CORROSHIELD® Fasteners METAPP® Retrofit Screw
Retrofit screws are positioned for construction/repair reinforcement or replacement use cases in roofing and metal structures.
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 washe
Best-Fit Applications
Roofing retrofit and replacement fixing points
Steel purlins and valley/wall-roof contexts
Where METAPP® Retrofit Screw is Used?
Use-case:
/1
Reinforcing existing metal roofing sheets during repair, strengthening, or life-extension projects
/2
Replacement fastening in aging roofing systems where original fasteners have loosened, corroded, or failed
/3
Over-sheeting and roof refurbishment works where new sheets are installed over existing metal roofing
/4
Upgrading fixing points to improve wind uplift resistance and restore structural stability
/5
Maintenance applications in wall cladding and roof-to-purlin connections requiring secure re-anchoring
Best-Fit Substrates:
• Cold-formed C-purlins
• Cold-formed Z-purlins
• Existing steel roof framing members
• Valley and wall-roof junction fastening points
Best-Fit Substrates:
• Cold-formed C-purlins
• Cold-formed Z-purlins
• Existing steel roof framing members
• Valley and wall-roof junction fastening points
Optional “Common sectors”:
Industrial roofing refurbishment projects, warehouses, factories, commercial buildings, logistics facilities, agricultural sheds, and infrastructure rehabilitation works.
Fastener Types
METAPP®
Retrofitting and replacement screw solutions are designed for efficient upgrades in existing roofing systems.
They provide sealed, stable fixing to restore performance and prevent leaks over time.
Ideal for maintenance and refurbishment projects requiring reliability and long-term durability.
Quality Checks
METAPP® retrofit screws are validated through rigorous inspections to ensure dependable performance in replacement and repair work.
Strength, fit, and corrosion protection are carefully checked for long service life.
Steel grade assessed for reliable tensile strength.
Heat treatment controlled for proper hardness.
Thread design inspected for secure re-fastening.
Protective coating verified for corrosion resistance.
Torque and pull-out capability tested.
How to Select the Right METAPP® Retrofit Screw?
Assess the existing structure – Choose the screw compatible with current roofing sheets and support members.
Check penetration needs – Select the right drill point and length to anchor securely through old materials.
Ensure sealing efficiency – Use EPDM washers to maintain watertight performance during replacement.
Consider service environment – Opt for high corrosion resistance for long-term durability in exposed conditions.
Installation guidance
Correct installation improves water-tightness and long-term performance.
2 callouts
Remove failed/compromised fasteners and prepare the fixing point as required.
Drive perpendicular, set washer correctly, avoid overdriving.
