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Types Of Materials Used In Crazy Paving

Types Of Materials Used In Crazy Paving

Posted: Jul 11, 2016

Types Of Materials Used In Crazy Paving

The term known as Crazy Paving is used to refer to a “crazed” appearance of outdoor or indoor flooring once the surface is finished. However, some people believe that this form of paving is easy or cheap and in many cases undertaken as a simplified alternative when it comes to traditional paving. Yet from the perspective of builders and contractors, this form of paving actually costs more due to the labor requirements that is needed to lay crazy paving compared to normal paving.

When “Crazy Paving” has been laid well, the jointing or mortar is less visible once the surface is finished. Mortar is known as the “structural” weak point when it comes to pavements. This means the less mortar the increase in the finished work being able to survive the 1st winter. Often this type of paving is laid badly, with too much mortar between the stone pieces and the entire surface will usually fail within a few short years.

Material Types

The majority of crazy paving is typically laid with the use of concrete paving or stone which will be non-rectangular in shape. These shapes are usually due to that the material chosen has naturally irregular shapes like slate or paving stones, or the material is broken up such as the concrete flags. In the majority of cases, this paving is laid best on what is known as a “cementitious” bed. This method ensures that the irregular-shaped and smaller pieces are firmly held in place so that they do not become loose.

It is suggested that when laying this paving to lay around 50mm of a 10:1 grit sand (semi-dry) and cement and to follow with a grout that is wet to seal the finished surface.

If the paving is intended for use to handle the weight of vehicles such as a forecourt or driveway, the paving would need to laid on a 100mm bed of the C20 concrete and movement joints will need to be installed in the exact same way as the normal types of concrete slabs. However, if the paving is intended for lightweight applications such as an outdoor verandah or patio, the 50mm thickness with the 10:1 bedding mix will be sufficient. Any make-ups in the levels needed between the bedding-layer and the prepared sub-grade can be conducted with a sub-base material or more of the bedding material.

The Laying Methods

When it comes to slate and stone, there are typically variations when it comes to the thickness of each piece. This adds in more challenges when it comes to the laying technique, which means that each piece will need to be bedded individually. The concrete flags that have a regular and consistent thickness can typically be laid on screeded beds in order to aid in accuracy and speed up the laying-process. The paving material chosen must be sorted, by choosing the most appropriate or best pieces first and then laying each piece separately. These pieces should be positioned closely to the surrounding pieces as possible in order to keep the mortar amount to the lowest possible.

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