Air Tightness Testing

Frequently Asked Questions

Why do I need an Air Leakage Test?

Air Tightness Testing, also known as Air Leakage Testing, Air Permeability Testing or Pressure Testing is mandatory under Part L1A of the 2006 Building Regulations. The Air Leakage 'score' is used in the SAP calculations to give the new home a final environmental rating. This is required by Building Control to provide the Building Regulation Certificate on completion of the property.

Why is air tightness important?

Uncontrolled air leakage in a dwelling makes homes more expensive to heat, they are draughty and are susceptible to potential failure of the envelope fabric due to condensation.

Aren’t homes supposed to breath?

Yes, but in a controlled way. Uncontrolled air leakage is not an appropriate way to ventilate a dwelling. An air tight house, combined with controlled ventilation is a much more comfortable and energy efficient home. Approved document F of the Building Regulations requires all new homes to have an appropriate controlled ventilation system. This can be achieved through extractor fans in ‘wet’ rooms and trickle vents or better still by incorporating a whole house mechanical ventilation system.

What is involved in an Air Leakage Test?

We require a set of scale plans from you a few days before we carry out the test. We use these to calculate the total envelope, volume and floor area of the property.

The on-site test involves depressurising the property using a computer controlled fan fitted into a temporarily sealed door opening. We seal certain allowable openings including chimneys and extractor fans and ensure all doors, windows and trickle vents are closed.

We take a number of readings at various pressures to give a final accurate result. The pressure changes in the house are small and therefore should not cause any structural damage.

How long does the Air Leakage Test take?

The on-site test takes about an hour and we can normally give you confirmation of a pass on the day. Contractors and other personnel can still work inside the property as the test is undertaken.

At what stage is the Air Leakage Test carried out?

The Test is usually undertaken after second fixing has been completed.

What happens if our property fails the test?

Our role is to help ensure your property passes the test. We can provide you with practical information prior to the test to ensure the property passes. If your property was to fail, when possible, we give you time to make improvements to the property so that we can do a re-test on the day at no extra cost. If it is not practical to carry out the improvements on the day we will give you full information on where the problems are together with tried & tested advice on how to take remedial action prior to a re-test (which would be charged at a discounted rate).

What does an Air Leakage Test measure?

An Air Tightness Test measures the number of cubic metres of air that are lost through each square metre of envelope area per hour, at a pressure difference of 50 Pascal’s (m3/(m2.hr)@50Pa). Every new home must achieve a score of 10m3/(m2.hr)@50Pa or less. The lower the figure the better the properties overall SAP rating leading to a better environmental energy rating (improving a properties sales appeal).

Why should I use Midland Energy Services?

We are members of the Royal Institution of Chartered Surveyors, the British Institute of Non Destructive Testing and we are fully accredited to carry out our services to fulfil Building Regulation requirements. Our qualifications mean that Building Control do not have to be present at the on-site test.

Because we can also carry out your SAP calculations and Code for Sustainable Homes Assessments we provide a cohesive service saving you money as well as helping you to achieve as good an overall environmental rating as possible.

We also carry PI insurance of £1m.

What area does Midland Energy Services cover?

We cover the Midlands and further a field. We are strategically placed to cover a wide area quickly, efficiently and cost effectively.

How much does it cost?

We provide a highly cost effective service. Either fill out the quote section on the website, fax us on 01949 859020, give us a call on 01949 859859 or email us at info@midlandenergyservices.co.uk for a fast, highly competitive quote.

For larger developers we are also able to offer very attractive contract arrangements.

Midland Energy Services; Lilac House; Flawborough, Nottinghamshire NG13 9PA

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