HRS is the market leader in Air Tightness Consultancy and Testing, with over 30 years experience of providing practical and technical advice, ensuring that our clients have cost-effective solutions and their risks are minimised. Two way communication ensuring that your project hands over on time and in budget is HRS’s number one priority.
Something HRS cannot emphasise enough is to contact HRS early, even if you think it’s too soon to be thinking about Air Tightness it is never too soon, a call to HRS will cost you nothing but could save you lots – HRS are here to help.
On most occasions, HRS highly trained and experienced Air Tightness Technicians will be able to locate the problem areas and identify where air is leaking out of the building by walking round the site with a smoke pencil checking the most common problem areas first.
If required HRS can use a fan and a smoke generator to do a full building smoke test, however on 99% of cases HRS find that by using an experienced HRS Air Tightness Technician and a smoke pencil, the problem areas can be located.
For clarity as it is a question HRS get asked a lot when carrying out full building tests, the smoke will cause no damage to the building, however the building does needs to be emptied of all people for Health and Safety reasons. HRS also recommend that the Fire Brigade is informed to avoid unnecessary call outs. The smoke is a harmless food grade water based monopropylene glycol (MPG), but it is a good idea not to expose fresh food or produce to it.
A fan pressurisation unit blows the smoke out through any holes, gaps or cracks in the external building envelope, rendering the air paths visible. Smoke leaking from the building can be seen outside, and photographed to provide a record of external leakage paths. Smoke tests are ideal for identifying generic areas of air leakage.
HRS have worked on a number of Passivhaus schemes, so have extensive practical and technical experience. A Passivhaus project and an award winning building that HRS were heavily involved in is the prestigious Passivhaus Interserve Offices in Leicester.
The HRS Passivhaus air tightness consultancy service will ensure you get the right advice at the right stage to achieve the Passivhaus standard. It is crucial if you are working to the Passivhaus standard that you contact HRS early – it never to soon to contact us.
- Good levels of insulation with minimal thermal bridges
- Passive solar gains and internal heat sources
- Excellent level of airtightness
- Good indoor air quality, provided by a whole house mechanical ventilation system with highly efficient heat recovery
There are no strict requirements with respect to domestic hot water, lighting and appliance consumption. The standard imposes an overall limit on the Primary Energy consumption which promotes energy efficiency in all of these areas.
|Energy performance targets and air changes per hour|
|Specific Heating Demand||≤ 15 kWh/m². yr|
|Specific Cooling Demand||≤ 15 kWh/m². yr|
|Specific Heating Load||≤ 10 W/m²|
|Specific Primary Energy Demand||≤ 120 kWh/m². Yr|
|Air Changes Per Hour||≤ 0.6 @ n50|
|Design Component||Limiting value|
|Walls, Roof, Floor (U-values)*||≤0.15 (W/m²K)|
|Glazing unit||≤0.8 (W/m²K)|
|Installed glazing||≤0.85 (W/m²K)|
|Infiltration (ach-1)||≤0.6 @ n50|
|Thermal bridging (linear ψ value)||≤0.01 (W/mK)|
|MVHR coefficient (η HR)||≥0.75|
|Ventilation electric limit||0.45 Wh/m3|
|Appliances||High efficiency recommended|
|Lighting||High efficiency recommended|
|On site renewables||No requirement but SHW typical|
If you are able to use Passivhaus technology for all relevant building components in your existing buildings, it will lead to substantial improvement in respect of thermal comfort, structural protection, cost-effectiveness and energy requirements.
|Specific Heat Demand||≤ 15 kWh/m².yr||≤ 25 kWh/m².yr|
|Primary Energy Demand||≤ 120 kWh/m².yr||≤ 120 kWh/m².yr *|
|Limiting Value||n50 ≤0.6-1||n50 ≤1.0-1|
Do you have plenums in your building? If the answer is yes, you need to be aware that a staggering 70% (approximately) fail their first air test. HRS have years of experience of raised access floor plenum air pressure testing and can work with you to ensure you pass first time – the key is to contact HRS early.
HRS can ensure that a site advice visit is arranged as soon as the floor is in place, we can then assess your design and offer you specification advice to ensure that your plenums are adequately sealed.
Any air handling ducts serving the test zone need to be turned off, isolated and temporarily sealed, stopping the passage of air to outside of the test zone via ductwork. Once the area has been prepared and the fan set up, the test takes place in the same way as a HRS normal air pressure test, i.e. taking a number of pressure readings over a period of about 30 to 45 minutes.
If your test fails, your HRS air tightness technician will carry out a smoke test to look for air leakage paths and sometimes it is possible to carry out remedial works.
HRS’s practical and technical expertise means we can identify defects/problem areas and carry out the necessary remedial works.
HRS can provide you with a complete range of building environmental and sustainability services, meaning you can save time and money, avoid inconvenience and your risks are minimised.
From concept design stage to completion, HRS can work alongside you every step of the way. You and your project would be supported by HRS’s extensive knowledge that has been built up over 30 years, whether you need consultancy or on site advice and guidance, HRS’s large team of consultants and on site technicians are here to support you to make sure that your project hands over on time and within budget.
At HRS we believe strongly in being pro-active and customer focused, providing you with innovative cost-effective solutions.
All you need to do is make one phone call to 0800 030 4391 or email: firstname.lastname@example.org sending one set of drawings stating what services you require, and HRS will take it from there.
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“Just wanted to drop an email show appreciation for HRS operatives for the works that they carried out. They very knowledgeable and were able to guide and work with our site team, in order to achieve satisfactory air tests.”
“Please pass on my thanks to the air tester for there positive approach and his hands on attitude. Can you please also pass this on to his line manager in his professional attitude. I look forward to being able to use HRS again in the future.”
“I would like to thank your air tester for his patience during the past tests. He has given me excellent advise which we help on future projects.”