Services > Air Tightness

DMcL Plastering Ltd specialises in airtight solutions.  We install airtight membranes to prevent un-planned air into and out of a building such as draughts around windows and doors, unwanted cracks in the structure and around services as they enter the building. This flow of air is gauged by means of a Blower Door Test which became a requirement for all new buildings.

The prevention of these draughts involves designing and installing a continuous seal around the internal fabric of the external envelope of the building. Once the airtight membrane is in place and sealed with tapes, seals and glues, it ensures that the insulation functions to its optimum performance, saving energy and drastically reducing carbon emissions for the lifetime of the building. 

Air Tightness Gallery

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The advantages include


1. Reduced heating costs
Airtight products will save energy and dramatically reduce your heating costs. Warm air is not allowed escape through gaps and cold air is not allowed to blow into your home, resulting in:

  • Substantial ongoing savings in heating costs
  • Reducing of your carbon footprint
  • Improving the energy rating of your home
  • Increasing future resale of your home
  • Protecting your home against condensation

  • 2. Improved comfort
    In the absence of an airtight envelope, cold air coming in through unsealed points is heavier than the warm air in your house. This cold air falls to the lowest point in the room - the floor. Cold floors result in cold feet, no matter how effective your heating system.

    3. Outperform Building regulations
    In July 2008 the new Part L Building regulations came into effect. These new regulations introduced specific airtightness requirements for the first time. This requirement translates to an air permeability rate of 10m3/(hr.m2) at 50 pascals. Compliance to these standards will be measured by air pressurisation tests known as the Blower Door Test.


    DMcL Plastering will provide a standardisation of robust airtight details designed to ensure the following: -

  • Compliance with building regulations
  • Quality detailing to achieve excellent blower door results

  • 4. Improved Air Quality
    Draughts through internal walls are not beneficial to the atmosphere in your home, as dust and insulation fibres can be circulated. Airtight membranes and tapes ensure any dust and fibres remain in your wall cavity and do not escape into the atmosphere in your house.

    5. Protect from condensation
    When using air tight membrane barriers your house can breathe and moisture in the air can pass through your walls and evaporate.

    Dangers of uncontrolled condensation:

  • Deterioration in the U-value of your insulation
  • Build up of mould, mildew & fungus that can lead to health problems
  • Structural damage due to rotting timber
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    Blower Door Test