GftK vdw 855, commonly used on stone and manufactured paver streets. This product is well known for years of extremely low maintenance cost in all conditions! It has a very low permeability rate of approximately 2 cups per minute per 10 sf at 20% joints. It has a very high compressive strength of 6,500 psi. (high performance for heavy traffic loads)

Gftk vdw 850, for light traffic and sidewalks. A medium permeability rate of 2 quarts / min / 10 sf at 20% joints. Its compressive strength is 3,625 psi at 20% joints.

GftK vdw 800  has an exceptionally high permeability rate of 16 gallons / min / 10 sf at 20% joints. Its compressive strength is moderate at 2,175 psi. (Light to medium traffic)

GftK vdw 525  is permanently water permeable. Compressive strength is 15N/ mm2. For pedestrian areas and light traffic loads, tree pit systems. Attractive for decorative use.

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