For High‑Capacity Air Tightness Testing for Buildings Over 10,000 m² – APT Sound Testing Leads the Way
In today’s construction landscape, airtightness is a critical performance requirement. As buildings become larger and more complex, developers need a testing partner with the equipment, accreditation, and technical expertise to deliver accurate results at scale.
APT Sound Testing is one of the very few UK companies capable of undertaking air pressure testing on huge buildings above 10,000 m², thanks to our high‑power 6‑fan system and our Level 2 ATTMA and UKAS‑accredited status.
This article explains why our capability matters, how our technology works, and why contractors, developers, and design teams trust us for large‑scale airtightness testing and diagnostic surveys.
Industry‑Leading Large-Scale Blower Fan System for Very Large Buildings
Most testing companies operate with one or two fans — suitable for houses and small commercial units. But large buildings require far more power and airflow. APT Sound Testing now operates a high‑capacity multi-blower fan system, giving us the ability to test:
- Warehouses and logistics hubs
- Large retail units and supermarkets
- Schools, hospitals, and public buildings
- Multi‑storey developments
- Industrial and manufacturing facilities
- Buildings with complex internal zoning
Our system delivers:
- Stable test pressures across very large internal volumes
- Accurate readings even on buildings exceeding 10,000 m²
- Faster test times, reducing disruption to site programmes
- Full compliance with ATTMA TSL1 & TSL2 and Part L
This level of capacity is rare — most companies simply do not have the equipment to test buildings of this size. Our investment ensures clients can rely on a single, highly experienced provider for even the most demanding projects.
Level 2 ATTMA Registered & UKAS‑Accredited Testing Laboratory
Large‑scale airtightness testing requires more than powerful fans. It requires competence, accreditation, and proven technical quality and air tightness test procedures.
APT Sound Testing is:
- Level 2 ATTMA Registered – authorised to test large, complex, and multi‑zone buildings
- A UKAS‑Accredited Testing Laboratory – ensuring accuracy, traceability, and regulatory acceptance
This gives clients:
- Guaranteed compliance with Building Regulations Part L
- Confidence that results are independently verified
- Acceptance by Building Control, BREEAM assessors, and warranty providers
- Reduced risk of retesting or project delays
For large buildings, accreditation isn’t optional — it’s essential.
Advanced Air Leakage Diagnostic Surveys
Achieving airtightness on a large building can be challenging. Even small defects can cause major leakage when multiplied across thousands of square metres.
APT Sound Testing provides comprehensive air leakage diagnostic surveys using a combination of:
1. Smoke Testing
Under pressurised conditions, smoke reveals:
- Leaking cladding interfaces
- Poorly sealed service penetrations
- Defective door and window seals
- Roof‑to‑wall junction failures
- Hidden voids and construction gaps
Smoke testing provides instant visual confirmation of leakage paths.
2. Thermal Imaging
Thermal imaging identifies:
- Cold air infiltration
- Missing or poorly installed insulation
- Thermal bridging
- Hidden leakage not visible to the eye
When combined with depressurisation blower door testing, thermal imaging inspections becomes a powerful diagnostic tool.
3. Detailed Air Leakage Reports
We produce clear, contractor‑friendly reports including:
- Annotated photos and thermal images
- Leakage severity ratings
- Root‑cause analysis
- Recommended remedial actions
- Priority lists for sealing works
These reports allow site teams to carry out targeted remedial sealing quickly and efficiently.
Why Large Buildings Require Specialist Testing
Testing a building over 10,000 m² is not simply a scaled‑up version of testing a house. It requires:
- High‑capacity fans
- Advanced flow measurement
- Multi‑zone testing strategies
- Experienced engineers
- Robust diagnostic methods
- Accredited reporting
Without the right equipment and expertise, results can be inaccurate — leading to delays, retesting, and increased costs.
APT Sound Testing eliminates these risks by providing a complete, accredited, high‑capacity testing service.
Supporting Contractors, Developers & Design Teams
We understand the pressures of modern construction programmes. Our service is designed to support your project from start to finish:
- Design‑stage consultancy
- Pre‑test inspections
- High‑capacity large building testing
- Diagnostic surveys
- Targeted remedial guidance
- Fast turnaround reporting
Our goal is simple: help you achieve compliance first time.
Airtightness Testing for BREEAM & Energy Performance
For projects targeting BREEAM, low‑carbon performance, or enhanced energy efficiency, airtightness is a key factor.
Our services support:
- BREEAM Hea 02 & Ene 01 credits
- Improved EPC and SBEM outcomes
- Reduced heating and cooling loads
- Better long‑term building performance
Large buildings have large energy bills — airtightness is one of the most cost‑effective ways to reduce them.
Why Choose APT Sound Testing?
- High‑Power Blower Door Fan System for buildings above 10,000 m²
- Level 2 ATTMA Registered
- UKAS‑Accredited Laboratory
- Smoke & Thermal Imaging Diagnostics
- Detailed, actionable reporting
- Fast turnaround
- Nationwide coverage
APT Sound Testing is one of the UK’s leading providers of large‑scale airtightness testing — trusted by contractors, developers, and design teams nationwide.
Contact APT Sound Testing
For large‑scale air pressure testing, diagnostic surveys, or technical advice, contact us:
Phone: 07775 623464 Email: info@airpressuretesting.net Website: www.airpressuretesting.net