D-marc Demarcation System

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D-marc has concentrated on designing, manufacturing and marketing performance demarcation systems that give specifiers the confidence of knowing the system has been tested to withstand some of the harshest weather conditions experienced. The performance has been coupled with sustainability, ease of use and practical installation considerations to ensure a product of outstanding quality that is fit for purpose and looks good.

The Ideal Rooftop Demarcation System

The D-marc™ 105 has been wind tunnel tested to withstand wind speeds of up to 105 mph by the BRE and has a patent pending application No. 0802613.0. The stability of the system is due to the unique design of its base and upright which eliminates any potential oscillation—a cause of roof surface damage with traditional systems.

The Upright

The lattice structure ensures the wind circulates around and through the system rather than pushing it over.
Its three connecting pins do not protrude through the base and therefore do not come into contact with the roof structure ensuring it cannot damage the roof even if it begins to oscillate.
It has a non-protruding integral hook incorporated inside the lattice structure which ensures the chain cannot lift off the upright in high winds.

The Base

The trapezoid base shape is aerodynamically designed with four pyramidal sloped sides at 30° which, in extensive wind tunnel testing was shown to be the most stable shape.
The underside of the base is sculpted ensuring the weight is distributed to its perimeter, minimising the effect of wind uplift.

Legislation

D-marc 105™ is classed as a form of Collective Protection in accordance with the HSE’s hierarchy of risk management as set out within the Working at Height Regulations 2005 (WAHR). The WAHR 2005 Part 3 illustrate the use of a demarcation system as an “example of taking other additional suitable and sufficient measures to prevent a fall” The demarcation system to placed a safe distance from the fall hazard (normally 2 m).

Health and Safety in Roofwork HSG33 states that 'where work is not done at the edge, demarcation barriers can be provided at a safe distance from the edge. (usually at least 2 meters). Eg work on an air conditioning unit in the middle of a roof.'

Areas of Use

D-marc™ 105 provides a demarcation system for flat rooftops. Applications may be for the purpose of preventing access to hazards during regular rooftop maintenance or to provide safe access across the roof. Wherever roof access is required designers are tasked with creating a safe route which should be identified by a demarcation system.

D-marc™ 105 has been wind tunnel tested on single ply, bituminous and concrete roof surfaces resisting wind speeds in excess of 105 mph.

A system to provide a safe route to/from an access stair.

A system to provide a safe area for regular maintenance.

Installation

The system requires no specific training to install, the upright is slotted into the base and the chain is then placed on the hook on the upright and linked to the next section of chain with the chain link supplied.

There are no specific components for corners or curves, the system can follow the demarcation zone as indicated with the posts being placed at 3 m intervals.