PASSIVHAUS CONSULTANTS

We can help your building project achieve a PassivHaus standard 

AIR TIGHTNESS TESTING

Low Carbon Box provide competitive air tightness testing with excellent customer service

WHY USE US?

EXPERTISE

We meet the requirements set out in Building Regulations Part L1A and L2A and are ATTMA registered

PROJECT SUCCESS

If the air test fails, we will detect the leaks, allow local repairs and retest on the day!

TECHNICAL

We use UKAS Calibrated air tightness testing kit and our staff are CSCS accredited

ADDED VALUE

We have flexible, competitive rates with significant discounts for multiple air tightness testing.

AIR TESTING TESTING by Low Carbon Box

We manage energy calculations and Air Tightness testing and understand requirements for managing this. Our office will make the appointments and our site team will attend site.

Our quality and value offering is as follows:

  1. Provide competitive pricing
  2. Rapid response to set up site test and arrange the air tightness testing as soon as is convenient. Confirm the appointment via email. Check air tightness testing requirements. Can the scores be relaxed? Can we sample air test?
  3. Provide risk assessments and method statements together with their tightness. Testers details are provided along with a copy of their CSCS card.
  4. Air tightness testing carried out in full compliance with Part L1A 2013 and our air tester is ATTMA Accredited. All certificates will be lodged and issued.
  5. Provide air tightness testing checklist and guide so you can be ready for the air testing and stand a better chance of passing
  6. Same day issue of air tightness certificates

What is air tightness testing?

What is air tightness testing? (Also known as Air Permeability testing or Air Pressure Testing). This is the process of extracting air at a high rate to create a pressure difference of 50Pa between the inside and outside using a large fan that fits within the external door. We can then measure how leaky the building fabric is and identify where the leaks may occur.
 
Before air tightness testing is carried out, measurements are carried out in accordance with the ATTMAPublication,  Measuring air permeability of building envelopes (dwellings) as set out in Paragraph 3.14 of Part L1A 2013 of the Building Regulations.

Why do you need to provide air tightness testing?

Every new dwelling requires air tightness testing in order to determine the air permeability in m3/hr/m2. For each new dwelling, there should be a SAP Calculation carried out to demonstrate compliance with Part L1A 2013 of the Building Regulations. Within this assessment, the air permeability target is set and can vary up to a maximum of 10m3/hr/m2 depending on other factors.
 
The purpose of the air tightness testing is to check uncontrolled air leakage. The higher the air leakage, the more heat loss occurs. Uncontrolled air leakage also causes draughts which can cause occupants to turn the heating up to feel warmer.
 
Good air permeability with correctly specified controlled ventilation such as trickle ventilators and extracts along with operable windows should provide the occupant with adequate means to maintain good indoor air quality balanced with reduced heating bills.

Which properties need air tightness testing?

Building Regulations requires that each dwelling is air tested. However, you can provide sample air tightness testing if you can achieve 2m3/hr/m2 below the air permeability target. If sample air tightness testing is undertaken, then at least 50% or 3 of beach house type (which ever is less) must be undertaken.

For example, if you have 4 x House Type A and the air tightness target = 7m3/hr/m2. The by testing 2 of house type A and achieve 5 m3/hr/m2 would allow the untested plots to pass (subject to agreement with the SAP energy assessor).

Are you building a new self build house to live in or sell? Then you need an air tightness test. Using Low Carbon Box, we can offer initial help and advice to help you seal the self build house as you progress the build to provide a much better chance of passing the final air tightness test.

How is air tightness testing carried out?

 Before air tightness testing is carried out, measurements are carried out in accordance with the ATTMAPublication,  Measuring air permeability of building envelopes (dwellings) as set out in Paragraph 3.14 of Part L1A 2013 of the Building Regulations.
 
Our ATTMA Accredited air tightness tester will attend site with the UKAS calibrated air tightness testing equipment and install a sales door into the front entrance. The Main fine is then installed into the temporary door.
 
All controlled ventilation such as trickle ventilators, extract fans, cooker hoods should be temporarily sealed for the test.
 
Site personnel can remain within the property during the air test and carry on working. But no windows or doors should be opened during the air tightness testing.
 
The fan extracts air from the property during the air tightness testing to create a pressure difference of 50 Pa (pascals) in order for the air tester to detect leaks and measure how much air leakage is occurring. A series of readings are taken and the average reading. The total air flow (m3) is divided by the surface area (m2) to achieve the rating of m3/hr/m2.

Getting ready for your air tightness testing

Our ATTMA accredited air tightness tester will be in touch to confirm the agreed date and time for the air tightness test. We will check and if required, advise on the following:
•     Confirm what air tightness target is required
•     Confirm what date and time is convenient
•     Provide air tightness testing checklist and guide to review and be ready for the air test
•     If a fail occurs, then provide on-site leak detection to advise what areas are leaking. If personnel are available to rectify the leak, then we can stay to retest should our schedule permit this.
•     Same day certificate release

Most common mistakes for air tightness testing

The architects drawings generally show the internal air tightness barrier. But below are details and areas to think about that are not generally shown on the drawings
 
•     Services such as water pipes, drain pipes and other wall and floor penetrations. Ensure these are sealed before and after plasterboard, but before you fit your kitchen or bathroom. See further guidance here – https://www.lowcarbonbox.co.uk/seal-your-services-to-pass-your-air-tightness-test/
•     Behind bathroom showers, toilets and wash hand basins leak due to services not being sealed before fitting.
•     The sample applies to kitchens, the corner soil stack is generally not sealed and the soil stack boxing acts like a chimney when the air test is carried out. Seal the top of the stack in the loft (fire collar or similar) and provide mineral wool surround to soil stack pipe to reduce heat loss and air flow.
•     Plasterboard on dabs onto blockwork – The air gets pulled through the gaps between the clockwork and around openings and via services going through the clockwork. The air then runs behind the plasterboard. Extra care on sealing before plaster boarding will help.
•     Ensure continuous plasterboard dap to the perimeter of the wall and around sockets and services
•     Further details of this at the following page – https://www.lowcarbonbox.co.uk/air-tightness-testing-issues/

Call us on 01858 322011 or click below for further contact details

Below will take you to a contact page with email address and contact form

WHAT WE DO Steps in our work

LOW CARBON BOX are based in Leicestershire and ideally located to air test nationwide.
We recommend our air tightness testing services from early design stage to assist in achieving Building Regulation compliance and provide easy integration with a successful outcome.

INITIAL CONSULTATION

Discuss your project and get advice. We also provide a checklist to help you along. We will need your drawings and SAP Calculations.

TESTING

We will attend site at an agreed time and test the unit(s). If a failure occurs (see air tightness testing issues), then we will check for leaks and allow any works to be carried out and re-test within the hour.

RAPID RESULTS

We tell you the result on the day and email the certificates and report as soon as we get back to the office.

ACCREDITED

We are ATTMA registered air testers with fully calibrated equipment. We also hold CSCS cards for site health and safety.

VALUE

We offer flexible payment terms and bulk discount for joint services (SAP, SBEM etc). We offer air tightness testing in Birmingham, Midlands, Leicester, Lincoln, Milton Keynes, Essex, Tamworth, Hinckley, Northampton, Nottingham, Mansfield, Boston, Luton

What is Air Tightness Testing?

What is air tightness testing? (Also known as Air Permeability testing or Air Pressure Testing). This is the process of extracting air at a high rate to create a pressure difference of 50Pa between the inside and outside using a large fan that fits within the external door. We can then measure how leaky the building fabric is and identify where the leaks may occur.

Before air tightness testing is carried out, measurements are carried out in accordance with the ATTMA Publication,  Measuring air permeability of building envelopes (dwellings) as set out in Paragraph 3.14 of Part L1A 2013 of the Building Regulations.

All we need is plans and sections to carry out this measurement.

With our excellent background knowledge in sustainable design, assessment and testing, we are ideally suited to support you on your self build project. See the  example of the Essex Eco House.

We check what you need

We check the SAP Calculation for the target air permeability for each plot, then we know if we can test just a few and to what standards we need to achieve.

The target air permeability for the building is a maximum of 10 m3/hr/m2. However, the results of the SAP Calculation (which determines the maximum carbon emissions of the building) is likely to mean this target reduces significantly.

The actual target for air tightness testing may be 4 or 5m3/hr/m2 which means the building has to have 50% less uncontrolled air leakage to pass Building Regulations.

Air Tightness testing

We give you support and guidance

We will send an air tightness testing checklist before we test so you can check everything is complete and ready for the air test.

The most common areas for failure includes where the soil and vent drainage pipe runs vertically through the building. This is boxed in by plasterboard. But the blockwork behind it is unsealed and very often, this acts like a chimney.

Ensure the SVP is sealed att the top and where the bathroom and kitchen connects to the pipe. Also seal the base ad sides of plasterboard prior to installing the kitchen and bathroom.

Further tips HERE

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