Clash

Design Framework for Building Services 5th Edition (BG 6/2018), written by David Churcher, John Sands & Martin Ronceray, and published by BSRIA in June 2018 defines a clash as: ‘Two distinct elements occupying the same space. Space for access, installation and maintenance must be allowed for.’

It identifies three types of acceptable clash:

• Critical: Major clash - must be resolved at this stage.
• Moderate: Easily resolvable – does not have a major impact on ongoing design. Can be resolved at a future stage.
• Allowable: Acceptable clash – resolution not required in the design model.

--BSRIA

See also: Clash avoidance.

[edit] Related articles on Designing Buildings Wiki

• BIM.
• BSRIA articles on Designing Buildings Wiki.
• BSRIA definitions.
• BSRIA.
• Clash avoidance.