![]() ![]() Single coat proprietary renders on standard texture blocks should require no pre-treatment. Traditional renders and 2 coat polymer modified proprietary on standard texture blocks should require no pre-treatment. Standard texture dense, lightweight aggregate and ultra lightweight aggregate blocks all have these characteristics. Block types and surface texturesįor the purpose of this guidance note aggregate concrete blocks can be considered as falling into the following categories: Block Typeįor traditional and 2 coat polymer modified proprietary renders the ideal rendering background has moderate suction and a good mechanical key. This guidance note gives application guidance for the successful use of renders on aggregate blocks. The C& CA guidance did not cover the proprietary 1 and 2 coat renders which have been gaining in popularity and which can have different characteristics to traditional renders and therefore may need different guidance for their application although these were mentioned in the Concrete Society’s guide. ![]() Problems with renders on aggregate blocks are extremely rare as they have all the characteristics needed for the easy application of a durable render.Ĭomprehensive guidance on external rendering was first published by the Cement and Concrete Association (C & CA) in 1948 and this guidance which went through several editions, has proved to be both reliable and authoritative leading to an updated version published by the Concrete Society as Good Concrete Guide No 3. with a paint quality finish) also afford an excellent mechanical key. Aggregate blocks provide a moderately strong to strong background with moderate suction and unless the blocks used were intended for direct decoration rather than a rendered finish (i.e. ![]() Renders have been applied very successfully to aggregate concrete block backgrounds for decades. ![]()
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