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

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Cutting blocks Cavity insulation Scaffolding systems Generally it is not possible to use a conventional putlog tied scaffold where the inner leaf blockwork is built ahead of the outer leaf. The most versatile and cost effective solution is to use a proprietary system scaffold to build an ‘independent’ scaffold. Systems such as Kwikstage or Cuplok are readily available throughout the UK. It is also advisable to make sure that the setting out of the scaffolding takes into account the outer leaf being built at a later date. There are a number of ways that Celcon blocks can be cut. The traditional method is to use a hand saw. However, depending on the size of the project, builders have found it more efficient to use mechanical tools such as electric hand saws, circular saws and band saws, particularly when cutting the larger blocks. To maximise the productivity advantage of the Celcon Thin-Joint System the inner leaf can be built first. In addition to achieving an immediate weathertight structure, this also allows for easy inspection of the cavity side of the blockwork and permits the use of partial fill or full fill insulation. Since the inner leaf blockwork is free of wall ties and mortar snots, insulation boards can be placed up against the blockwork with helical type wall ties driven through the insulation into the blockwork behind. Because the insulation boards are fixed by mechanical ties, they cannot become loose during construction. Thus the risk of rain penetration is significantly reduced. Design Guidelines 4 13
4 Design Guidelines 14 Wall junctions Walls should normally be bonded in at returns and junctions unless a movement joint is required. Where a section of wall has to be constructed after other work, bonding can be replaced by a straight joint, providing proprietary flat strip shear ties are built in across the joint (as shown) or helical ties driven in during construction. This method of jointing is preferable to bonding under circumstances where differential movement is likely to occur (e.g. where sections of wall are built off different foundations). Where an inner leaf is built prior to the outer leaf, helical ties can be driven through the inner leaf into the internal partition (penetration into the partition should be a minimum of 50mm). These ties can be positioned irrespective of coursing. Where enhanced sound insulation is required, an acoustic sealant can be applied to each side of the vertical straight joint. 3M 3 Movement joints As for all masonry walls, the accommodation of movement should be considered at the design stage. The following general recommendations apply to aircrete: - Walls in excess of 6m long should be designed as a series of panels separated by movement joints at not more than 6m centres - The position of the first joint from the corner should be designed to be within 3m of a corner or fixed end - An alternative to movement joints is the use of bed-joint reinforcement, where entire wall panels are reinforced. This alternative is recommended particularly for an externally rendered solid wall construction or an outer leaf of rendered blockwork. This also applies to separating walls which should not contain movement joints 6M
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
Page 11 and 12: 8 Provided the initial stages are f
Page 13: Sound insulation Thermal insulation
Page 17 and 18: 4 Design Guidelines 16 Lintels Wall
Page 19 and 20: 6 Frequently Asked Questions 20 Wha
Page 21: ® H+H Celcon Limited Celcon House,

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

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