesive. The board sits on a shallow void, and the joints are taped and skimmed to finish.

Is dot-and-dab worse than wet plaster?

Not inherently. It is faster and better on uneven walls, but it is the wrong answer on damp-prone solid walls and where heavy fixings are needed without planning.

How long does wet plaster take to dry?

It depends on thickness, ventilation and heat. Plaster changes to a uniform pale colour when it is ready, and painting it before that is the usual cause of peeling emulsion.

Can you hang a TV on a dot-and-dab wall?

Yes, but the fixing needs to go through the board and into the masonry behind with a spacer or resin fixing, so the bracket loads the wall rather than the board.

Which is better for soundproofing?

Neither is a soundproofing system on its own. Where sound is a priority, an independent or resilient-bar lining with acoustic insulation outperforms both.

Materials & Comparisons

Dot and Dab Plasterboard vs Wet Plaster

Name: Mighty Oak Construction
Address: Tunbridge Wells, Kent, TN1, GB
Telephone: 07850 357962
Price range: ££

Dot and dab means fixing plasterboard to a masonry wall on dabs of adhesive, then taping and skimming it; wet plaster is applied straight onto the masonry. Dot and dab is quicker and copes with uneven walls, while wet plaster is more solid and safer on damp-prone solid walls. When an internal wall is stripped back to masonry there are two mainstream ways to finish it, and tradespeople have strong preferences. The right choice depends on how flat the wall is, how quickly the room is needed, whether the wall is damp-prone, and what will eventually be screwed to it.

How each method works

Wet plaster — float and set — means a backing coat applied directly to the masonry and ruled flat, then a finish skim. The plaster is in continuous contact with the wall.

Dot-and-dab fixes plasterboard to the wall on dabs of adhesive, then the board joints are taped and the surface skimmed. The board sits on a shallow void.

The practical differences

Speed and moisture are the two that affect a renovation schedule most. Wet plaster puts a large volume of water into the building, and a heavily plastered house needs weeks of ventilation and heat before it can be decorated properly.

Flatness: dot-and-dab copes far better with a wavy or out-of-plumb wall
Drying: boarding is faster to decorate over; wet plaster needs longer
Sound and solidity: wet plaster feels more solid and avoids the drummy sound of a void
Fixings: heavy items need noggins, dot-and-dab fixings or fixing back to masonry through the void
Cost: dot-and-dab is usually quicker on labour, wet plaster uses more time per square metre

Old and damp-prone walls

On a solid wall with any history of damp, the void behind dot-and-dab is a liability: moisture can track behind the board and mould develops out of sight. Continuous adhesive beds or a breathable wet plaster system are the safer specifications there.

In period properties with lime-plastered solid walls, gypsum on either method can trap moisture. Lime plaster on a lime background lets the wall behave as it was built to, and matters most where original fabric is being retained.

What we specify by default

For a new stud or a very uneven old wall, board and skim. For sound masonry in a room where solidity and fixings matter — kitchens, hallways, anywhere with wall-hung units — float and set. For a solid wall with damp history, the method is chosen after the damp is resolved, not before.