Anchor selection – BS 8539 Guidance
In our latest soundout Steve talks through the key questions that should be considered when selecting an anchor.
How do we select an anchor in accordance with BS 8539?
Well, it is a good question because selection particularly within M&E building services tends to be a bit of a problem, what usually happens is the actual selection process is left til the end and it is the installer that has the responsibility to select the anchor and what they tend to do is usually default to an anchor they usually use to do the install with.
What steps should we follow when selecting an anchor in relation to the BS 8539?
They has got to be due diligence when it comes to anchor selection, it is important we choose the correct anchor for the specific installation. We need to look at the following factors;
- Environment (internal/external)
- Type of installation (through fix or is it a flush fix)
- Working principles of the anchors
- Accreditation required
What type of substrate will the anchor be fixing onto?
What type of substrate are we fixing into, is it cracked concrete, non-cracked, is it hollow is it solid?
What do we need to know about an anchor load?
We need to look at the loads: that the anchor is going to be subjected to throughout its working life.
What type of environment surrounds the anchor?
We need to look at the environment it is working under, is it external or internal and is it under any special conditions such as swimming pools as this will often determine the specific finish of an anchor?
What type of installation is appropriate for a given substrate?
We need to understand; is it through fix or a flush fix.
Working principles of the anchor
The actual working principles of the anchor is an extremely important factor to consider when we are selecting an anchor. Certain anchors pose a large amount of stress on the substrate. For example a deformation controlled anchor commonly known as a ‘drop-in anchor’ you would not use on brickwork as it would damage the brick. We need to look at an anchor that is kinder to the substrate. For concrete, a preferred anchor could be a concrete screw or a resin anchor.
What type of accreditation is required?
And the final bit we need to look at is the accreditation required for that install, so what do we need? ETAs, RAS approvals? It all depends on the accreditation required.
To summarise, if we look at those 6 points it is not fair or correct to leave it to the last minute for the installer to make the final decision.
For complete guidance on the BS 8539 visit our comprehensive guide
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