Aerated Concrete Blocks Manufactured to BS EN 771-4 ISO 9001 Quality Assured ISO 14001 Environmentally Certified BBA Certified, Category I Manufactured Airtec blocks possess unrivalled technical properties and physical characteristics. They have the lowest available thermal conductivity values of any UK manufactured block and meet the tightest possible dimensional tolerance designation TLMB (Thin Layer Mortar B). All Airtec blocks are BBA certified, manufactured to Category I standard, ISO 9001 Quality assured and ISO 14001 Environmentally accredited. TECHNICAL PROPERTIES Airtec Standard Airtec Party Wall Airtec Seven Gross Dry Density, kg/m³ Mean Compressive Strength, N/mm² Thermal Conductivity Protected Inner Leaf W/mK Suitable for block & beam floor infill Large Format blocks available Solid Foundation blocks available Wall Blocks: 620mm x 215mm x (100, 115, 125, 140, 190, 215) Large Format Block 620mm x 430mm x 100mm 140 Foundation Blocks 620mm x 140mm x (275, 300, 350) 215 Foundation Blocks 620mm x 215mm x (260, 275, 300) Brickettes 215mm x 65mm x (100, 115, 125, 140) Some block sizes and strengths are made to order. Please check with our sales office on block availability as far in advance as possible before the blocks are required. PHYSICAL PROPERTIES (selected wall blocks; please refer to our online Airtec Brochure for full details) Block Type Walled Weight kg/m² See Note 1 Sound Reduction Block Weight Fire Resistance FOUNDATION BLOCKS m² per pack Airtec Party Wall Block Large Format 3.6N Block Foundation Block Size 1. Walled weight is for a single-leaf wall, plastered on both sides. 2. Sound Reduction Rw values are based on wall mass and assumes a plastered finish on both sides. 3. The block weights quoted above are approximate and include the typical additional weight from the natural moisture content of the block, although this can vary slightly. 4. Fire resistance periods to BS 5628-3 for a single-leaf, non-loadbearing plastered wall. 5. Based on the inclusion of conventional 10mm mortar joints except for the Airtec Large Format block. NBS Clauses for our concrete block products can be found on www.ribaproductselector.com

Aerated concrete blocks The table below shows examples of how cavity walls built with an Airtec XL 2.9N block inner leaf can meet a range of u-value targets. For specific calculations, please contact our technical department. Airtec block surfaces offer a good surface for accepting mortars. On dry blocks, rather than wetting the blocks we recommend adjusting the consistency of the mortar to suit the suction of the block. The weakest mortar mixture appropriate to the structural requirements should be selected as per BS 5628-3. A weaker mix should always be used with Airtec blocks. Partially Filled...