At Drainage Sales we receive more questions about manhole covers than on any other subject, so we have produced an infographic fact sheet packed with do's and dont's and questions and answers - click here to take a look.
Historically, manhole covers were square or rectangular castings that had to be surrounded with a bed of concrete or tarmac, limiting the amount of choice for new installations. These days there is a wide range available, including covers that can be fitted discreetly into block paving or patios, or even inside the house! Circular manhole covers are also now commonplace, brought about by the introduction of circular plastic inspection chambers.
In terms of materials, you can choose from galvanised steel, ductile iron or polypropylene. Steel and polypropylene are the lightest materials and are very strong and hardwearing. Cast or Ductile Iron look particularly good in period properties, or in tarmac drives. As always you should ensure that the loading capacity of the cover that you choose is fit for the location where it is to be installed.
Our covers are made by recognised market leaders such as ClarkDrain and Floplast.
If the manhole cover is in a garden or other pedestrian area, it only needs to be an A Class cover, rated to 2.5 tonnes. In a driveway we recommend B class, which is rated to 5 tonnes and will support a slow moving wheel load of 1.25 tonnes – perfect unless your everyday drive is a tank!
If you bring a van or small truck onto your drive we recommend a C class cover with a 10 Tonne load capacity. For more commercial applications, please refer to the table below.
|Load Rating||Wheel Load Supported||Recommended For|
|2.5 Tonne||N/A||Pedestrian Use Only|
|5 Tonne||1.25 Tonne||Domestic Driveways|
|10 Tonne||2.5 Tonne||Service Areas / Restricted Access|
|17 Tonne||4.25 Tonne||As above but will support small commercial vehicles|
|25 Tonne||6.25 Tonne||Pedestrian Precincts and Commercial Delivery areas|
|38 Tonne||9.5 Tonne||Petrol Forecourts - special order, please contact us|
|40 Tonne||10 Tonne||Forklift traffic - special order, please contact us|
Unfortunately we are unable to supply covers without frames. All replacement covers must be fitted in their own frame, which means removing the old frame.
To ensure that you buy the correct sized cover and frame the key measurement to take is the clear opening size rather than that of the actual frame or cover. By measuring the clear opening this will ensure that your cover gives you the correct access required to your drainage system and is the correct size to sit comfortably on the surrounding material.
If your replacement cover is being fitted to a plastic inspection chamber then just measure the diameter of the chamber. Drainage Sales supply a variety of lightweight and heavyweight manhole covers in Galvanised Steel, Ductile Iron and Plastic, in various shapes and sizes.