Bolt Down Retaining Wall – Frequently Asked Questions

Bolt down retaining walls FAQs

We’ve spoken to hundreds, if not thousands of people over the years and have answered a huge range of questions. There are some that we’re asked all the time so we’ve made a list of the most popular for you.

If there’s anything else you’d like to know about this product, you can check out the bolt down retaining wall product page – call the team or drop us an email.


Everything you need to know about bolt down retaining walls – FAQs

Q. How much does a precast retaining wall cost?

A. To get an accurate quote for your project, you should get in touch with the team to make sure we can price the best product for you. But as a guide – a full load of 1m high units delivered within a 100-mile radius of Nottingham, the price would be in the region of £80 +VAT per m²

Q. How easy is it to install the units?

A. The lifting and fixing systems have been designed for ease of use, no specialist training or equipment is required. Precast elements can be off-loaded and installed using standard site plant, e.g. 360 excavator/telehandler. Speed of installation will depend on the location and experience of the contract’s teams, we would expect to install in the region of 25-30 units (metres) in a day.

Q. Can you install the retaining walls for us?

A. Absolutely – we have our own construction team who can take care of this for you. Prices will vary from job to job and start from £30 per metre for the modular retaining walls.

Q. What is the weight of a bolt-down unit?

A. The retaining walls units weigh a maximum of 2.59T (2590kg) for the 3.75m high unit. Please refer to the product brochure and datasheets for all unit weights.

Q. How are the retaining walls delivered?

A. We can arrange transport of the units direct from the factory to your site. The most common vehicles we use are articulated flat-beds – but we can also price for HIAB delivery with off-loading or smaller vehicles if space is tight.

Q. Which materials can the units retain?

A. The retaining wall units are suitable or retaining a wide range of materials, from agricultural crops – to aggregates and earth.

Q. What is the load capacity of your retaining walls?

A. Units are designed to retain material with a density of up to 18kN/m³ and can also take an additional surcharge of 10kN/m².

Q. What grade of concrete do you use?

A. Typically, C50 concrete mix strength is used for the manufacture of these precast units. Our modular walls have a higher compression strength of C60.

Q. How much concrete cover is there over the reinforcement?

A. There’s a minimum of 30mm cover as standard to units, which will give you a 50-year design life.

Q. Do the units need to be fixed down?

A. Yes, due to the length of the toe the units must be resin anchored to a suitable foundation.

Q. Where can we purchase the fixing kits from?

A. We supply the full fixing kits – (Sika AnchorFix®-1 Fast curing anchoring adhesive and steel dowel bars) – and lifting equipment with all orders as standard.

Q. What is the minimum embedment depth for the fixing kits?

A. The dowel bars for the 1m high units are embedded 150mm into the foundation. The depth required will increase with the height of the precast unit.

Q. Which side(s) can the retaining walls be loaded on?

A. The units will retain material on either or both faces – sometimes called a double load unit.

Q. What is the minimum/maximum height available?

A. Units are manufactured in heights from 1m up to 3.75m, typically in 250mm or 500mm increments. Other retaining walls in our range start at 500mm high and go up to 6m.

Q. Can you seal the joints between the precast units?

A. Yes, we have a range of SIKA products that can be used to create weatherproof & watertight joints between the units.

Q. Do you supply corner units?

A. 22.5-degree, 45-degree and 90-degree corners can be created using precast corner units. Depending on the retaining wall layout, other angles can also be created.

Q. What is the lead time on these walls?

A. We try to keep a good amount of units in stock – but depending on the time of year and number of orders, you can get lead times of up to 4-weeks. It’s always worth speaking to the team to get an accurate timescale from order to delivery.