PolyFast Crest Fixing Fasteners – For Timber Battens
For fixing all types of plastic glazing materials to treated timber battens.
Suitable Plastic Glazing Materials:
Polycarbonate, Acrylic (PMMA), FRP, UPVC, PVC and more.
Coating: AS 3566 Class 3
TPI: 11 threads per inch.
Suitable for use with #12 (5/16”) Drive.
50mm Length for all Hardwood and Softwood Timbers
7.9mm (5/16″) Hex Washer Flanged Head.
Suitable for use at a drill speed of 1000rpm.
POLYFAST – Crest Fixing Plastic Skylight Timber Fasteners
Due to the high Coefficient of Linear Thermal Expansion (CLTE) of polycarbonate, 65~70 x 10–6 m/k, the rate of expansion due to thermal changes must be considered when calculating the size required, and enough room must be left for these changes during installation.
A 3-meter-long sheet of polycarbonate for example will expand by approximately 2.1mm for each 10°C temperature increase. A 5-meter-long sheet restrained at one end by being butted up against a brick wall can have its free end move by over 10mm in the course of a day with a 30°C temperature rise.
Before the introduction of fasteners dedicated to fixing thermoplastics, and when metal fixing hex washer screws were still used, fixing any plastic sheets required at least 2 steps. First, pre-drilling an expansion hole that is approx. 2 times the diameter of the screw using a standard drill bit, which is followed by screwing down the metal roofing screw.
More often than not, builders will skip the first step and drill through the metal roofing screw directly, which is like a ticking time bomb waiting to explode, because sooner or later, the sheets are bound to deform, craze, crack, and break all the way through.
VULCAN Plastics, in collaboration with BDN Fasteners, have come up with PolyFast, a polycarbonate screw with a hassle free, fail safe design, and literally the easiest to use skylight fixing fastener on the market.
PolyFast Crest Fixing Fasteners can be used on all kinds of plastic glazing material and especially effective when used as polycarbonate roofing screws, with its length designed to accommodate the crest height of VULCAN ROMA and GRECA profiles.
The attached round cutting saw creates a much-required 10mm diameter thermal expansion hole on plastic roofing materials which then securely fastens onto the purlin underneath in one-go.
A large domed BAZ washer completes the package, covering the expansion hole while providing superior strength against high winds.
BDN FASTENERS Polycarbonate Skylight Screws
#12×2″(12-11x50mm), Hex Flange Head, Self-Tapping Screws for Timber, 50pcs
Detailed Product Specifications
POLYFAST Crest Fixing Self-Drilling Fastener to Timber Battens
Features: (5/16′) Hex washer flanged head T17 Timber fastener with expansion hole cutting saw and large dome EPDM washer. 50mm length fit for use on all hardwood and softwood timbers.
Spec: #12-11 x 50mm
Where Used: Corrugated Polycarbonate sheets, mainly at the crest of the corrugations when on roofing skylights.
Coating: AS 3566 Class 3. Weathering resistant Ruspert coating
Suitable for use with treated timber
Hex Washer Flanged Head Size: Suitable for use with 5/16” Drive (#12)
