Air Permeability Testing - for Part L1A of the Building Regulations

So, what is Air Permeability Testing?

Within the Building Regulations, Air Permeability (also known as Air Tightness or Leakage) is defined as '...a general descriptive term for the resistance of the building envelope to infiltration with ventilators closed.'


What this means in English is that this refers to the amount of unplanned (i.e. not through normal, planned ventilation) air escaping from a property.


What does it do?

An Air Permeability Test is designed to measure the rate at which air escapes from a property at a specific pressure difference. This is measured in cubic metres of air lost, per hour, per metre squared of building envelope at a pressure difference of 50 Pascal.


The higher this measured rate is, the more air is escaping and vice versa.


Why is it needed?

As part of 2002 Government Legislation, all new build dwellings require this testing. It is also vital as the measured rate of air leakage is used within the 'As Built' SAP assessment.


This is because air leakage is a significant cause of heat loss and therefore plays an important part in calculating the energy efficiency of a dwelling.


How we can help?

Our team of experienced testers will ensure that this goes as smoothly as possible for you, by offering the following:


1. Pre-test Advice - Our team are always happy to answer any queries that you might have regarding anything from how to prepare your build for testing, to general air tightness advice.


2. Full UK Coverage - With testers across the entire UK, there is nowhere too far for our team to help.


3. On-site Assistance - Failed the first test? Not a problem as our testers will always try their best to assist you in passing your test on the day.


4. Same Day Reports - Our testers can let you know the results of your test immediately, with full certification also issued same day.


And, if you have also taken advantage of our SAP service (either individually, or as part of our full compliance package) then there is absolutely no delay in getting the result over to your assessor to continue your 'As Built' SAP assessment.

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