Frequently Asked Questions

Rootlok FAQs

What applications can Rootlok be used for?

Flood protection works, river restoration, head walls, slope stabilisation, erosion control, reinforced soil structures, retaining walls, gravity walls, landslip repairs, road and rail, coastal protection, landscaping, SUDS.

What is the Rootlok Bag made from?

The bags are made from Permeable needle punched nonwoven polyproylene geotextile. The fabric we use acts as a filtration system and it is UV stabilised to increase the longevity of the system.

What are the Rootlok interlocking plates made from and how are they used?

The Rootlok interlocking plate is manufactured in recycled polypropylene by injection moulding. They are used through the system to join the gaps between each bag, locking the bags together and forming a solid structure.

Do you use recycled materials?

The interlocking plates are made using recycled materials however the Rootlok bags currently aren’t as we could not assure the high levels of quality required.

What are the Rootlok bags filled with?

It is a mixture of 70% clean sand and 30% compost to provide the right amount of organic matter to sustain vegetation. When used in a water application, bags below the average water levels are filled with clean fine gravels.

How much do the bags weigh?

Filled Rootlok bags weigh approximately 35kg.

Bag Dimensions

Bag when filled- 750mm L X 300mm W X 140mm H.

Interlocking Plates- 330mm L X 100mm W X 42mm D

Can I specify my own seed mix?

Yes, seed mix can be tailored to requirements and we can source a variety of UK native seeds. We also have our own bespoke low maintenance grass seed mixes.

What batter angle does the Rootlok system work at?

The Rootlok Sytem can be installed at angles between 40° to 85°.

Is there a maximum height?

There isn't a maximum build height, Rootlok can be used to build walls at any height.

What is the typical footprint of a Rootlok wall?

This varies on the application, it is typically 70-80% of the retained height of the wall. Where there isn’t sufficient space for the required footprint, there are other design measures we may be able to utilise to reduce it.

How deep is the foundation?

The foundation is typically 430mm deep, however this can decrease or increase depending on ground conditions and height of the wall.

Can I put fencing above the wall?

Yes, fencing can be installed behind the bag work. Where our team install the wall, we will install post sleeves ready for your fencing contractor to erect the fencing. Fence posts must sit a minimum of 500mm away from the front face of the wall.

Do you offer formal designs?

We offer a free initial design service. Formal designs can be provided at an extra cost and designed to EC7 & British Standards this will include professional indemnity insurance to £5,000,000. We can also provide a collateral warranty as an optional extra.

How much will the wall cost?

There are many variables to consider when designing a retaining wall, such as ground conditions, surcharges, retained height, ground water and installation restrictions. We provide tailored quotations for each project and the cost will vary. Contact us for a personalised quote.

What is used in the hydroseed mix?

Water, wood fibre with tackifiers, seed mix, nitrogen additives to continuously feed the wall and natural vegetable dye is used as in indicator of where we have hydroseeded.

Can Rootlok be used in watercourses?

Yes, however where the Rootlok bags are situated below the average water level they will need to be filled with clean gravel.

What is the general maintenance?

If the Rootlok wall is installed during the drier months, regular watering will be needed to assist seed germination. We also recommend regular watering of the structure where plug plants have been used. Once vegetation is established, the structure will only need watering during prolonged periods of dry of weather.

Any cutting or strimming must be done at least 10cm from the wall face to protect the integrity of the Rootok system.

We recommend inspecting the structure every 1 to 2 years to identify any injurious weeds, large self-set plants, and burrowing animals.

Will the system not degrade?

Rootlok makes use of materials and manufacture methods to prevent the system from ‘degrading’. To maximise longevity of a Rootlok installation, it is essential that the system is vegetated as it protects the structure from UV degradation.

Is Rootlok approved by the Environment Agency?

We have had several EA and NRW approvals and specifications. We continue to work with the Environment Agency across England and Natural Resources Wales on a number of projects.