RENDERS – a) ‘Monocouche’ and other proprietary systemsįrom our own involvement with several (e.g. Keeping the blocks dry will ensure minimal drying out movement. Where a non-lime mix is to be used the appropriate proportions by volume are given in Table 14 Site Practice: All blocks (as with other materials) should be protected. In external situations, lime based mortars can also give higher resistance to rain penetration (clause 5.5.4.2.2). Generally, lime based mixes are preferable as these give a better bond than can be obtained with air-entrained mortars of similar compressive strength. Recommended mixes are given in the Celcon Book of Blocks. Mortar: For ‘traditional’ (10mm thick) joints overstrong mortars should be avoided. See the Celcon Book of Blocks (at the UK ) for general advice on Accommodation of Movement. Specific recommendations will depend on the circumstances, and each situation should be assessed on its own merits. For an outer leaf or solid wall of rendered blockwork bed joint reinforcement should be provided at openings (clause 5.4.5 and Figure 4 and the need for any movement joints considered at the design stage. Work should comply with the relevant Codes,, and the following is a summary of their principal recommendations.īLOCKWORK – for all types of rendering Movement Joints: Clause 5.4.2 advises that for all masonry work, movement joints may need to be provided. The choice of block type and render specification should reflect the exposure conditions and whether the cavity contains insulant or not (see TSD/45, page 3 of this data sheet). Externally rendered Celcon blockwork as an outer leaf of a cavity wall - or as a solid wall where exposure conditions allow - are recommended constructions.
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