& Sound Testing in One Easy Package
Pressure Testing LTD achieves the lowest air leakage rate in the UK
A UKAS Accredited Company
Accredited to ISO/IEC 17025:2005
For Air Tightness & Sound Insulation Testing
Registered in England & Wales No. 527550
Air Pressure Testing offer Simple solutions to your Air
Test & Air Leakage problems based on years of practical on-site
• Rapid turnaround of Air Test & Air Leakage quotes.
• Easy to read Air Test & Air Leakage quotes with all costs
• Fast, simple and efficient administrative system.
• Pre-site Air Test & Air Leakage service visits. (A small charge
is made for this service.)
• Simple, reliable and accurate on-site Air Test & Air Leakage
procedures that comply with the latest revised standards.
• Non intrusive Air Test & Air Leakage Testing methods
• Saturday & Sunday as well as out of hours working up to 22.00
• Flexible test times to suit YOU.
• Quick response for a test. (This can be as little as 24hrs if
all the details are made available to us, to include the envelope area
and the volume of the building along with the Air leakage rate you need
• Friendly, knowledgeable staff on all tests.
• Our aim is to get you a Pass!
Air Leakage Checklist
What if your building fails?
In the event of a fail, smoke testing and thermal imaging can determine
the main areas of leakage. We often provide this service on the test day
to allow immediate rectification and re-test. A full pictorial and written
report is included.
Questions answered for the Air Leakage
Testing Of Dwellings:
The Design Air Permeability for each dwelling type within a development
will be determined by designers as part of the overall DER (Dwelling CO2
Emissions Rate) calculation. The maximum design air permeability allowable
(is 10 m3/(m2.hr) @50Pa.
Sample testing is required of each dwelling type on each development.
Building Control will identify the (early) units to be tested. The sample
size depends on whether ‘Robust Details’ have been used:
If Robust Details adopted, test one of each dwelling type on each development.
If any fail, do remedial work, test again plus another dwelling of the
same type on same development
If Robust Details not adopted, the number of tests to be carried out on
each dwelling type on each development are as follows:-
• 4 or less dwelling types - test one of each
• Between 5 and 40 types - test two of each
• Above 40 types - test 5% of each. For each type, this can reduce
to 2% if the first 5 tests are successful.
A relaxation Applies until Oct 2007. If the first test fails, the target
becomes either 75 % of difference between 1st test result & the target,
or the target is increased by 15% - whichever is the higher. A higher
air permeability test result can be accepted if the recalculated DER remains
better than the TER (Target CO2 Emissions Rate) - in spite of the higher
air permeability rate
Small Developments (2 units or less). An alternative to testing is to
either prove that a satisfactory test result has been achieved on another
dwelling of the same type in last 12 months, or use an assumed leakage
rate of 15 m3/(m2.hr) @ 50 Pa in the overall carbon emissions calculation.
Blocks of Flats have to be considered as separate developments, regardless
of how many are on the same site.
Testing Companies engaged to carry out tests under this revision of the
Approved Document should be members of the British Institute of Non-Destructive
an electronic copy of Approved Document L1A here
Questions answered for the Air Leakage Testing
The Design Air Permeability for the building will be determined by designers
as part of the overall BER (Buildings CO2 Emissions Rate) calculation.
The maximum design air permeability allowable is 10 m3/(m2.hr) @50Pa.
A reduced Design Air Permeability (i.e. a high level of air-tightness)
will serve to further reduce carbon emissions and make the TER easier
to achieve. It may also mitigate the cost of more expensive carbon emission
A relaxation Applies until Oct 2007 on Buildings with less than 1000m2
Gross Total Useful Floor Area. If the first test fails, the target becomes
either 75% of difference between 1st test result & the target, or
the target is increased by 15% - whichever is the higher.
A higher air permeability test result can be accepted if the recalculated
BER remains better than the TER (Target CO2 Emissions Rate) - in spite
of the higher air permeability rate, providing the air test result remains
below 10 m3/(m2.hr) @50Pa.
Consequences of Failing an Air
Test: remedial works must be carried out and the building retested
until the required result is obtained. From ADL2A “If it proves
impractical to meet the design air permeability, any shortfall must be
compensated through improvements to subsequent fit-out activities.”
Buildings below 500m2 Total Useful Floor Area. Testing of these smaller
non-residential buildings is optional. However, if testing is not carried
out, an onerous air permeability rate of 15 m3/(m2.hr) @50Pa must be assumed
and used in the overall BER calculation.
Other buildings types that need not be tested include, subject to certain
qualifications: modular, factory-made buildings, large extensions (that
are large enough to be assessed as a new building) that cannot be sealed
off from the existing building, large complex buildings, and compartmentalised
buildings. See ADL2A and ATTMA TS1 for detailed guidance.
• Extensions to Existing Buildings, are covered by L2B, unless their
Useful Floor Area is more than 100m2 and is more than 25% of the total
useful floor area of the existing building. In these cases ADL2A applies,
and, depending on size will require air permeability testing.
• Testing Companies engaged to carry out tests under this revision
of the Approved Document should be members of the British Institute of
an electronic copy of Approved Document L2A here
Air Tightness Testing
Air Pressure Testing Ltd offers a complete range of technical Air Tightness
testing, Thermographic surveys and consultancy services to help clients
gain compliance to Part L.
Please use the following link to understand the services Air Pressure
Testing Ltd offers, from air tightness and smoke tests, to Acoustic Testing
and Thermographic surveys and various consultancy services
Air tightness, Smoke Tests, Acoustic
Testing and Thermographic Services
Air Test Services
When providing Air Test
services to our clients we are able to provide a personal, helpful, efficient
and cost effective service. When contracting for Air Test services, Air
Pressure Testing strive to give you clear accurate answers without the
hype, so you can make informed decisions. Air Pressure Testing have many
years experience and have evaluated hundreds of homes and commercial structures
for air test, acoustic and air leakage testing issues.
Air Pressure Testing air test technicians will be able to
surrey and report on air quality problems in your home or commercial property
that can affect you or your family’s/employees health, comfort and safety.
Our indoor air test technicians use state of the art equipment to surrey
and monitor your environment to measure temperature, humidity, carbon
dioxide, carbon monoxide, and other issues within the environment.
^^back to top