CORROSHIELD® Fasteners POLYTAPP® Skylight Fixing Screw
When fixing skylights, the fastening point is also the highest risk point — overtightening, sheet damage, and leaks can lead to costly callbacks. POLYTAPP® Skylight Fixing Screws are designed specifically for crest fixing skylight polycarbonate sheets, making them the best screws for polycarbonate roofing where controlled fastening is critical. The screw grinds a pilot hole in the sheet before engaging the steel or timber substrate.
This controlled fixing action supports cleaner installation, better sealing performance, and dependable long-term holding ideal for polycarbonate roofing screws and translucent sheet fasteners used in demanding roofing environments. As reliable polycarbonate fasteners, POLYTAPP® also serves as trusted skylight installation screws for both steel and timber substrates.
This controlled fixing action supports cleaner installation, better sealing performance, and dependable long-term holding ideal for polycarbonate roofing screws and translucent sheet fasteners used in demanding roofing environments. As reliable polycarbonate fasteners, POLYTAPP® also serves as trusted skylight installation screws for both steel and timber substrates.
Specification
Material: Carbon Steel
Head Type: Hex Washer Flange
Thread: Partial Thread with POLYTAPP® Wing
Drill Point: LEVIN® Drill Point
Drilling Capacity: Max 5.5mm steel
Washer: Dome Washer
Fixing Type: Only for Crest Fixing
Best-Fit Applications
Recommended for:
Polycarbonate skylight sheets on metal roofing systems
Fibreglass skylights requiring reliable fixing
Crest fixing applications on roofing profiles using trusted polycarbonate roofing screws
Substrates:
Steel purlins
Timber substrates (POLYTAPP® category is for skylights to steel or timber)
Why POLYTAPP® Outperforms Standard Skylight Fixing Screws
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Pilot-hole forming wing = safer skylight fixing
POLYTAPP® is built with a POLYTAPP® wing that helps create a pilot hole in the skylight sheet — supporting more controlled fastening on brittle or translucent materials. This makes it one of the best screws for polycarbonate roofing where sheet integrity matters.
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Water sealing with dome washer
Supplied with a dome washer to improve weather sealing on skylight crest fixing points and help protect the sheet around the fastener essential for translucent sheet fasteners exposed to the elements.
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Fast installation with reliable drilling
Powered by a LEVIN® Drill Point for faster engagement and smoother drilling performance, reducing installation time for skylight installation screws across large roofing areas.
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Designed to reduce pull-over risk
Engineered for improved pull-over performance important where skylight sheets require stable clamping without damage. Ideal for polycarbonate fasteners and skylight fixing screws in high-wind zones.
Fastener Types
How It Works
Step-by-step fixing concept:
Position the skylight fixing screw on the crest of the polycarbonate skylight sheet.
Allow POLYTAPP® to grind a pilot hole in the skylight sheet, a key advantage of these polycarbonate roofing screws over standard fasteners.
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As the screw continues into the steel substrate, the wings break off and the fastener seats with the washer system for sealing, completing the translucent sheet fastener installation.
Quality & Performance You Can Specify With Confidence
POLYTAPP® is part of a premium fastening system built for demanding construction environments, supported by:
Coating technology developed for corrosion resistance performance requirements aligned to international standards (ASTM / AS / BS / EN as referenced in the catalogue) ensuring every polycarbonate roofing screw meets long-term durability expectations.
In-house QC processes and testing capabilities (hardness, drill tests, corrosion resistance testing, dimensional checks) giving specifiers confidence in these skylight fixing screws across projects.
How to Choose the Right Polycarbonate Roofing Screws for Steel & Timber
Identify the material type – CChoose the POLYTAPP® screw based on the plastic, polycarbonate, or lightweight sheet material being fixed, selecting the correct polycarbonate fasteners for your sheet type.
Select the correct thread design – Ensure the thread profile is suitable to prevent cracking, stripping, or deformation of plastic substrates, critical for reliable skylight installation screws.
Check thickness & fixing depth – Match the screw length to the sheet thickness and support to achieve a secure yet stress-free fixing, especially important for translucent sheet fasteners.
Consider sealing & exposure – Use sealing washers or UV-resistant options for outdoor applications to maintain durability, the hallmark of the best screws for polycarbonate roofing in exposed environments.
POLYTAPP® Skylight Fixing Screws – Installation Guide for Crest Fixing
Use a suitable screw gun and drive perpendicular to the sheet when installing polycarbonate roofing screws.
Fix only at the crest as recommended for skylight fixing screws.
Tighten until the washer is securely seated for sealing — do not overdrive these skylight installation screws.
For steel purlins: ensure substrate thickness supports correct wing break-off action (≥ 1.6mm as noted).
Get Pricing & availability for POLYTAPP®
Frequently asked questions
POLYTAPP® is specified in the catalogue as only for crest fixing. It is not recommended for valley fixing skylight sheets. Always position the skylight fixing screw at the crest of the polycarbonate sheet for correct installation
POLYTAPP® is designed for use with polycarbonate skylight sheets and fibreglass skylights on metal roofing systems. It is one of the best screws for polycarbonate roofing, providing a controlled pilot-hole forming action that protects brittle or translucent sheet materials during installation.
The POLYTAPP® wings are designed to break off once the screw passes through the translucent sheet fastener layer and engages the steel substrate. Wing break-off requires a minimum steel substrate thickness of ≥ 1.6mm. If the substrate is thinner, the wings may not break off cleanly — always verify substrate thickness before specifying.
POLYTAPP® is supplied with a dome washer to improve weather sealing on skylight crest fixing points. The dome washer protects the sheet around the fastener and ensures a reliable seal — an essential feature for polycarbonate fasteners exposed to outdoor conditions.
