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Design

For today’s specifier, balancing roofing performance and aesthetic expectations against regulatory and budgetary restrictions has never been more of a challenge.

Our experienced team of Technical Advisers thrive on complex building envelope challenges. They can help steer a course through the ever changing landscape of Part L of the Building regulations with Sarnafil’s accredited details, thermally modelled by the BRE – as well as providing detailed application knowledge of single ply roofing systems.

Specification considerations

• Does the roof contribute towards sustainable construction?
• Will the roof design enable compliance with the building regulations Part L?
• How visible is the roof? Are aesthetics important?
• Does the supporting structure place weight restrictions on the roof?
• How can the roof be drained most effectively?
• Are cool roofs or green roofs a consideration?
• What level of guarantee is required, for example should wind uplift calculations and attachment method be covered?
• How do rooflights and health and safety considerations affect the specification

Which roofing system is most suitable for your project?

Sarnafil roofing systems fall into four broad categories: mechanically fastened, adhered, ballasted and green roofs. Within these different roof types there are a number of options to suit almost every kind of construction and design requirement.

Sarnafast Mechanically Fastened System
The Sarnafast System offers speed, security and economy of installation in applications which provide regular fixing centres, including profiled steel decks. Ideal for applications with the following criteria:

• Location subject to high winds
• Large roof area
• Fastrack installation requirement
• Impracticality of adhered attachment

Sarnabar Mechanically Fastened System
The Sarnabar System features linear fastening bars which are attached at right angles to the direction of the membrane. This versatile system is ideal for use when fixing points are dictated by existing timber joists or channel reinforcement, or for use on concrete roofs where the Sarnafast system is less practical. Ideal for applications with the following criteria:

• Location subject to very high winds
• Concrete Deck
• Irregular or bespoke design
• Impracticality of adhered or Sarnafast attachment

Sarnafil Adhered Systems
These fall into two categories. Adhered Systems, in which all elements within the roof build-up above the deck are adhered to each other; and Composite Adhered Systems in which the membrane is adhered to a thermal insulation board that is mechanically fastened to the structural deck. Suitable for applications with the following criteria:

• Superior aesthetics
• Reduced noise during installation
• Impracticality of mechanical fastening
• High humidity in building below
• Complex roof shapes

Sarnafil Ballasted Systems
This broad range of roofing solutions is characterised by an additional top layer of stone ballast or concrete pavers which secure the loose-laid waterproofing membrane. Ballasted roofs can be of either warm roof construction (shown above), or inverted construction with moisture resistant insulation. Sarnafil Ballasted Systems are typically chosen for the following reasons:

• Fire requirement
• Access and amenity
• Protection
• Acoustics
• Rain noise reduction

SarnaVert Green Roof Systems
These are ballasted roofs in which the ballast provides a planting medium. Green Roof Systems are popular for a variety of reasons:

• Adaptation of building to its environment
• Pleasing aesthetics
• Reduced load on drainage
• Provision of habitat for wildlife
• Improvements in local climate – heat reflection, solar radiation absorption, oxygenation and increased humidity
• Extended waterproofing life
• Additional energy saving
• Improved sound insulation

Key to diagrams:

1. Sarnafil membrane
2. SarnaTherm insulation
3. Sarnavap vapour control layer
4. Structural deck
5. S-Felt or protection sheet
6. Ballast
7. AquaDrain
8. Moisture retention fleece
9. Growing medium & Planting

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