jointing material makes the difference

"The goal is to control stormwater at the source, reduce runoff and improve water quality by filtering pollutants in the substrata layers." Wikipedia

There are numerous permeable paver options on the market, with offers from most major manufacturers. ‘Permeable pavers’ are not themselves pervious, but instead have wider joint spacing between each paver to allow stormwater to flow down and through to the sub grade below. Pre-cast permeable pavers have larger built-in joint spacers, and natural stone pavers are simply set with a wider joint line, commonly from 6mm wide and up.

However, all permeable pavers have a common design component for their assembly - that the joints are filled with "loose grit". This creates an inherent challenge for the performance, resilience, and cost of the system.

Without consistent maintenance, weeds grow in between the pavers.

Or even worse, cigarette butts.

"Loose grit" does not stay in place over the long term to keep pavers held together. “Loose grit" does not stop weeds from growing up and ants from digging down. “Loose grit” will collect organic matter and grow moss which stops permeability. “Loose grit” will collect other things, like garbage and cigarette butts. And finally, when it gets dirty or mossy, “loose grit” cannot be cleaned or power-washed.

The remedy presented for cleaning loose grit and restoring permeability? Vacuum up the compromised loose grit from the joints with a large vacuum truck, and re-install new loose grit – and start the cycle over again. This is commonly required to be re-done each year. While materials are cost-effective up front, re-installation costs continue to add up over time. We ask - can’t there be a better way to build lasting, functional, and low-maintenance permeable paving? There is...


With Romex resin-based permeable Jointing Mortar, it’s a one-and-done solution. Installed in a fluid state, the resin-sand mixture fills every joint completely and without voids, sinking down deep in between each paver, connecting to their sidewalls and connecting to the bedding layer beneath. Then, as the Jointing Mortar sets, its unique structure creates an obscenely strong and comprehensive connective network between all the pavers, securing them together as one to form a strong, cohesive surface – while still allowing rainwater to flow down and through the paving assembly.

Example of Romex permeable paving

Done with Rompox Drain

Romex Jointing Mortar will stay in place and keep the pavers secure. Romex Jointing Mortar will stop weeds from growing and stop ants from digging. Romex Jointing Mortar will not collect garbage or cigarette butts. And at the first sign that Romex Jointing Mortar is getting dirty or mossy? It can be cleaned and power-washed – every year, every month or every week if you like – and it’s appearance and permeability will be restored.

If you want more information about permeable paving, please refer to this Wikipedia article.

Read on to find out more info about what makes Romex paving permeable and find infographics that show the difference between permeable paving and sealed surfaces for the local environment and water system.


A synthetic resin paving jointing mortar is always made of two components. The first component is a binding agent, which is responsible for hardening and stability. The other component is the filler material, which is responsible for water permeability. The filler material component is a washed, fire dried quartz sand with various grain sizes. The quartz sands have no zero components, unlike cement (cement dust). This means that hollow areas can form, through which water can seep. The size of the hollow areas, which depends on the grain size, determines the degree of water permeability. Especially during winter, the advantage of large hollow areas is evident. Water, that is still in the joints during ground frost, freezes and is able to expand into the hollow areas. This means cracks and breakage in the joints is avoided.

Grain Size is the Deciding Factor

The capillary effect is the way liquids react when they come into contact with capillaries i.e. tight pipes, cracks or hollow areas in hard materials.

Example: if you dip a glass tube vertically into water, the water will rise slightly in the tube against gravity. This effect occurs due to the surface tension of the liquids themselves and from the border surface tension of the liquids with the hard surface ( in this example: glass).

In the construction industry, when synthetic resin bound paving jointing mortar is used i.e. on paved stone surfaces that have been jointed with synthetic resin based paving jointing mortar, the capillary effect can be seen in the joints, because depending on the jointing mortar used and the pore content or sand grain size, varying amounts of moisture are able to rise against gravity. This means that even if a foundation is only slightly water permeable, water will not remain permanently in the joints.

Using ROMEX systems, you can do your part to be environmentally friendly. ROMEX products strengthen surfaces, paths and squares, without sealing them!

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