CORROSHIELD® Fasteners METAPP® Valley Fixing Screw
Hex washer head screws are positioned as self-piercing screws with a built-in washer at the head, providing load distribution and torque resistance. Catalogue calls out the bonded washer advantage.
Specifications
Material: Carbon Steel
Head Type: Hex Washer Flange
Thread: Full Thread
Drill Point: LEVIN® Drill Point
Drilling Capacity: Max 5.5mm
Washer: Grey EPDM Washer
Best-Fit Applications
Fixing metal roofing sheets into steel purlin
Valley fixing contexts
Where METAPP® Valley Fixing Screw with flange is Used?
Use-case:
/1
Direct fastening of metal roofing and wall cladding sheets through the valley (low point) into supporting steel members for secure sheet anchorage.
/2
Fixing corrugated and trapezoidal / box rib profiles to light-gauge steel framing systems.
/3
Wall and side cladding installations where uniform load transfer and close sheet-to-frame contact are required
/4
Applications requiring wide bearing surface under the head (flange) for improved pull-through resistance and sheet stability
/5
Installations where controlled perpendicular driving ensures optimal sealing performance and minimizes water ingress.
Best-Fit Substrates:
• C-Purlins and Z-Purlins
• Light structural steel framing
• Secondary steel members in pre-engineered buildings
Best-Fit Substrates:
• C-Purlins and Z-Purlins
• Light structural steel framing
• Secondary steel members in pre-engineered buildings
Optional “Common sectors”:
EPDM sealing with a hex washer Flange ensures a tight, weatherproof connection. It provides secure assembly of roofing sheets onto steel frames with consistent clamping force. Designed to enhance durability, leak resistance, and long-term roofing performance.
Quality Checks
METAPP® valley flange fasteners are subjected to stringent quality checks to ensure firm seating and leak-proof reliability.
Material strength, dimensional precision, and corrosion resistance are verified for long-term roofing performance.
Steel quality validated for dependable strength.
Flange dimensions inspected for accurate fit.
Thread profile checked for secure anchorage.
Protective coating tested against corrosion.
Torque and pull-out performance confirmed.
How to Select the Right METAPP® Valley Fixing Screw?
Confirm roof profile compatibility – Choose a flange shape that fits correctly into the sheet valley for stable seating.
Check load distribution needs – Ensure the flange provides adequate bearing area to prevent sheet deformation.
Verify sealing support – Use designs that work effectively with sealing washers for watertight fixing.
Consider environmental exposure – Select corrosion-resistant materials or coatings for long-term durability.
Installation guidance
Drive perpendicular through sheet into steel.
Tighten until bonded washer seals uniformly.
Avoid under/over-driving to maintain weather seal.
