Inspection Chambers

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Frequently Asked Questions

Where should I install a drainage inspection chamber?

An inspection chamber is generally needed in the following scenarios:

  • When pipework changes direction with an angle of more than 30dg - bends in pipe runs increase the probability of clogging
  • If the pipe size changes or the smaller branch pipe meets the main drainage pipe - this area is susceptible to blockages
  • When two pipes meet at a junction at more than a 45 degree angle All the drainage inspection chambers we stock meet the necessary industry and regulatory specifications for maintaining and clearing your drain pipes.

    Are inspection chambers the same as manholes?

    Although the term ’inspection chamber’ is often used interchangeably with ‘manhole’, there are differences between the two.

    Manholes are much larger in size, allowing engineers to enter the pipe system. It’s unusual to have a manhole installed on domestic properties because they’re usually positioned along the main water company pipe line.

    Inspection chambers are much smaller and installed as access points for equipment, such as cameras or drain rods. An inspection chamber is used to identify and clear blockages in the pipes running from your house towards the main sewer line.

    We have a collection of premium quality inspection chambers available to order online. Our chambers are stocked in multiple sizes and can be purchased individually or as a complete set with cover included.

    How deep can a drainage inspection chamber be installed?

    This depends entirely on the diameter of your inspection chamber and the restricted access cover it has.

    Smaller access chambers set-up close to houses are typically 300mm in diameter. These inspection chambers can be fit to a maximum depth of 600mm.

    The most common inspection chamber diameter is 450mm and can be fitted at any depth up to 3000mm. A chamber installed at this depth must be sealed with a restricted access cover to prevent unwanted access and accidents from occurring.

    For more information regarding drainage inspection chambers, get in touch with our team of experts via our online enquiry form, and we’ll be in touch as soon as possible.

    Are there any legal requirements to consider when installing inspection chambers?

    There are a few legal requirements outlined by the Ministry of Housing that you should familiarise yourself with when it comes to water drainage and waste disposal.

    They include regulations prohibiting buildings being constructed over drainage inspection chambers. Inspection chambers must also be manually accessible. Failing to adhere to these government regulations may result in fines or claims against you.

    Cotterill Civils stock a range of quality inspection chambers that are durable and non-corrosive. All the products we supply are guaranteed to meet the needs of your underground drainage system. Feel free to give us a call on 0121 351 3230 or get in touch online via our enquiry form.


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