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Installing Enviromat

First you must calculate your requirements.

Measure the length and breadth of your area in metres. Next multiply the two measurements together to find the total area in square metres. Decide on your preferred size of Enviromat tile and calculate how many pieces you will need. Multiply the area by 4 for large trays, or by 8 for small trays.

For example: if the area you need = 1.5sq m then:

1.5 x 4 = 6 large trays or 1.5 x 8 = 12 small trays. Alternatively you could order a single roll.

Preparing a soil- less surface for Enviromat

If you are planning to install Enviromat on a soil-less slope greater than 30 degrees, it may be difficult for the plants to retain enough water to stay alive. If you are unable to water your Enviromat in dry weather, it is well worth thinking about installing an irrigation system.


  • If you are constructing a domestic green roof, check first that it is waterproof as it is very difficult to repair leaks once the sedum matting is installed.
  • A root barrier such as heavy-duty polyethylene is advisable on roofs to protect the waterproofing from root damage.

Enviromat on a hutch roof

  • Ensure that the surface is well drained and even. Enviromat will not tolerate sitting in a puddle for any length of time. If water does tend to accumulate anywhere, consider adding a drainage layer to prevent the Enviromat's roots becoming waterlogged.
  • We recommend that either a layer of sand or gravel or a moisture retention mat be laid on the surface before your Enviromat is installed. Sedum plants are drought tolerant, but they are not drought proof. Moisture retention mat is a relatively inexpensive fleece which ensures that the plants have the right amounts of air and water to stay healthy and vigorous. In the long run - it means less work for you! A moisture retention mat is simply laid on to the surface with the ribbed side down running with the slope. This way, excess water will drain away once the fleece is saturated.
  • Trim the fleece to the right size and shape with a sharp knife.
  • Any joins should be butted up tight together so that there are no spaces between the pieces.
  • Drench the water retention mat to the point of water run-off, this will give the sedum plants a good start.
  • An application of slow release granular fertiliser at this stage will help your Enviromat to establish quickly. Be sure to follow the manufacturers instructions.
  • Time to Install Your Enviromat. (See below)


Using Enviromat on Soil

Laid onto soil, Enviromat will romp away providing you with a fantastic colourful display in no time at all. Installation is very easy and done properly you should have an attractive, low-maintenance feature for many years to come.

  • Remove weeds and debris from the area.
  • Check the condition of your soil. If it is prone to water logging, spreading a 4-5cm layer of sharp sand or gravel on top will improve the growing conditions for your Enviromat.
  • Ensure that you are happy with the levels and contours of the ground. Remember that Enviromat must be in contact with the ground below at all times. It will mould itself to gentle hills and hollows but it isn't flexible enough to cope with sudden dramatic changes in incline. If your design includes lots of changes of level, you might want to consider installing separate pieces of Enviromat to ensure the best possible results.
  • To make sure that no perennial weeds invade your Enviromat from below, we recommend laying a proprietary weed barrier (available from all good garden centres) before you put your Enviromat down. Simply follow the manufacturers' instructions. For pots and containers, a weed barrier is probably unnecessary.
  • An application of slow-release granular fertiliser at this stage will help your Enviromat to establish quickly. Be sure to follow the manufacturers instructions.
  • The soil should be quite moist (but not sodden) before installing your Enviromat.
  • Time for Installation.

"sedums are ideal plants for the busy person who would like to transform a piece of land into an attractive landscape feature with a minimum of effort and very low maintenance requirements" - Professor Ray Stephenson

Cutting Enviromat to Size 

  • Trimming Enviromat to size couldn't be easier - simply use a sharp knife, or even a hacksaw, to cut through all of the layers.
  • Always wear strong gloves, not only can the substrate be abrasive to skin, gloves offer extra protection to your hands should the knife slip.
  • When covering large areas with Enviromat, it is far easier and safer to lay the product in place before trimming.
  • A firm surface beneath the Enviromat will make cutting easier.
  • Don't worry too much about damaging the plants - they will soon recover.
  • Try not to "hack" at the product, a smooth cut will result in less substrate loss and tidier edges.
  • A small amount of growing medium may be disturbed during cutting but this shouldn't be detrimental to the product in the long term.

Lay your Enviromat in Place

  • Handling tray sized pieces of Enviromat is not at all difficult, simply put the piece where you would like it to sit and adjust the position to make sure that the mat is in contact with the surface below at all times.
  • Slabs and rolls of Enviromat are heavy so please be careful how you handle them. A two square metre roll can weigh up to 80Kg (12 Stones) - definitely a 2-person job.
  • There are no set rules for laying Enviromat on a flat (or flattish) surface, but common sense dictates that it is best to start at a far corner of your area and work backwards - that way you will avoid trampling on the Enviromat you have already laid.
  • Folded underneath each slab or roll of Enviromat is an extra flap of geotextile membrane. Once your Enviromat is in place, unfold this flap and lay it flat on the surface beside your sedum matting. The next piece of Enviromat will be laid on top of this to help anchorage.
  • On a slope, start at the top of the slope and work down. Strips of Enviromat should run at 90 degrees to the top of the slope.
  • If you are covering an apexed roof, by far the most effective way to lay Enviromat is to start at the eaves and take the sedum matting up, over the apex and back down the other side.
  • On a sloping roof, adding an edging of 50mm wooden baton fixed around the edge of the roof will give extra protection against drying, slippage and wind lift. It also gives a professional finish. Remember to leave approx 5mm gap between the baton and the roof to allow excess water to drain away.
  • On a sloping roof, felt tacks will give extra protection against slippage and wind lift.

Standard rolls of Enviromat are one metre wide. If your design means that you need to use a narrow strip of Enviromat as well as two or more wider ones, (eg if your shed roof is 2.4 m wide) try to avoid having the narrow strip on the outside - it will be far more secure in the middle.

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