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Topic: Cobbles with 10mm romex gap., Best bedding options< Next Oldest | Next Newest >


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Joined: April 2019
Posted: 23 April 2019,17:01 QUOTE

Hi, I've layed hard-core then sharp sand and was wondering if I can lay the cobbles on to that or whether it needs a cement screed. The cobbles are going to have a 10mm gap between with Romex D1 added.

Many thanks

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Tony McC

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Joined: July 2004
Posted: 24 April 2019,10:15 QUOTE

Are these really "cobbles" or are they actually setts?

Setts and Cobbles Definitions

Some setts *can* be laid onto sand, but then they would be jointed with a loose-fill aggregate, such as kiln dried sand or splitt. Cobbles are never (nowadays, at least) laid onto sand.

When a rigid/bound jointing medium is being used, whether it's cementitious or resin-based, the bed needs to be bound, so that usually means some form of mortar or concrete. Using a rigid or bound jointing system over a flexible/unbound bed is just asking for a failure.

Edited by Tony McC on 24 April 2019,10:16

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