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Foilboard Flexifast Fasteners


Actual Area (sq m)
Total Price

Foilboard Flexifast Fasteners

Flexifast Fastener is not only fast and extremely flexible in its use, but also adjustable, making it the perfect solution for many applications.Foilboard Flexifast can be used to insulate existing structures or new projects. Foilboard® Flexifast allows all Foilboard® products to be installed in underfloors, walls and ceilings. Simply cut Foilboard to desired size, insert Flexifast into the Foilboard®. Gently push between framework and fix. Flexifast should be installed at 600mm centres. All joins should be taped for maximum performance.

Suitable for all applications

Foilboard Australia Pty Ltd manufactures a range of fixing accessories tailored to suit many construction applications. These Foilboard timber fasteners ensure that the material will be installed correctly and maintain its thermal performance for the life of the application. Whether it is for timber or steel frame construction, underfloor applications and even commercial systems, Foilboard® has the right fixings to suit all applications.

Foilboard Flexifast Fastener Installation Instructions

1. Push the Foilboard Flexifast ® fastener into the desired position in your Foilboard® sheet, using the specially
designed prongs, and then position the board where it is required.
2. Fasten the Flexifast® fastener with either nails or screws where appropriate.
3. Foilboard® recommends the use of 1 Flexifast® fastener every 600mm for maximum stability.
4. To finish the perfect installation of Foilboard®, all sheets must be taped where they
join to prevent air infiltration, therefore maintaining your desired R-Value.

Instructions are a guideline only and should be interpreted with consideration for the specific building application. Safe installation practices are encouraged at all times.

Method of Calculating Quantities of Foilboard

  • Measure Floor or Wall area.
  • Add 5% to area to allow for cutting and waste, deduct window and door openings.
  • If using 2.44m sheets divide the area by 2.93 to give the number of sheets required.
  • If using 2.70m sheets divide the area by 3.24 to give the number of sheets required.
  • Round up to the next full sheet.
  • Floor saddles should be on joists at approx 600mm centres and spaced at 200mm from sheet ends.
  • For retro-fits Foilboard should span across the underside of joists and between bearers using three Foilboard fasteners per joist. Joins do not need to be made on a joist and you should tape all joins.
  • Generally 1 bag of saddles is required for every 45-50m2 and 1 Role of Green Tape will be required for every 100m2. For retro-fits you will generally require 1 bag of Foilboard Fasteners and 1 roll of Green Tape for every 15-20 sheets, for Aluminium tape you will require one roll for every 10-12  sheets approx. Flexifastners should be used for all sheets 25mm or thicker and you will require 1 bag of 200 fastners for every 15-20 sheets. Or for sheets over 25mm in thickness you can order the plastic plates and supply your own fixing nails or screws. Spacers for brick work you will require 8-10 spacers per m2

Residential Wall

For example, an area of 130m2 (residential wall – timber/steel frame excluding windows) will require;

  • 45 sheets of Foilboard® Insulation Panel (2440mm x 1200mm, 2.93m2 per sheet)
  • 3 bags of fasteners (Standard or Ultra or Flexifast)
  • 3 Rolls of Green UV PVC Tape

Underfloor Area

For traditional underfloor applications using timber joists at 450mm centres (130m2);

  • 45 sheets of Foilboard® Insulation Panel (2440mm x 1200mm, 2.93m2 per sheet)
  • 3 bags of Foilboard® Floor Saddles or Flexifast Fasteners
  • 3 Rolls of Green UV PVC Tape

Data Sheet

Information Brochure       Technical Brochure

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Dear Valued Customer,

Thank you for visiting Oz Homes Insulation, we will finish trading for the year at 5:00pm Monday 18th December 2023 and re-open for business on Monday 15ndJanuary 2024

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