H+H UK LTD

CELCON HOUSE
IGHTHAM
SEVENOAKS
KENT TN15 9HZ

Tel: 01732 886444
Fax: 01732 887013

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Suppliers of: Celcon concrete blocks lightweight concrete blocks concrete thin joint system

H+H UK LTD manufacture a wide range of Concrete Blocks and lightweight Concrete Blocks to suite all types on Block Construction.

Useful Resources:

  • BIM files available on BPi
  • H+H Academy: Online training and resources Click here

H+H is the UK’s largest manufacturer of aircrete products. We manufacture the market leading range of Celcon Blocks, including Foundation Blocks, Plus Blocks and the H+H range of aircrete products.

H+H aircrete products offer a complete building material that meets the requirements of the Building Regulations, with the flexibility to offer solutions to hospitals, schools, offices, industrial warehouses and housing (social and private).

Used in partition, separating and external walls (solid or cavity), firewalls and as an infill to framed construction, our products provide durability and fire resistance as well as superb thermal and sound insulation.

Main Product Ranges:

Celcon Blocks

Celcon Blocks in Solar, Standard, High Strength and Super Strength Grades are the most commonly used aircrete block in the H+H range. All Celcon Blocks are BBA certified, are fire resistant (100mm walls, up to 4 hours, 2 hours if loadbearing) and have been classified 0 surface spread of flame and non-combustible to Class A1 (the highest class).

Celcon Block Solar Grade

Celcon Blocks Solar Grade is principally used where enhanced thermal performance is required. With superior thermal conductivity Solar Grade Celcon Blocks are suitably loadbearing for two storey buildings and can be used below DPC.

Celcon Block Standard Grade

Celcon Blocks Standard Grade is BBA certified and has a compressive strength of 3.6N/mm2. Due to its all round performance, it is possible for a 100mm Standard grade Celcon Block to be used throughout a build, eliminating on-site confusion.

Celcon Block High Strength & Super Strength Grade

H+H’s Celcon Blocks High Strength Grade (7.3N/mm2) and Super Strength Grade (8.7N/mm2) are used principally where higher compressive strengths are required such as in the foundations and lower storeys of three storey buildings, piers under high vertical loads and in multi-storey buildings.

Celcon Plus Blocks

Celcon Plus Blocks are an alternative to the 440 x 215mm face format block and are suitable for the same applications.  They are longer at 630mm long and come in a variety of thicknesses.

Celcon Foundation Blocks

Available in Standard Grade (3.6N/mm²) and High Strength Grade (7.3N/mm²), Foundation Blocks can be used to support 3 storey constructions.  They are suitable for the support of solid or cavity walls, framed construction or suspended floors, including beam and block.

Jumbo Bloks

Jumbo Bloks are produced with the latest technology, offering a high degree of dimensional accuracy with sharp arises, which make them ideal for use with Celfix mortar.

Celcon Block Coursing Units

Coursing Units are produced from the same material as all H+H aircrete and are suitable for the same applications as conventional size Celcon Blocks, allowing consistency within the building fabric.

Celfix Mortar

Celfix Mortar is cement based and supplied as a dry, pre-mixed powder in 25kg bags. It has been designed to replace the traditional sand:cement mortar and is used with building with our Thin-Joint System. Celfix Mortar starts to set within 10 minutes of application and approaches full design strength in just 1 to 2 hours.

BLOCKS AGREMENT CERTIFICATE HOLDERS BS EN 771
BLOCKS Aircrete .See Also BLOCKS: Lightweight Aerated Concrete:
BLOCKS Approved Document L / Part L
BLOCKS BRE BES 6001 Responsible Sourcing (RSM) Rating Excellent
BLOCKS BS 14001
BLOCKS BS 5051 Class G2 (Ballistics)
BLOCKS BS 5628:Part 1 Special Category
BLOCKS BS EN 1996-1,2,3
BLOCKS BS EN 771
BLOCKS Cellular Concrete AGREMENT CERTIFICATE HOLDERS
BLOCKS Cellular Concrete BS 5628 Part 1
BLOCKS Concrete
BLOCKS Concrete Beam and Block Flooring Infill
BLOCKS Concrete BS 5628 Part 1
BLOCKS Concrete by Sizes (Metric) Actual: 215mm x 65mm
BLOCKS Concrete by Sizes (Metric) Actual: 300mm x 215mm
BLOCKS Concrete by Sizes (Metric) Actual: 325mm x 215mm
BLOCKS Concrete by Sizes (Metric) Actual: 440mm x 215mm
BLOCKS Concrete by Sizes (Metric) Actual: 630mm x 140mm
BLOCKS Concrete by Sizes (Metric) Actual: 630mm x 215mm
BLOCKS Concrete by Sizes (Metric) Actual: 630mm x 250mm
BLOCKS Concrete by Sizes (Metric) Actual: 630mm x 350mm
BLOCKS Concrete by Thickness (Metric): 75mm
BLOCKS Concrete by Thickness (Metric): 100mm
BLOCKS Concrete by Thickness (Metric): 140mm
BLOCKS Concrete by Thickness (Metric): 150mm
BLOCKS Concrete by Thickness (Metric): 200mm
BLOCKS Concrete by Thickness (Metric): 215mm
BLOCKS Concrete by Thickness (Metric): 255mm
BLOCKS Concrete by Thickness (Metric): 275mm
BLOCKS Concrete by Thickness (Metric): 300mm
BLOCKS Concrete by Thickness (Metric): 325mm
BLOCKS Concrete by Thickness (Metric): 355mm
BLOCKS Concrete Fire Resistant BS 476
BLOCKS Concrete Fire Resistant BS 476 1 Hour
BLOCKS Concrete Fire Resistant BS 476 2 Hour
BLOCKS Concrete Fire Resistant BS 476 4 Hour
BLOCKS Concrete Fire Resistant BS 476 6 Hour
BLOCKS Concrete Fire Resistant BS 5628 1 Hour Loadbearing
BLOCKS Concrete Fire Resistant BS 5628 2 Hour Loadbearing
BLOCKS Concrete Fire Resistant BS 5628 4 Hour Loadbearing
BLOCKS Concrete Fire Resistant BS 5628 6 Hour Loadbearing
BLOCKS Concrete Fire Resistant BS 5628 Class 1
BLOCKS Concrete Fire Resistant BS EN 13501 Class A1
BLOCKS Concrete Fire Resistant ENV1996-1-2-:1995
BLOCKS Concrete Non-Combustible
BLOCKS Concrete Party Walls
BLOCKS Concrete Party Walls Sound Insulation
BLOCKS Concrete Thin Layer Joint Systems AGREMENT CERTIFICATE HOLDERS
BLOCKS Concrete Thin Layer Joint Systems Masonry
BLOCKS Coursing
BLOCKS Coursing Brick Format Units
BLOCKS Featherweight BS EN 771-4
BLOCKS Flooring
BLOCKS Foundation
BLOCKS Foundation AGREMENT CERTIFICATE HOLDERS
BLOCKS Foundation Lightweight Aerated Concrete
BLOCKS Frost Resistant
BLOCKS High Strength
BLOCKS Lightweight Aerated Concrete
BLOCKS Lightweight Aerated Concrete Acoustic Performance Robust Detail
BLOCKS Lightweight Aerated Concrete AGREMENT CERTIFICATE HOLDERS
BLOCKS Lightweight Aerated Concrete Approved Document E
BLOCKS Lightweight Aerated Concrete Beam and Block Flooring Infill
BLOCKS Lightweight Aerated Concrete Below DPC
BLOCKS Lightweight Aerated Concrete BRE Green Guide A+ Rating
BLOCKS Lightweight Aerated Concrete Brick Coursing Size
BLOCKS Lightweight Aerated Concrete BS EN 771-4 (BS 6073)
BLOCKS Lightweight Aerated Concrete BS EN 771-4 CE Marked
BLOCKS Lightweight Aerated Concrete Cavity Wall
BLOCKS Lightweight Aerated Concrete Fire Resistant Class A1
BLOCKS Lightweight Aerated Concrete High Strength
BLOCKS Lightweight Aerated Concrete Infill
BLOCKS Lightweight Aerated Concrete Inner Leaf
BLOCKS Lightweight Aerated Concrete Insulating
BLOCKS Lightweight Aerated Concrete Internal Facing
BLOCKS Lightweight Aerated Concrete Large Format
BLOCKS Lightweight Aerated Concrete Partition
BLOCKS Lightweight Aerated Concrete Solar Grade
BLOCKS Lightweight Aerated Concrete Thin Joint Systems / AGREMENT CERTIFICATE HOLDERS
BLOCKS Lightweight Aerated Concrete Thin Joint Systems / Thin Layer Joint Masonry
BLOCKS Lightweight Aerated Concrete Thin Layer Joint Masonry
BLOCKS Lightweight Concrete:
BLOCKS Lightweight Concrete: BS 5628
BLOCKS Lightweight Concrete: BS EN 771-4
BLOCKS Plain Finish
BLOCKS Sound Insulation
BLOCKS Sulfate Resistance Sulfate Classes up to Class 4
BLOCKS Thermal Insulation
BLOCKS Thermal Insulation AGREMENT CERTIFICATE HOLDERS
BLOCKS Thermal Insulation Anti-Cold Bridging
BLOCKS Thermal Insulation Below DPC
BLOCKS Thermal Insulation Lightweight High Strength
BLOCKS Thermal Insulation NHBC Requirements
BLOCKS Thermal Insulation Specialist Application Higher Thermal Conductivity
BLOCKS Thermal Insulation Thermal Bridging Solutions
BLOCKS by Strength K values (3pc Moisture Content) 2.8 N per Square mm less than 0.15 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 3.5 N per Square mm less than 0.15 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 3.5 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 4.0 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 7.0 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 8.7 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 10.0 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BRICKS Concrete Coursing
CAVITY WALLS Aerated Concrete Panels Modular Construction Elements
CAVITY WALLS Aerated Concrete Panels Storey Height Panels
CAVITY WALLS External Concrete
COURSING BRICKS Concrete
COURSING BRICKS Concrete Coursing Solid Units
FOUNDATION Design
HOUSE BUILDING SYSTEMS OSM (Offsite Manufacture)
HOUSE BUILDING SYSTEMS OSM (Offsite Manufacture) Complete Whole House Shells
INSULATION BLOCKS .See Also BLOCKS: Thermal Insulation:
MORTARS Blockwork Thin Joint
MORTARS Blockwork Thin Joint BS EN 998-2
PARTITION WALLING AGREMENT CERTIFICATE HOLDERS
PARTITION WALLING Concrete Building Regs Part E
PARTITION WALLING Concrete Units Lightweight Aerated Concrete
PARTITION WALLING Concrete Units Lightweight Aerated Concrete Modular Elements
PARTITION WALLING Concrete Units Lightweight Aerated Concrete Storey Height Panels
SOLID WALL CONSTRUCTION Concrete Blocks
UNITS Precast Concrete Coursing
WALL SYSTEMS OSM (Offsite Manufacture)
WALL SYSTEMS Prefabricated Elements
WALL SYSTEMS Prefabricated Elements Modular Aerated Concrete Panels
WALL SYSTEMS Prefabricated Elements Modular Aerated Concrete Panels Storey Height
WALLS Flanking Concrete
WALLS Flanking Concrete Aerated Concrete Panels Modular Elements
WALLS Flanking Concrete Aerated Concrete Panels Storey Height
WALLS Separating Concrete
WALLS Separating Concrete Aerated Concrete Panels Modular Elements
WALLS Separating Concrete Aerated Concrete Panels Storey Height
AIRCRETE BLOCKS Concrete Blocks
CELCON Blocks
CELCON ELEMENTS Precast Concrete Modular Construction Elements
CELCON FLOORBLOCK Infill Blocks
CELCON FOUNDATION Blocks
CELCON PLUS Blocks
CELCON SOLAR Blocks
CELCON STANDARD Blocks
CELFIX Mortar
HIGH-STRENGTH (replaces HI-SEVEN) Concrete Blocks
JUMBO BLOKS Large Aerated Concrete Blocks
MULTI PLATES Large Aerated Concrete Blocks
RA BUILD All In One Building Concept
RÅ HOUSE All In One Building Concept
SIG I-HOUSE OSM Off-Site Manufacture House Building System
SOLAR GRADE Blocks
SUPER-STRENGTH (replaces HI-TEN) Concrete Blocks
THIN-JOINT SYSTEM Block Walling System
VERTICAL ELEMENTS Building Panels

Recarbonation in aircrete: offsetting emissions for a carbon neutral future

June 2024

H+H aircrete is made from cement, lime, sand, water, pulverised fuel ash (PFA), and a dash of aluminium powder. Most of the carbon emissions associated with aircrete come from the manufacturing process of the cement and lime.

The primary raw material used in cement production is limestone. When limestone is heated in a kiln at a very high temperature it undergoes a chemical reaction (calcination). During calcination, limestone decomposes to form lime (calcium oxide) and CO₂ gas. The calcination step is where the majority of the CO₂ emissions in cement production occur.

However, limestone-based materials such as aircrete also absorb CO₂ during their lifetime. This is due to a chemical reaction which occurs when carbon dioxide from the air reacts with calcium hydroxide in aircrete to form calcium carbonate, sequestering the CO₂ in the process. This is called recarbonation.

It's due to this process that aircrete acts as a permanent carbon sink, absorbing carbon from the atmosphere over the course of its lifetime. As with conventional concrete, this process does not reduce the strength of aircrete. Recarbonation occurs not only when a house built with aircrete is inhabited, but also after it is demolished and the building materials used are recycled.

Recarbonation helps to offset the carbon emitted during the manufacturing process and has the potential to make aircrete carbon negative. Experts from the European Autoclaved Aerated Concrete Association (EAACA) have calculated that the recarbonation associated with aircrete could account for a 43% reduction of total CO₂e per m³ by 2050.

How does H+H aircrete maximise recarbonation potential?

According to current building standards, homes built in the UK today are expected to have a lifespan of 60 years. Homes built with H+H aircrete can last for over 100 years.

This longevity allows more time for recarbonation, which reaches around 80% after 50 years and 95% by 80 years. Aircrete can absorb 77 kg CO₂ per m³ if complete recarbonation is achieved.

How is H+H lowering manufacturing emissions?

While recarbonation can offset some of the carbon created during production, we are still actively working to reduce the CO₂ emissions released during the manufacturing process.

At least 85% of our carbon emissions are Scope 3. We are working with our suppliers who have robust plans in place to reduce their own emissions through innovative carbon reduction schemes.

Our lime supplier, Singleton Birch, is aiming to reach net negative CO₂ emissions by 2040 and is taking innovative steps such as building a zero-carbon enabled pilot lime kiln.

Our cement supplier, CEMEX UK, also has a roadmap to reduce its emissions. The company already uses 100% renewable energy sources for its electricity consumption, and 72% alternate fuels in its production of cement.

H+H is committed to achieving net-zero emissions in our operations and products by 2050.

See our UK sustainability roadmap for further details on how we are working towards reducing our emissions.

Dorset housebuilder employs Vertical Wall Panels for fast build

May 2024

Karm Homes, a regional housebuilder specialising in affordable housing in Dorset and Hampshire, is currently developing two chalet bungalows in Charlton Marshall, near Blandford Forum. These rural three-bedroom homes will benefit from picturesque views of the surrounding countryside and are due to be finished by early summer.

Karm Homes has chosen to build these homes using the i-House system to speed up the build programme without compromising on quality. This Modern Method of Construction (MMC) was designed by H+H in collaboration with Roofspace Solutions to meet the increasing demand for speed of delivery within the housebuilding industry.

The i-House system combines H+H Vertical Wall Panels (VWPs) with prefabricated floors and roofs, offering the complete watertight shell of a standard house design in just one week.

Vertical Wall Panels are storey-high panels of aircrete that are fabricated offsite and craned onto standard foundations. They are secured with fast-setting strong mortar, creating a 2mm airtight joint for a high-quality, time-efficient build with little site wastage.

The panels offer all the benefits of aircrete which is highly thermally efficient: Vertical Wall Panels achieve a U-value of 0.17 W/m²K, meeting Passivhaus standards. Aircrete is also fire, moisture, and mould resistant and has a lifespan of over a hundred years, enabling the construction of durable, comfortable homes.

Martin Keenes, Director of Karm Homes, is an advocate of the i-House solution, and feels the system is ideal for smaller housebuilders developing niche sites. He likes the convenience of working with one company that sources all the materials for the building envelope and assembles it on site. He also appreciates having complete design flexibility and where possible designs the floorplate of each home around the 600mm width of the Vertical Wall Panels to reduce cuts, wastage, and time.

Martin comments: “We have looked at other MMC systems, such as SIPs, but found them to be more expensive than the i-House masonry solution plus increased fire risk and insurance premiums associated with a timber build. We also prefer building with masonry as our customers expect the durability that comes with a masonry home.”

Karm Homes has not been afraid to seek out innovative housebuilding solutions and Martin finds it surprising that the H+H Vertical Wall Panels are not more widely used, commenting:

“We use local architects to design our houses. When we suggest H+H Vertical Wall Panels to them, they’re sometimes unaware of the option. However, once they’ve seen the system in action, they’re completely converted. We can’t understand why more companies are not using this solution.”

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