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How do atmospheric environments impact anchor selection?

Stevan Grkinic
Stevan Grkinic

Technical Sales Manager

When selecting an anchor/fixing it is important to understand the type of atmospheric environment surrounding the anchor. Certain environments can impact the working life of an anchor/fixing over time. 

In our latest soundout episode our fixings/anchor expert Steve Grkinic discusses the role the environment plays when selecting an anchor/fixing.  

Quite often, anchors/fixings are considered at the last minute and are often not fit for purpose. As the updated building safety bill comes into play, it will become critical to consider anchor/fixing compliance.

When considering the environment we need to answer the following questions; 

  1. Will the anchor be installed internally? 
  2. Will the anchor be installed in humid conditions? 
  3. Will the anchor be installed outside/external?  
  4. Will the anchor be installed near the coast? 
  5. Are there any special conditions which need considering? 

Most internal applications will be zinc plated. For certain applications, for example, in a multi-story car park once we remove the walls the environment is altered. Certain applications such as swimming pools need very careful consideration as the chlorinated environment can induce stress corrosion cracking in some grades of stainless steel.

Corrosion categorisationDifferent types of environments and how the anchor/fixing selection is impacted by them.

The table below indicates the appropriate materials for these environments where the fixture is in all cases suited to the anchor.

 

The impact of environment on anchor selection
The impact of environment on anchor selection   

Most internal applications will be zinc plated. For certain applications, for example in a multi-story car park once we remove the walls the environment is altered.

Certain applications such as swimming pools need very careful consideration as the chlorinated environment can induce stress corrosion cracking in some grades of stainless steel.

 

Anchor selection corrosion

The table above illustrates the different corrosion categories and their impact on different environments as outlined in the ISO 9223 classifications.

*Please be aware in each of these cases we are presuming the application condition is normal before installation. 

Overall, the environment is a very important factor to consider when selecting an anchor. 

Further reading 

There are many resources around that can help to better understand anchor/fixing compliance.

The CFA (Construction Fixing Association) is a trusted body that provides useful guides around the BS 8539 to help inform the construction industry.  

If you are looking for further resources such as toolbox talks then head over to the Construction Fixing Association website (CFA)  

Start the conversation around anchor/fixing compliance

Call the sales team on 0115 922 1585 or email: sales@midfix.co.uk for specialist advice.

 

Topics: BS 8539, Compliance