Wet Plaster vs Dot-and-Dab Plasterboard

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.

Frequently asked questions

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.