H+H aircrete combines strength, thermal efficiency, fire resistance and acoustic performance in one proven building material.
In 2023, we took samples from our Pollington plant — built over 45 years ago using H+H aircrete blocks.
Blocks were taken from a wall that had been left exposed to the elements for many years (not a recommended practice, but an interesting trial).
A block was also soaked in water for 24 hours before testing — to assess performance under extreme moisture.
Every single block easily passed the compressive strength and structural performance tests — whether from the original factory walls, from exposed outdoor conditions, or after being water-soaked. Most strikingly, the 45-year-old block was considerably stronger than when first manufactured — proving that neither age nor harsh treatment diminishes the performance of H+H aircrete.
Reliable sound transmission control between adjacent spaces
Acoustic separation within dwellings
Compliance for multi-occupancy residential
Internal floor systems with acoustic performance
For houses, flats, and apartments, Celcon Blocks used as part of Robust Details® pre-approved acoustic designs can remove the need for pre-completion sound testing (PCT) — provided the build follows Robust Details specifications precisely.
E-WM 6 · E-WM 10 · E-WM 13 · E-WM 15 · E-WM 23 · E-WM 24
E-FC 4 · E-FC 5 · E-FC 8 · E-FC 9
Approved Document E still applies, but Robust Details are not recognised for hotels or similar accommodation. Pre-completion acoustic testing is required to demonstrate compliance.
H+H aircrete supports designs meeting Building Bulletin 93 Performance Standards. Due to the complexity of educational buildings, early collaboration with an acoustic consultant is recommended.
Excess daytime heat is absorbed during the day and released overnight — helping to mitigate overheating
Heat absorbed during the day is released gradually, reducing heating demand
Celcon Blocks have been successfully used in Passivhaus, zero carbon, and other ultra-low energy building standards — proving their capability to meet the most demanding thermal performance requirements.
Reduce heat loss at ground floor level — a key thermal bridge in modern construction
Mortar joints reduced from 10 mm to 2 mm — for airtight construction with minimal thermal bridging
Deliver thermally efficient additional living spaces, maintaining the performance standards of the original building
