23 Aug 2018
ashgrid roofing system

Ashgrid Over-Roofing System

Ashgrid Over-Roofing System

The Ashgrid Over-Roofing System is extremely versatile and is ideal for new buildings and cost saving asbestos roof replacement over-roofing projects. By creating a defined roof cavity we are able to combine various insulation materials to achieve energy efficient roofs that deliver high levels of thermal and acoustic performance.

Minimises building occupants risk and disruption of trade


Legislation stipulates that occupants of a building where asbestos/metal roof sheets are being removed vacate the premises. Leaving the existing roof covering benefits the client by not having to vacate the premises. Consequential damage due to inclement weather & falling debris usually associated with conventional re-roofing are eliminated when over-roofing.

Eliminates rising costs associated with removal & disposal of asbestos

Legislation stipulates that the removal & disposal of asbestos may only be carried out by registered asbestos removal contractors. Removal & disposal costs are high due to safety procedures, transportation & disposal costs.

Labour & time savings

Leaving the existing roof covering in place eliminates the removal phase. This in turn reduces the duration of the project which contributes to significant financial savings.

Improved Health & Safety

The existing asbestos-cement/metal roof sheets remain in place providing us with a platform to work off. The majority of loose asbestos fibres are present between the sidelaps of the existing asbestos-cement roof sheets. These fibres are only at risk of being released when the roof sheets are lifted and removed. Leaving the existing asbestos-cement roof sheets in position eliminates the risk of releasing fibres and exposing the contractor or occupants to contamination.Ashgrid Over-Roofing System

Energy Efficiency

Over-roofing with the Ashgrid Spacer System creates an engineered, structurally defined cavity between the old and new roof coverings. When insulated this cavity dramatically improves the overall energy efficiency of the entire building. With ever increasing electricity prices, energy consumption has become a big concern for most property owners and tenants. Significant financial savings are possible over the life cycle of the new roof covering when insulated appropriately.

Acoustic performance

Creation of an insulated cavity dramatically improves the acoustic performance of a roof. Acoustic performance is imperative when a condusive environment is required in places of learning, libraries, broadcasting facilities, court houses etc.

Environmental benefits

Our landfill sites are filling up at a rapid rate. Over-roofing asbestos-cement roofs prevents further deterioration of the product rendering it inert & safe. Whereas asbestos-cement products that are disposed of in landfill sites continue to degrade due to exposure to the elements. This continued uncontrolled deterioration has a severe impact on our already fragile environment.


Over-roofing incorporates a second layer of roof covering which provides additional security. The majority of commercial break-ins occur through the roof. This additional layer of roof covering provides an extra barrier to deter criminals.

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