How to Dot and Dab Plasterboard — Step-by-Step UK Guide

What You'll Need

Before You Start

• Check the wall is dry, structurally sound and free from loose material. Hack off any blown plaster or flaking paint.
• Run cables and pipes before boarding — they must be chased in or clipped to the wall surface. Mark their positions so you can avoid them when fixing later.
• Plan your socket and switch positions and cut out openings before offering the board up to the wall.
• Stack boards flat in the room for at least 24 hours before fixing to acclimatise.
• Use our Dot and Dab Calculator to work out adhesive quantities and our Dry Lining Calculator for board quantities.

Step-by-Step Instructions

Step 1: Prepare the Wall Surface

Remove any loose plaster, dust, grease or paint. On bare blockwork or brickwork, mist with water to reduce suction. On painted surfaces, score with a bolster or use a bonding agent. The adhesive needs a clean, stable surface to bond properly.

Step 2: Set Out Datum Lines

Use a plumb line or laser level to establish a true vertical datum line at one end of the wall. Measure the maximum deviation of the existing wall from plumb — this determines the thickness of your dabs. Mark board positions on the floor and ceiling.

Step 3: Mix the Adhesive

Add the powder to clean, cold water in a large bucket (follow manufacturer's ratio — typically about 10-12 litres of water per 25kg bag). Mix with a paddle drill until you get a thick, creamy consistency with no lumps. Only mix enough for about 20-30 minutes of work — the adhesive has a limited working time.

Step 4: Apply the Dab Pattern

Apply a continuous ribbon of adhesive along the top and bottom of the board position (this helps with fire stopping). Then apply dabs at approximately 300mm vertical centres in three or four rows across the width. Each dab should be about 50-75mm in diameter. Apply extra adhesive around socket and switch locations.

Step 5: Offer the Board to the Wall

Lift the board into position — use a foot lifter or timber wedges to raise it approximately 10mm off the floor. Press the board firmly onto the dabs. The board should sit tight against the adhesive ribbons at top and bottom.

Step 6: Check Plumb and Alignment

Use a long spirit level or straight edge to check the board is plumb and flat. Tap gently with a rubber mallet or palm of your hand to adjust. Check alignment with adjacent boards using a straight edge across the joint. Work quickly before the adhesive begins to set.

Step 7: Continue Boarding

Repeat for each board, working along the wall. Stagger joints if boarding a full room. Leave a 3mm gap between boards for jointing. Ensure all boards are flush with each other — even a 1mm lip shows through when skimmed.

Step 8: Tape and Joint

Once the adhesive has cured (at least 24 hours), apply jointing tape to all board joints. Fill with jointing compound and feather the edges. Once dry, apply a skim coat or finish as required.

Common Mistakes to Avoid

• Not checking plumb: If the first board is out of plumb, every subsequent board will follow. Always check the first board carefully with a long spirit level.
• Mixing too much adhesive: Dri-Wall adhesive sets quickly. Only mix what you can use in 20-30 minutes.
• Using insufficient adhesive: Skimping on dabs leads to hollow areas and boards popping off. Use the full dab pattern with perimeter ribbons.
• Boarding over damp walls: Trapping moisture behind boards causes mould and adhesive failure. Fix damp problems first.
• Not leaving a floor gap: Boards sitting directly on the floor wick up moisture. Always leave 10mm and use a foot lifter.
• Forgetting cable positions: Once boarded, you cannot see what is behind. Mark cable routes before boarding and photograph them.

Cost Estimate (2026 UK Prices)

Use our Dot and Dab Calculator and Dry Lining Calculator for exact quantities for your project.