Q: Is Self-Binding Gravel free draining?
A: Self Binding Gravel is not free draining and therefore requires a cross fall or camber to shed water from its surface into adequate drainage.
Q: What depth is Self-Binding Gravel laid to?
A: Self-Binding Gravel is laid to a finished compacted thickness of 50mm. This ensures that fines will not float to the surface when water rolled.
Q: Do I need to use edgings?
A: Edgings are optional. Concrete, timber, metal or stone edgings can be used and will help achieve fullest compaction. However, edgings should not stand proud of the Self-Binding gravel.
Can Self-Binding Gravel be laid on a slope?
Self Binding Gravel is not recommended to be laid on slopes steeper than a 1 in 15 gradient. This is because the action of stormwater flowing across the surface can cause damage to the material, resulting in the occurrence of pot holes and ruts. The installation of steps at irregular intervals will reduce the risk of ruts occurring and damage to the finished surface.
What is the minimum/maximum gradient to shed surface water?
An adequate gradient for smaller areas (such as footpaths) would be 1 in 50 to allow water to shed from the surface, however for large surface areas such as car parks or driveways, then a minimum of 1 in 40 gradient would be preferable (25mm drop for every metre of width).
How long does Self-Binding Gravel take to set?
This is dependent on the weather conditions at the time of laying and can vary from 1 week to two weeks plus in the wet colder winter months. Self-Binding Gravel should be treated with respect in the first 3 months whilst gaining strength. After that, the more the area is used the better it will perform.
Will the material pick up on my shoes?
Self-Binding Gravel is a natural material and will pick up on shoes, especially when the material is wet. A paved area and a good doormat is an advantage before entering buildings etc. The dusting effect will lessen with time once the material has been weathered.
Is Self-Binding Gravel available in any other colour?
Self-Binding Gravel is only available in a natural golden buff colour which lends itself to natural historical and modern day surroundings.
Can heavy vehicles be used on the area?
Self-Binding Gravel has the strength and durability to allow heavy vehicles to drive carefully on the surface. However, if a vehicle is stationary and the wheels are turned, this could cause scuffing and potholes, particularly when the material is wet. It is advisable to apply a speed limit of 5 mph.
Is Self-Binding Gravel suitable for use on car parking areas and driveways?
Yes, but please bear in mind that Self-Binding Gravel is a 100% natural limestone product and will sustain scuff damage to its finished surface if the steering is used on stationary vehicles.
Please ensure that adequate drainage is installed prior to the surface being laid.
Is Self Binding Gravel suitable for bridleways?
Yes, but as bridleways are often in woodlands or fields, the sub-base should be above ground level to allow water to drain off the surface. If this isn’t done and the bridleway is lower than the surrounding area, water will flow down onto the bridleway and will pond, causing weakness and potential potholes.
Is Self Binding Gravel suitable for Seating/Patio Areas?
Self Binding Gravel can be used underneath seating areas. However, dragging of patio furniture feet across the surface may dig into the Self Binding Gravel, causing it to scuff. A paved hard surface area would be preferable in this instance. Please ensure adequate drainage is installed so that surface water is not held on the patio area.
Is Self Binding Gravel suitable for wheelchair use?
Yes, Self Binding Gravel provides a solid bound base which does not separate or segregate with wheelchair use. The surface does lightly scarify with use leaving a dressing of grit/chippings on the surface, please note that this may pick up on shoes or wheels so it would be advisable for a hard paved area prior to entering a building to reduce the migration of dust.
Can Self Binding Gravel be used in tree pits?br>
Self Binding Gravel must be laid onto compacted Type 1 sub-base, if it is not possible to roll the material around tree pits then hand compaction must be used. There must be watering points for the trees as Self Binding Gravel is not free draining. Please be aware that movement of tree roots in time may cause cracking of the material and after rainfall continual drips from branches may wash away the fines content leaving coarse chippings on the surface.
What is the pH value of Self Binding Gravel?
The pH value is 8.3.
What do I do if potholes occur?
If a pothole occurs it must be repaired as soon as possible otherwise rainwater will lie in the hole and ingress into the Self Binding Gravel making the pothole larger.