ONDULINE OVERSHEETING SYSTEM

Roof covering renewal - the case for oversheeting.

  With the problem of renewing an old, deteriorating corrugated roof, there are two options available - to remove and replace the old roof covering or to oversheet

Before you decide, you will need to take account of a number of design, cost and environmental considerations such as :-

2/. Choice of replacement roofing materials to be used.

3/. The complexity of the roof including protrusions such as rooflights, soil and flue pipes etc.

4/. Matching the fixing and spanning characteristics of the new roof covering to the existing roof structure.

5/. Ability of the existing roof structure to take the additional weight involved in oversheeting.

6/. Upgrading of thermal and sound insulation

7/. Health risks in handling and disposal of existing hazardous roofing materials (particularly asbestos), in accordance with Health and Safety Regulations.

8/. Economics.

9/. Provision of roof underlining.

     The use of Onduline Oversheeting System in the majority of cases satisfies these design considerations, demonstrating significant benefits over replacement, in terms of both economic and practical design criteria.

The Onduline Oversheeting System has been developed with the benefit of our extensive world-wide experience. It is an adaptable system that is ideal suited to a wide variety of roof construction types.

The system utilises Onduline corrugated roofing sheets, developed for over 50 years and now sold in over 90 countries world-wide.

Onduline provides an extremely tough. flexible, lightweight roof covering that is virtually indestructible but very easy to fix, even to curved roofs. All this together with its comparatively low cost combine to make Onduline the ideal oversheeting material.

Onduline is made by saturating organic fibres with bitumen under intense pressure and heat. It contains no asbestos and presents no health hazard.

Onduline is available in four attractive colours, with colour stability ensured by a unique pigmentation process which "stains" the colour into the sheet. Onduline is covered by a 15 year insurance backed weatherproof guarantee. It also has BBA product certification.

• Low Cost
• Reduced health risk in handling and disposing of hazardous roof coverings
• Virtually maintenance-free.
• Improved thermal and sound insulation.
• Reduced risk of condensation.
• Simple and quick installation.
• Onduline has BBA Certification.
• 15 year insurance- backed weather-proof guarantee.

A demonstration of the cost-effectiveness of the Onduline Oversheeting System

An Ondutiss vapour barrier should be fixed below the insulation and ventilation provided above the insulation. For metal roof applications insulation should be incorporated to avoid problems created by the transfer of solar heat into the roof space of the building.