In some cases, it might be necessary to place a shock-absorbing subsurface underneath your artificial lawn. Not a problem, but it is important to choose the right kind of substrate. A foam layer that is too light can make the artificial grass crease. This will occur especially with high temperatures or big temperature fluctuations.
How do creases develop?
In some cases, artificial grass can start to crease because the wrong type of foam has been used. In all cases examined, foam of PUR was being used. This type of foam is normally used for packaging and acoustic purposes. As this foam has a very low density (only 150 to 200 kilos per cubic meter), it contains a lot of air. This makes this type of foam more likely to shrink with higher or lower temperatures. In addition, this type of foam has a rough structure, causing it to stick to the base of the artificial grass like Velcro tape. This causes the artificial grass to move with the foam when it expands or shrinks.
What is a suitable shock-absorbing subsurface?
It is advisable to place Royal Grass® artificial grass on a subsurface of soil. Cooler soil causes the least stretch or shrinkage of the artificial grass. However, in case a shock-absorbing subsurface is needed, it is best to use foam with a high density. Make sure the foam has a density of at least 300 kilos per cubic meter (preferably a density of 500 kilos per cubic meter). There are also foam layers with special cuts and grooves that are prepared for temperature fluctuations. Stretching and shrinking should then be minimal.
The artificial grass products of Royal Grass® have been developed in such a way that the products experience as little hinder from stretching and shrinking due to temperature changes as possible. For instance, they have been fitted with double backings and an extra layer of fleece. When installed on the right subsurface, Royal Grass® artificial grass will hardly crease.
How to prevent creases?
- Install Royal Grass® artificial grass on a subsurface of soil.
- If needed, use a shock-absorbing substrate with a density of at least 300 kilos per m3.
- Choose a substrate that has been prepared for temperature fluctuations.
- Give the artificial grass extra weight with sand (minimum of 5 kilos per m2).
- If needed, use special groundpins to secure the artificial grass.