There is a jointing product designed for those closed or tight joints that are especially desirable in designs for Porphyry Cubes.  Vdw 805 from GftK is a high performance jointing mortar for narrow joints (> 3mm) in small format natural stone paving. This jointing material is appropriate for light to medium traffic loads, such as patios, footpaths, driveways.
GftK is the clear European market and technology leader in Pavement Jointing Mortars for use with all types of natural stone and quality concrete block paving – for both new work and refurbishment projects. The product range includes systems for all different sizes of joint and all different traffic loads – from patios to commercial pedestrian areas, to paved areas with occasional light to heavy vehicles, plus heavy vehicle turning, unloading and hard standing areas. The GftK Jointing Mortars are all produced in Germany, fully in accordance with ISO 9001 / ISO 14001. The GftK range includes paving jointing mortars that are ideal for garden patios and pathways, driveways and car parking areas, town center streets and pavements, commercial developments, historic market squares, and in a variety of shades to suit the clients’ needs.
This material is fast, durable and cost effective
• Easily flow applied • Can be applied on damp / wet surfaces and in light rain • Clean, stain free surfaces • Optimum strength correlation • Water permeable • Mechanical sweeper resistant • Abrasion resistant • Highly frost and de-icing salt resistant • No weeds or boring insects • Environmentally friendly
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Aspects of a closed joint with Porphyry cubes:

A closed joint is usually 2-5mm in width. The adjacent paving cubes are close to each other but not actually touching at any point. This joint width is useful in dealing with the dimensional variations in Porphyry cubes.
This arrangement allows a fine-grained joint material to fill the joint and create an essential cushion between the paving units and to generate a huge amount of both horizontal and vertical interlock which helps ensure the porphyry cubes remain firmly where they are meant to be.
Horizontal interlock is the friction generated by the jointing medium which helps the paving units resist forces which try to shift it in the horizontal plane, either backwards, forwards, side-to-side, or rotationally. Vertical interlock is the friction generated by the jointing medium which helps the porphyry cubes resist forces which try to shift it in the vertical plane, up or down.
Unlike a butt joint where spalling can occur as the stone moves through expansion or load forces, closed joints leave a small amount of space between stones. Spalling is chipping or other damage to the edge of the paving unit often caused by the stone being in direct contact with an adjacent unit.
Milestone Imports is the US exclusive importer/distributor of GftK.  Milestone Imports is available in United States to provide full technical assistance on GftK pavement jointing mortars. On-site support is also available.  For more advice or assistance with your specific project including the right jointing product, the estimated consumption, and the estimated time required for application, plus any other aspect of paving jointing, grouting, pointing or repointing please call Miles at 866.641.1999 or contact through