Frequently asked questions about resin bonded and resin bound gravel.

What is the difference between the bonded & bound system?

The Bonded system involves the process of applying the resin to the substrate dressing it with aggregate then once dry removing the excess aggregate. The finished surface has a natural textured finish and some excess aggregate will remain. The finished surface averages 3-5mm in depth using a 1-3mm aggregate.
The Boundtex resin bound system involves the process of completely encapsulating the aggregate within the resin and is usually applied to between 15 - 18mm in depth. Resin bound gravel is water permeable and there is no loose stone.

Is either system porous/permeable?

Yes the resin bound system is porous, as is AquaPave water permeable paving. The resin bonded system is not.

Which is the right system for me?

Resin Bound Surfaces Group Materials Ltd is one of very few companies in the UK that can install both systems. Because of this we have no preference to which you chose meaning you'll receive completely unbiased advice. Different systems suit different projects and you will receive balanced advice and information about each systems so you can make an independent informed choice.

What are the benefits of a seal coat on a resin bonded gravel system?

A seal coat can be applied to the bonded system. This will improve stain resistance, make cleaning easier & reduce the amount of loose aggregate to a minimum.
How do I clean stains off?

You can apply engine degreaser then lightly scrub with a stiff brush before washing off.

Can I lay it myself?

If the area is larger than 50m2 we would recommend that you use our fully trianed installers, however DIY Kits are available for smaller projects.

Can resin bonded or resin bound aggregate be installed directly on to a compacted type 1 or hard core base?

No both surfaces have to be applied to a structurally sound substrate of tarmac or concrete.

Can the systems be jet washed?

Both systems can be jet washed using a jet washer of up30 120bar not closer than 6 inches to the surface.

Can they be installed all year round?

Both systems can be installed all year round providing the ground is completely dry & the temperature is above 5oC.

How long before I can drive on the surface?

It is possible to drive over the resin bonded system 4 hours after installation however, in our experience we recommend that you leave it for 8 hours before driving your car over it. We recommend leaving the resin bound system over night.

How much resin should be used in a resin bound system.

Resin Bound Surfaces Group Materials Ltd recommends for vehicle traffic a minimum of 7kg of resin is used per 100kg of gravel. For foot traffic we recommend 6kg of resin per 100kg of gravel.

How to check you’re being charged the correct amount for a resin bound gravel surface.

Resin Bound Surfaces Group Materials Ltd work on a 4:1 ratio which means 4 x 25kg bags of gravel are used for each tub of resin used. This ensures that the surface is installed to the correct standard. (Some contractors change this ratio to 5:1 to reduce costs by 20% but this in turn will downgrade the quality of the surface to the point that it is likely to fail).
Another thing many contractors do is reduce the surface depth again to reduce costs but this will also cause the surface to fail quickly.

I have loose gravel on my drive that moves all over the place can i bond it together with resin?

No, the aggregate required is specialised and must be kiln dry, dust free and the correct size for the application.

Should there be an edge detail?

You should either have an edging already, or need one installed. This is so that the finish is neat and tidy, and the edges are protected by spalling.

What are the correct minimum resin bound gravel layer depths.

1-3mm gravel = 12mm deep.
2-5mm gravel = 15mm deep.
3-6mm gravel = 18mm deep.
6-10mm gravel = 24mm deep.
            Smaller stones require more resin as the surface area of the gravel increases.
            For example 1-3mm stone = 6kg resin 75kg gravel.

What size area can be covered in a day?

Depending on the condition of the base, once prepared we can install up to 1000m2 a day of bonded aggregate using 10 installers and 300m2 a day of bound aggregate using 6 installers.

Will the systems fade in sunlight?

The resin bonded gravel system will retain its colour and the resin bound system non UV will show a slight yellowing but this is only used when it enhances the colour and the aggregate used. The resin bound UVR system will retain its colour even with white aggregate.
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