The Celcon Thin-Joint System A Definitive Guide - Masonry First

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4 Design Guidelines 10 FIRE RESISTANCE Structural design Fire resistance The Celcon Thin-Joint System should be used following the general recommendations of BS 8000 Part 3:2001 and BS 5628-3:2001 and BBA certificate 01/3816. In addition, Celcon’s ‘Book of Blocks’ contains advice on general site practice. The inherent properties of aircrete applies equally to thin-joint masonry. Walls constructed using the Celcon Thin-Joint System can be designed in accordance with the structural Eurocode for masonry ENV1996.1.1. Better values of masonry compressive strength are achieved with Celfix Mortar when compared to general purpose mortar. It is also possible to design to BS 5628-1:1992 assuming a characteristic compressive strength of Celcon thin-joint masonry based on Table 2 values given for designation (i) mortars. The characteristic flexural strengths of Celcon thin-joint walls can be taken to have the same values as those for designation (i) mortars in BS 5628-1:1992 Table 3. Celcon blocks have excellent resistance to fire. Extensive use has proved their capability in fire-break walls and as protective cladding for other forms of construction, for example steel frames. Celcon blocks are classified as non-combustible and have a class 0 surface spread of flame as described in the National Building Regulations. The figures given in the table below have been derived from Eurocode 6: Design of Masonry Structures:Part 1-2. General rules – Structural fire design (DD ENV 1996-1-2:1997) together with the UK National Application Document. If Celcon blocks are to be used in cavity wall constructions, either in new build or renovation work, the thickness shown below may be reduced; contact the Technical Services Department for further advice. Minimum block thickness excluding finishes(mm) Loadbearing wall Non-loadbearing wall up to up to Fire resistance (hours) 1 2 4 6 1 2 4 6 Solar range 100 130 200 - 75 100 140 - Standard & Hi-Strength ranges 90 100 190 215 75 75 100 150
Sound insulation Thermal insulation Sound insulation of any masonry construction depends on the density and porosity of the material used. The structure of aircrete, consisting of a vast number of tiny, noninterconnecting air cells, gives high resistance to airborne sound. This considerably improves on the normally accepted mass law relationship applied to other types of masonry materials. Celcon’s products have excellent sound insulation qualities, which can easily achieve the requirements for internal and separating (party) walls and floors as well as flanking elements of the new Part E of the Building Regulations. The use of Celfix Mortar provides the added benefits of further improvements in sound insulation as well as faster speed of build. For further information regarding sound insulation please contact our Marketing department and request a copy of our Celcon Solutions to Part E brochure. An example of a separating (Party) wall solution is shown above. Given the excellent thermal properties inherent with Celcon aircrete blocks, the Celcon Thin-Joint System can offer enhanced benefits. Approved Document ‘L1 & 2’ of the Building Regulations requires that heat loss through mortar joints be taken into consideration when calculating U-values for walls. The use of Celcon thin-joint blockwork minimises these effects by reducing the relative area of mortar per m2 of wall. The actual performance of the wall, with regard to heat loss, will actually be better than similar walls built using traditional mortar with normal format blocks. For example in a solid wall solution an improvement of up to 20% in U-value can be achieved. Design Guidelines Comparison of AAC mass law with established formula for a range of materials NPL = National Physical Laboratory Average Sound Reduction Index R, dB 50 100 200 300 500 70 60 50 40 30 50 100 200 300 500 Superficial Density, kg/m 2 Masonry outer leaf Cavity closer Minimum 75mm clear cavity Minimum Celcon 100mm Standard or Hi-Strength Plaster or Plasterboard on dabs Aircrete Mass Law R=22.9 log(m)-4.2 NPL Mass Law R=14.5 log(m)+10 70 60 50 40 30 4 11
Page 1 and 2: ® The Celcon Thin-Joint System A D
Page 3 and 4: Aircrete combines superb thermal an
Page 5 and 6: Flexibility As with traditional bui
Page 7 and 8: Solid external walls Solid wall con
Page 9 and 10: ...and tools As with any new buildi
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Page 15 and 16: 4 Design Guidelines 14 Wall junctio
Page 17 and 18: 4 Design Guidelines 16 Lintels Wall
Page 19 and 20: 6 Frequently Asked Questions 20 Wha
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The Celcon Thin-Joint System A Definitive Guide - Masonry First

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