• What are the recommended uses for the FLW-400 layer?

The product is particularly recommended for protection against root penetration on shallow green roofs, with regular drought resistant vegetation. Ideal for garage roofs, canopies or outbuildings. It can be used for partial greening of larger roof areas and is a perfect answer for lining planting beds.

• How to handle vapor permeability

Due to its excellent vapor resistance properties, it also acts as a vapor block layer. However, depending on the construction it needs to be engineered according to the thermal nature of the building.

• How can you be sure about the protection a product offers against root penetration?

There are test methods which set a 2 year and a 4 year test period for root penetration. Certificates are given only after one of these tests are completed with positive results.

• Does the root protection layer need to be protected itself?

Guidelines recommend protecting root barrier layers against mechanical damage during installation and maintenance of the green roof.