Glossary

DENSE (CLOSE) GRADED

DENSE (CLOSE) GRADED
Dense macadam contains a significant proportion of fines (material of 3mm or less). This means it is often classed as an impermeable material.

EPDM

EPDM
Ethylene Propylene Diene Modified (EPDM) is specifically manufacturered rubber. The granules form the wearing course of the surface. When used in the two layer system this wearing course is laid at a depth of 15mm. Rubber granules between 1mm and 4mm form a hard wearing, porous and slip resistance layer.

FLAME RETARDENT

FLAME RETARDENT
A substance that prevents or inhibits the outbreak of fire.

FLAMMABILITY

FLAMMABILITY
Flammability is the ability of a substance to burn or ignite, causing fire or combustion.

FREE FALL HEIGHT

FREE FALL HEIGHT
The greatest vertical distance between any accessible parts of the equipment intended for play and the surface beneath

GEOTEXTILE MEMBRANE

GEOTEXTILE MEMBRANE
Permeable fabrics which are laid above the soil in order to separate material from the surface below.

JOINTS

JOINTS
Where a continuous surface installation is interrupted, such as where a Bonded Mulch surface is joined to Wetpour without the installation of an edge detail.

LAID TO FALLS

LAID TO FALLS
When paving is laid on a slight slope to prevent standing water.

MACADAM

MACADAM
A surface made of compressed layers of small broken stones, bound together with tar or asphalt.

MOT TYPE 1 (DOT TYPE 1) – RECOMMENDED FOR USE

MOT TYPE 1 (DOT TYPE 1) – RECOMMENDED FOR USE
A permeable sub-base that is formed using recycled crushed concrete and consists of rubble of varying size, from 40mm to dust. It compacts well to form a solid base which works well for permeable surfaces such as Wetpour and Mulch.

MOT TYPE 3 (DOT TYPE 3) – NOT RECOMMENDED FOR USE

MOT TYPE 3 (DOT TYPE 3) – NOT RECOMMENDED FOR USE
A crushed and graded material, such as granite, whinstone or concrete that has been screeded to create an open, reduced fines aggregate. Type 3 is also permeable. However, the rock type is very large. This means that more regulating is required onsite.

MUGA TYPE 5

MUGA TYPE 5
Artificial grass areas (MUGAs or AGPs) with a shockpad and either heavily doused with water before play or dressed with sand or rubber crumb. These areas are used for sports such as hockey, five-a-side football, football, lacrosse, American football and training for activities such as athletics, rugby union and rugby league.

NO FINES CONCRETE

NO FINES CONCRETE
No fines concrete drains in the same way as open textured macadam. This is mixed on-site from clean, course, single sized aggregate and cement.

NON POROUS

NON POROUS
Does not contain minute spaces which allow water to pass through.
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