External Tolerances

– There should  be a 10mm maximum deviation in any length of wall up to 5m.

– For walls over 5m long there should only be a 15mm deviation.

– Bed joint thickness should not vary from the average of 8 joints by 5mm.

– Perpend joints shouldn’t deviate drastically.

– Maximum  deviation of 20mm in an overall  height of a wall

– Maximum deviation in a 2.5m storey is 50mm

– Maximum deviation is 10mm in any 2.5m high wall.

Render Tolerances

Traditional cement render is quite popular, with polymer acrylic and monocouche renders used frequently also. Applying this cement to the front of your house gives it a certain aesthetic look and helps protect against water ingress. The integrity of the render is therefore very important to consider and application has to be done correctly for durability. For render less than 13mm thick a no tolerance limit is realistic. Where render has been applied it should be completely flat and always ask for the thickness. Significant cracks in the render or other damage such as chips, marks or cracks more than 15mm in diameter are considered unacceptable. When inspecting render it is important to consider climbing plants, leaking gutters and date and method of application.


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