Permacrib is our timber crib gravity retaining wall system. For over 30 years we have designed, supplied and installed many Permacrib walls on a wide variety of different projects, ranging from major civil engineering projects such as the Channel Tunnel Rail Link to small back garden projects for private developers. Sustainable, aesthetically pleasing and quick to build. Permacrib is the No 1 timber crib wall system.
Permacrib uses timber header and stretcher components to create a ‘timber cage’ which is then filled with a graded stone to create its mass. The gravity retaining wall principle means that the mass within the wall resists the applied forces. Consequently the higher the wall needs to retain, the deeper the structure needs to be. Permacrib has 8 different model sizes ranging from header sizes of 600mm to 1650mm, so we can provide the most economic structure possible. We have built Permacrib retaining walls up to 10m in height using double or even triple depth structures. Header stacks are typically 750mm apart and course heights are in increments of 161mm. This means that we can deal with variations in foundation levels or top of wall levels very efficiently. The standard lean back for a Permacrib timber crib wall is 1H:4V (76 Degrees)
Manufactured from PEFC certified timber, the Permacrib components are machined in the UK to an approved QA system, ensuring high dimensional accuracy. It is then pressure treated to BS8417:2011 using High Concentration Copper Azole preservative. Complete cell penetration is achieved to give full protection. Our UK manufacturing and treatment plants are subject to stringent environmental health controls and checks. All Permacrib components have a Desired Service Life of 60 years, and we are proud that Permacrib is the only timber crib system to have gained BBA Certification.
Timber is still the most sustainable construction material in use and is also very flexible to work with. Aesthetically it is a much softer solution than a traditional RC, or sheet pile wall would be, so it ideal for projects where how it looks is important. We can introduce planting bags within the Permacrib wall to enable planting of the front face, so an ever softer finish can be achieved. Corners, curves and angle changes are also very easy to incorporate into the wall design.
The main benefit of the Permacrib system is the economic advantages it can offer. Many walls we install started off life on a drawing as an RC wall or a standard masonry block wall. Introducing Permacrib as an alternative, can save you money and time, due to its very fast rate of installation. Whether it is a major retaining structure, or a simple landscaping wall, Permacrib can add value to your project or tender. Whatever the size of your project, our in house engineers can provide a quotation and technical appraisal for a Permacrib retaining wall to suit your specific requirements.