On this page are some useful questions and answers about Flex MSE.

Asked Questions

Flex MSE is made from Polypropylene(PP). PP is one of the most stable, non-toxic, and durable plastics made.

Our Flex MSE interlocking Plate is made with 100% recycled injection mould PP, while the GTX Bag is made with virgin Geotextile material.

Flex MSE is very simple to install. Smaller DIY projects are an easy weekend project for homeowners with little or no experience.

Contractors installing Flex MSE for the first time will find many similarities to other segmental systems, and many distinct advantages.

A clean .25” minus material mixed with high quality soil at 70/30 by volume is typical. Bags may be closed with zip ties, galvanized rebar ties, hog rings, or stitching.

There are several ways to plant a Flex MSE installation. You can choose simple and low maintenance options, or more intricate custom aesthetics.

Grasses grow beautifully in Flex MSE. Hydraulic seeding (‘hydroseeding) of the facing is very common.

Live planting with native groundcover plugs directly into the Bag, or laying more mature plants between Bags as you build also gives great results.

Often, a combination of methods are used to create the desired effect. See the Vegetation section for more details.

Anywhere up to 85° with the same two components. The typical range for Flex MSE is between 35° and 85°.

Angles less than 35° require a tiled ‘mattress’ layout, as opposed to the typical stacked ‘running bond’ layout.

Thanks to the interlocking soft-armour capabilities, it’s simple to integrate different angles into the same structure. Beautiful, curved designs are a breeze with Flex MSE.

Any Flex MSE structure over 2’ high should integrate a tie back/reinforcement system such as geogrid. For walls under 6’, Flex MSE Bags can be regularly turned 90° to the face. This is called the Tie Back Method. Geogrid is typically used at lengths embedded into the backfill to 80% of the wall height (1m minimum lengths) and spaced every three to four layers of Bags (18-24″). Non-engineered walls over 2′ in height must include either Tieback or regular Geogrid Reinforcement. Reinforcement lengths and elevations may need to change depending on soils, surcharge, or other site conditions. Design assistance from a qualified Engineer will be required on all structures taller than municipal limits and is recommended for all sites in/around water. UKSB provides standard CAD drawings for a host of applications, as well as Specifications and Best Practices. We also have a full Installation Guide available, please contact us for more information.

Before undertaking any retaining wall or slope stabilization, please contact your local permitting bodies for building guidelines.

Local Authority planning departments have different guidelines depending on local soil conditions and topography. Typically, 3’ – 5’ (1.5m) high of exposed facing is the limit for any system before having to get an Engineer to design a wall or slope.

Always check with your local Building Control/Planning Department prior to building.

Typically, only one layer of Bags on top of 6” of gravel is required subgrade to lock the toe of the wall into place (12″ of excavation).

Engineered walls can specify additional layers of Bags subgrade depending on soils, hydrology, and surcharge. Walls built in waterways should consider the effects of scour on the ends and bottom.

Flex MSE is on average 60% the cost installed versus other hard armour systems and has lower repair and maintenance costs. Facings with larger architectural finish concrete masonry blocks can be 3x the cost of Flex MSE installed.