Adhered Systems

Adhered Systems are typically specified for small to medium sized roofs.

For economical reasons, adhered roofing systems are suited to new or refurbishment projects, projects with a high aesthetic requirement and the reproduction of the appearance of traditional systems, such as Lead and Copper.

Other typical reasons for the selection of a adhered system include:
• Difficult access (such as inner city environments), where the Combination Adhered system excels.
• Projects that are overlooked, where the aesthetics are a benefit.
• Projects with a high internal humidity (such as swimming pools and laundries), where fastened penetrations are undesirable.
• Projects that have a decorative underside, where fastened penetrations are undesirable.
• Concrete substrates, where the noise caused by drilling is not acceptable (particularly in refurbishment), or the time taken is unacceptable to the programme.
• Substrates, where it is difficult to achieve a suitable mechanical fastening.

Types of System

Adhered systems can be specified as either a combination adhered system with mechanically fastened insulation and adhered membrane, or a fully adhered system with all elements fully adhered together. Regardless of the adhered system chosen, it will typically consist of the following:
• A structural deck
• Vapour control layer
• Thermal insulation
• Sarnafil G410-EL, Sarnafil G410-ELF or Sarnafil TG76-Felt membrane

Mechanically Fastened Systems

Mechanically fastened systems are suitable for both new and refurbishment projects of any size.
They are ideally suited to projects where wind uplift is high, fast installation is required or the attachment of the existing roofing system is unsatisfactory.

Other reasons for the selection of mechanically fastened systems include:
• Difficult access, such as inner city environments
• Where hot works are not permitted
• Where speed of application is critical to the programme
• Where an unusual roof design is required, a situation where the Sarnabar system excels

Types of System

Sarnafil roofing systems can be mechanically fastened using one of two different systems:
1. The Sarnabar system
2. The Sarnafast system

Both systems will typically consist of:
• A structural deck
• Vapour control layer
• Thermal insulation
• Sarnafil S327-EL or Sarnafil TS77-E membrane
In all cases, the number of fasteners required for the attachment of the system will be determined by the wind load calculation produced by Sarnafil Ltd, in accordance with the local regulations.

Loose Laid Ballasted Systems

Loose Laid Ballasted systems are typically used on small to medium sized roofs for aesthetic reasons.

The ballast consists of either round washed stone or a roof greening system, such as SarnaVert. Pedestrian systems, such as paving and timber decking, are sometimes referred to as ballasted systems.

Types of System

There are two principle types of ballasted roof construction:
1. Warm ballasted
2. Inverted ballasted

SarnaVert Green Roofing Systems

The use of plants or greening can be dated back to the Hanging Gardens of Babylon (circa 550BC).

This is a typical example of this type of roofing being used for aesthetic reasons. More recently, green roofs have been used for both aesthetic and environmental reasons, with the green roof replacing the green ‘footprint’ lost by the erection of the building. Today, the significant contributions of green roof to Sustainable Drainage systems are increasingly being recognised. In Germany, in excess of 80 million m² of green roofing have been installed.

Green roofing systems are principally divided into three main categories:
1. Biodiverse
2. Extensive
3. Intensive
The SarnaVert system provides all of these options, but also enables the specification of hybrid systems to suit the local environment and design requirements.

Beneath any of these roof greening options Sarnafil recommend the use of a warm ballasted system, as this reduces the insulation thickness and effectively controls vapour diffusion. This is critical in a roofing system that will always contain moisture above the primary waterproofing membrane.

A typically warm ballasted SarnaVert green roof construction will consist of:
• A structural deck
• High performance vapour control layer
• Thermal insulation
• Sarnafil G476-20TEX or Sarnafil TG66 membrane
Between the primary Sarnafil waterproofing membrane and the chosen greening system, Sarnafil AquaDrain drainage and protection layer will be installed prior to the installation of a growing medium and planting.