Sika Sarnafil prefers to provide specifications based on our own Standard Paragraphs, as they are updated more regularly than NBS Clauses and enable the specification to be written in a more detailed defined manner. Where an NBS specification is requested, Sika Sarnafil recommends the Sarnafil specification is attached to the NBS as an appendix.

Every Sika Sarnafil specification is unique and given its own unique Project Record Number, a number that stays with the project from specification, through order and all the way to sign off for final guarantee.

Sarnafil Specifications

Whatever specification format is used, Sika Sarnafil recommends that they are read carefully by all parties, as they are always project specific and every project is slightly different.

Each specification provides important tender information, which if missed or ignored, can prove costly to correct later. Key areas we would recommend close attention to are:

  • Guarantee type and period
  • Membrane grade and colour
  • Any pullout test requirements on the substrate
  • Substrate type (and assumptions)
  • Preparation of substrate
  • Sarnafil branded products required e.g. SarnaTherm insulation, for a Sarnafil Extended Product Guarantee
  • Insulation fixing recommendations (where required)
  • Insulation generic type, uniform or tapered (where required)
  • Membrane fixing recommendations (and assumptions)

NBS Specifications

As a member of the RIBA NBS Plus service since 1998, we can provide the client with a bespoke NBS format Sarnafil specification for any project. When providing NBS format specifications we will always provide an accompanying Sarnafil specification, as this enables a more detailed project specific specification to be prepared.

Sika Sarnafil recommends that when tendering using an NBS specification, a number of key details are checked in the Sarnafil specification, such as:   

  • The Sarnafil Project Record Number   
  • Guarantee type and period  
  • Membrane grade and colour   
  • Any pullout test requirements on the substrate   
  • Substrate type (and assumptions)   
  • Preparation of substrate   
  • Sarnafil branded products required e.g. SarnaTherm insulation, for a Sarnafil Extended Product Guarantee   
  • Insulation fixing recommendations (where required)   
  • Insulation generic type, uniform or tapered (where required)  
  • Membrane fixing recommendations (and assumptions)

Request a Bespoke Specification

To request a bespoke specification for a roof refurbishment project, please complete the form below and a member of our team will be back in touch as soon as possible.