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How to Dot and Dab
When installing insulation boards to improve thermal efficiency and comfort in your home, the dot and dab method is a simple and effective way to fix them to solid walls. This method can be used with various insulation types, from rigid foam boards to fluffy materials like mineral wool.
Step 1: Prepare the Wall Surface
Start by ensuring the wall surface is clean, dry, and free from dust or debris. Remove any loose plaster or old adhesive. A clean surface is crucial for a strong bond between the insulation board and the wall.
Step 2: Measure and Cut the Insulation Boards
Measure the wall where you’ll be installing the insulation boards. Cut the insulation boards to size using a utility knife, ensuring each board fits snugly against the adjacent pieces without gaps. You can also use a hot wire cutter to cut boards such as EPS for a cleaner edge.
Step 3: Mix the Adhesive
Prepare the insulation adhesive by following the manufacturer’s instructions. Aim for a thick but workable consistency that will hold the insulation board securely to the wall. Use a mixing paddle to ensure the adhesive is free of lumps.
Step 4: Apply the Adhesive (Dot and Dab Method)
There are two main options for applying adhesive to the insulation boards:
Option 1: Perimeter and Dots
We recommend applying the adhesive in a perimeter pattern for most rigid insulation boards, with additional dots in the middle. Specifically, apply the adhesive around the board’s edges, ensuring it forms a continuous line, and place three dots in the middle. The goal is to achieve at least 40% coverage across the board’s surface. This ensures sufficient bonding to the wall while allowing some flexibility for minor imperfections.
Option 2: Full Coverage
You can opt for full coverage for ‘fluffy’ insulation materials like mineral wool, which may not have the structural rigidity of foam boards. In this case, spread a layer of adhesive across the entire surface of the board using a notched trowel. Full coverage provides a better bond for soft insulation types, preventing sagging or uneven surfaces after installation.
Step 5: Attach the Insulation Board to the Wall
Carefully press the insulation board against the wall, starting at the bottom. Apply firm pressure to ensure the adhesive makes good contact with the wall. Use a spirit level to check that the board is straight and level, making any necessary adjustments before the adhesive sets. Gently tap the board into place with a straight edge or block if required.
Step 6: Check Coverage and Alignment
As you continue to install the insulation boards, regularly check for evenness with a long, straight edge. Ensure that there are no gaps between boards and that they sit flush against the wall. If necessary, you can make small adjustments before the adhesive fully dries.
Step 7: Allow to Set and Secure
Depending on the manufacturer’s instructions, the adhesive typically takes 24-48 hours to fully set. For added stability, especially in areas prone to movement, you can secure the insulation boards further using screws and insulation fixings. This is particularly recommended for larger or heavier boards or uneven walls.
Step 8: Finishing Touches
Once the adhesive has been set, fill gaps between the insulation boards with adhesive or a suitable jointing compound. Depending on your project, ensure the surface is smooth and ready for any additional layers, such as plasterboard or render.
Tips for Success:
- Ensure you achieve at least 40% adhesive coverage on each insulation board.
- Full adhesive coverage may be beneficial for uneven walls to ensure a flush finish.
- Regularly check your work with a spirit level to maintain evenness across the surface.
- Choose the appropriate adhesive based on the type of insulation you are using.
When to Use Dot and Dab for Insulation Boards
Dot and dab are particularly effective for installing rigid insulation boards like EPS, XPS, or PIR. It allows you to quickly create a strong bond between the board and the wall while accommodating slight irregularities in the wall’s surface. Full adhesive coverage is often preferable to ensure maximum support and insulation performance for more flexible or soft insulation materials, such as mineral wool.