The information contained in this document is intended as a guide when laying NatraTex products. 

Overview  

NatraTex products are proprietary decorative hard landscaping materials, working with Shell’s Mexphalte CLT  clear synthetic binder, which is manufactured and used extensively throughout Europe. This unique binder is  combined with complimentary aggregates at the dedicated Gloucestershire production facility to  manufacture surfacing products that can be used in a number of applications and is available in a range of  different colours.  

NatraTex products are manufactured on an asphalt plant similar to that used in the production of  conventional black asphalt, is supplied in hot format and is laid in the same way as conventional black asphalt  (however, it’s important to make sure that all equipment: boots, rakes, barrows, pavers etc., are clean!).  

NatraTex uses the clear binder and natural aggregate to produce an attractive and durable surface. We use  a range of aggregates to provide both colour and performance. Also, the addition of pigment is adjusted to  produce bright & vibrant natural finishes.  

Samples & brochures are provided to solely give an illustrative guidance to the NatraTex product range and  there may be differentials in colour & tone found in the supplied materials. 

The aggregates used range from flint gravels to high skid resistant stone if a PSV (Polished Stone Value) has been  specified. NatraTex boast long-term colour retention, are largely maintenance free and cost-effective when  compared to other aesthetic systems.  

Technical Details  

Pavement structure below the NatraTex layer may be identical to that of a conventional asphalt / macadam  surface course.  

NatraTex is supplied in nominal sizes of 6mm and 10mm depending on usage. 

Nominal Size (Aggregate) Mix Design Loading & Application
6mm Dense Grade (DG) Light domestic, Cycleways, Pedestrian.
6mm Fibre Enhanced (FE) Driveways, Occasional utility vehicles.
6mm Heavy Duty (HD) Driveways, Residential Roads, Turning Area, Parking Area.
6mm Porous – SUDs Compliant Light Domestic, Cycleways, Pedestrian **
10mm Dense Grade (DG) Light Domestic, Cycleways, Pedestrian
10mm Fibre Enhanced (FE) Driveways, Residential Roads, Turning Area, Parking Area, Occasional HGV.
10mm Heavy Duty (HD Residential Roads, Turning Area, Parking Area, HGV, High, Volume Motor Vehicles, Busy Driveways.
10mm Porous – SUDs Compliant Light domestic, Cycleways, Pedestrian**

 

** Subject to technical review. 

Installation  

Preparation 

NatraTex should be installed in accordance with BS 594987 Рthe standard for Asphalt for roads and other paved  areas.  

All equipment needs to be clean to avoid contamination, resulting in discolouration of the finished surface.  

We strongly recommend that NatraTex should be machine laid, particularly the Heavy Duty & Porous ranges. It  is appreciated that this may not always be possible. Please contact us for additional guidance if required. 

The surface onto which the material is to be installed should be of adequate strength to bear the construction  of the new surface without deformation. Designers should take into consideration the possibility of any  consolidation, movement or settlement of the foundation design.  

Before laying the material the surface should be free of ice, standing water, snow and loose detritus.  

It‚Äôs recommended to apply a bond coat to the prepared surface to prevent the ingress of water, which can¬† result in ‚Äúplating off‚ÄĚ i.e. where the surface separates from the binder course. Ensuring that the bond coat has¬† cured is vital otherwise bleeding can occur, which will discolour and contaminate the surface.¬†¬†

BituChem produce and strongly recommend the use of a clear vertical joint and edge sealant, which is supplied  in 15/20 litre containers and this should be applied to all raised iron works and kerbs etc.  

Although it is not always practical joints in the new surfacing should be avoided. If unavoidable care and  attention to the laying plan should be given in regards the number and location of any joints.  

Compaction 

When the material has been laid, either by hand or machine, it is recommended to compact the surface as soon as possible. 

Steel wheel, tandem, vibratory rollers are recommended.  

Compaction of the finished surface should be completed above the minimum rolling temp stated in the product¬† datasheet. Continue compacting (polishing) the material until the temperature reaches approx. 60ňöC. (Infrared¬† reading on the surface will show approx. 55ňöC)¬†¬†

(Refer to specific Material Specification Data Sheet for further information.)  

Additional Notes on Installation 

Ideally, it is recommended to complete the scheme in as few visits as possible, to minimize the risk of variation in  appearance.  

If ‚Äúday joints‚ÄĚ are unavoidable, they must be treated on the vertical face with the clear joint edge sealant before¬† additional installation.¬†¬†

Adverse Conditions  

Laying should be avoided if standing water is present or wet weather is forecasted on the day of scheduled  laying.  

NatraTex should not be laid if the ground is frozen. Laying should be suspended if air temperatures fall beneath¬† 0ňöC, or -3ňöC in calm conditions.¬†

Consideration should be given to compaction times if temperatures are falling.  

Thinner layers of material cool quicker and the wind chill can significantly accelerate the cooling process.¬† The material is loaded onto insulated lorries and depending on the size of load (the fuller the lorry, the less heat¬† loss) NatraTex will lose approximately 3-5ňöC per hour whilst travelling.¬†¬†

Installation Contractors  

Reputable contractors with a knowledge and skill set that are able to lay ‚Äúconventional asphalt‚ÄĚ should be able¬† to lay NatraTex. We strongly recommend the use of competent Contractors who are familiar with placement of¬† NatraTex.¬†¬†

For a list of contractors in your area who have installed our products, please call Neil Robinson on 07779 268631,  Fran Smart on 07584 278 836 or our Sales Office on 01594 826768.  

Opening to Traffic  

Depending on weather conditions, product density and use, the opening of the installed surface course to traffic¬† will vary. We recommend leaving the surface at least 12 hours before trafficking. In summer months, when¬† temperatures are high, we‚Äôd suggest leaving the surface overnight, or until the whole course has fully cooled¬† (ideally, to below 30ňöC).¬†¬†

Maintenance & Aftercare  

NatraTex products are very low maintenance, making them ideal for a range of applications and sectors.  

BituChem also produce cold-lay grades of our products, available in 25kg containers, NatraTex Cold Lay, for  use in areas where there has been changes to raised ironworks or small repairs due to bollard replacements or  similar. This material has a 3 month shelf life.  

If hot material is required consideration should be given to quantities & travel time etc. to ensure there’s enough  workable material to complete the works.  

If the finished surface becomes soiled from spillages or debris, it’s recommended to remove these marks using a  citrus cleaner. Avoid using a solvent based cleaner.  

Please Note: Tyre marks and general black marking will be more visible on material produced using clear binder.  However the marking is usually on the binder film that covers the aggregate in early life, and will after trafficking  and weathering become far less evident.  

It is not advisable to place chairs and tables, producing high point loads on any asphalt surface as the surface  will deform particularly in warm weather.  

Quality Control  

NatraTex is manufactured and supplied in accordance with the requirements of BS EN ISO 9001 and the factory¬† process control requirements of BS EN 13108 ‚Äď 21.¬†

Further Information  

BituChem Asphalt Ltd are the manufacturers and suppliers, therefore, any questions which relate to pavement  design should be raised with a suitably qualified person. 

Any further information can be found on our website.