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Most commonly asked questions

  • Are there different construction methods for Secura blocks?

    Secura Lite can only be constructed as a gravity wall. Secura Grand can be constructed as a gravity wall, a reinforced wall or a concrete backfilled wall. See Tobermore Secura product page for full details.

  • When do I need to use geogrid reinforcement?

    Usually once your wall height goes above 1.2m geogrid reinforcement will be required, although it may be required below this height if there is a high surcharge on the wall. Please refer to Tobermore Secura Guidelines brochure or consult an engineer. Geogrid reinforcement can only be used with Secura Grand and Secura Major.

  • Which products in your range are permeable?

    Products in our range which are prefixed by the word Hydropave are permeable. You can find our full Hydropave product range here.

  • What is geogrid reinforcement?

    Geogrid is a high strength geosynthetic mesh material used to reinforce soils. Geogrids are available in various strengths and come in rolls. For all Secura Retaining walls designed and built to BBA requirements Huesker Fortrac geogrids must be used.

  • Which Tobermore products have a smooth finish?

    You can find a full list of products with a smooth finish here.

  • Where can I find a list of Tobermore stockists?

    You can find a list of Merchant’s stocking Tobermore products here.

  • Do Tobermore supply Tactile Hazard Warning Paving?

    Yes, Tobermore’s range of Tactile Flags are designed to assist pedestrians who are blind or partially blind. There are three types of paving in the range: Blister, Hazard Warning and Cycleway. Each type of paving flag has a specific layout pattern to indicate different kinds of crossing zones.

    Find out more about Tobermore’s Tactile flags here.

  • Do Tobermore provide products with delineation strips?

    Yes, we can supply Mayfair Step Flags and Granite Step Units with delineation strips.

  • Does using Hydropave Permeable Paving improve water quality?

    Worldwide research has shown that permeable pavement systems are very effective at cleaning and improving the quality of water entering them. A report by CIRIA ( Construction Industry Research and Information Association ) demonstrated that permeable pavement can remove 60 – 95% of suspended solids and 70 – 90% of hydrocarbons.

  • How does Tobermore Hydropave Permeable Paving reduce surface water run-off?

    Permeable pavements mimic natural water behaviour of undeveloped sites by allowing rainfall to infiltrate through the joints in the paving.  Depending on the site conditions rain is allowed to either drain into the ground or attenuated and released slowly to secondary drainage systems. Typical flow rates for water exiting a permeable pavement are 2 to 7 l/s/ha (litres/second/hectare).

  • Why should I choose Hydropave Permeable Paving?

    Climate change in the UK means we are getting more rainfall events and the intensity of these events is increasing. Traditional drainage techniques are unable to cope with the extra surface water run-off. To help combat these issues the UK Government has introduced The Floods and Water Management Act 2010 ( England and Wales). This act aims to replace the traditional methods of handling surface water run-off with SuDs solutions. ( Sustainable Drainage Systems ) Permeable pavements are regarded as one of the most cost effective and useable SuDS methods of storing and infiltrating/filtering surface water.

    To find out more read our Permeable Paving blog.

  • Is Permeable Paving more expensive than traditional paving?

    When whole life costs are considered permeable paving systems can be more cost effective when compared to traditional pavements. When designing and constructing permeable pavements there is a reduction in the requirement for gullies, drainage pipes, manholes etc. Further savings can be made due to the fact that oil interceptors are often not required when using permeable paving due to it’s ability to clean the water.

  • Can permeable pavements be used on steeply sloping sites?

    There are different design methods to cope with sloping sites. These include constructing check dams or baffles within the sub-base to restrict the flow or increasing the depth of the sub-base. The maximum gradient without the need for baffles is usually 1:20. Contact Tobermore for more information regarding sloping sites.

  • How do I detail soft landscape areas adjacent to Permeable Paving?

    It is important to prevent soil being washed onto the surface of permeable paving as it could clog up the joints. Detailing soft landscaping at the edge of permeable paving is especially important.

     

  • How do I install Hydropave Permeable Paving?

    Specific guidance on how to install Hydropave Permeable Paving can be found here.

  • Is Hydropave Permeable Paving installed in the same way as non-permeable paving?

    No. Hydropave is installed using a different method with different sub-base and jointing aggregates to allow for infiltration and storage of water. Please consult our installation guide here.

  • What is Tobermore Hydropave Permeable Paving laid on?

    Tobermore Hydropave Permeable Paving should be laid on 6 – 2.3mm clean grit to BS EN 13242. The depth of this layer should be 50mm.

  • What aggregate is used for the sub-base in a Hydropave Permeable Paving system?

    A 4/20mm coarse graded aggregate to BS EN13242:2002 / BS 7533 Part 13 should be used.

  • What material should be used to fill the joints when using Hydropave Permeable Paving?

    A 6 – 2.3mm clean grit to BS EN 13242 should be used ensuring that the joints are completely filled. Joints should be topped up if necessary after use.

  • What depth of sub-base is needed for Hydropave Permeable Paving?

    This depends on the loading category, the CBR , the infiltration rate of the ground and how much water needs to be stored. Please contact Tobermore for assistance.

  • If I have heavy traffic how do I strengthen to sub-base?

    A punched layer of Dense Bitumen Macadam ( DBM ) can be used to strengthen the pavement sub-base. Alternatively Hydraulically Bound Coarse Graded aggregate can also be used. Guidance on this can be found in BS 7533 Part 13 or contact Tobermore for details.

  • Will local authorities in England, Wales and Scotland adopt areas of Permeable Paving?

    The number of local authorities who are adopting permeable pavements is increasing as they see the benefits of using it and understand that they are cost effective to maintain. See our permeable paving blog for more details.

  • Can I install Tobermore Hydropave Permeable Paving over Geocellular storage crates?

    Yes, this can be done by installing a geotextile on top of the crates. The bedding layer of grit is then installed on top of the geotextile. Contact Tobermore for further guidance.

  • Do Tobermore have slip/skid results for Hydropave products?

    Yes, these results are on the individual specification sheets which you can download from our website here.

  • What are Segmental Retaining Walls? ( SRW’s )

    Segmental retaining walls consist of modular concrete blocks that interlock with each other. They are constructed without mortar and are used to retain a sloping face of soil. They have an integral nib at the rear of the block which automatically creates a set back as the wall is built.

  • What is the degree of set back for Secura Grand?

    Secura Grand has a 7 degree set back which is automatically created by the nib as the blocks are stacked.

  • Why does Secura Grand have two voids in the block?

    The voids make the block lighter and easier to lift and construct on site. The voids are also filled with 10mm single size drainage aggregate to provide extra stability and improve drainage.

  • Do Tobermore have different types of Secura blocks?

    Yes, Tobermore supply Secura Lite which is used for low height walls below 960mm in height and Secura Grand and Secura Major which are used for higher walls. Visit our dedicated Secura walling website page here.

  • Can I cut Secura blocks?

    Good design and planning before construction commences can reduce the number of blocks which require cutting and save time. If it is necessary to cut the blocks you should use a masonry saw or bolster and hammer.

  • Do Hydropave Permeable Pavements require lots of maintenance?

    No, they actually require very little maintenance compared to the sometimes onerous maintenance required for traditional drainage systems which require gulley cleaning on a regular basis.

    Tobermore Hydropave products ensure a high joint void width percentage to accommodate the correct grit grading, reducing maintenance and maximising drainage flow rates.

     

  • What does gravity wall mean?

    The term gravity wall means a wall which relies on its weight to retain the soil behind it. The weight of the blocks and their set back create the retention.

  • Is there a maximum height that I can construct Secura Lite?

    Yes, the maximum height for Secura Lite is 960mm.

  • What are Secura retaining wall blocks?

    Secura retaining wall blocks are blocks used to construct segmental retaining walls.

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