Retrofit Screw —Self Drilling Roofing & Structural Fasteners
METAPP® Retrofit Screws are high-performance self drilling roofing screws positioned for construction, repair reinforcement, or replacement use cases in roofing and metal structures. As dependable metal roofing screws and roofing fasteners, they are engineered to anchor securely through aged or existing sheet materials — where standard fasteners may no longer hold.
Whether specified as self drilling screws for over-sheeting work, as corrosion resistant fasteners for long-term durability in exposed environments, or as structural fasteners for restoring wind uplift resistance, METAPP® Retrofit Screws deliver consistent re-fastening performance across industrial and commercial roofing projects.
Whether specified as self drilling screws for over-sheeting work, as corrosion resistant fasteners for long-term durability in exposed environments, or as structural fasteners for restoring wind uplift resistance, METAPP® Retrofit Screws deliver consistent re-fastening performance across industrial and commercial roofing projects.
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
Self Drilling Roofing Screws, Metal Roofing Screws, Roofing Fasteners
Steel purlins and valley/wall-roof contexts
Self Drilling Screws, Structural Fasteners, Corrosion Resistant Fasteners
Where METAPP® Retrofit Screw is Used?
Use-case:
/1
Reinforcing existing metal roofing sheets during repair, strengthening, or life-extension projects — the primary role of self drilling roofing screws and metal roofing screws in retrofit work.
/2
Replacement fastening in aging roofing systems where original fasteners have loosened, corroded, or failed — requiring reliable roofing fasteners and corrosion resistant fasteners for secure re-anchoring.
/3
Over-sheeting and roof refurbishment works where new sheets are installed over existing metal roofing — where self drilling screws must penetrate multiple layers cleanly without pre-drilling.
/4
Upgrading fixing points to improve wind uplift resistance and restore structural stability — the standard for structural fasteners and self drilling roofing screws in roofing refurbishment.
/5
Maintenance applications in wall cladding and roof-to-purlin connections requiring secure re-anchoring — where metal roofing screws and roofing fasteners must perform dependably in aged structures.
Best-Fit Substrates
- Cold-formed C-purlins — for self drilling roofing screws
- Cold-formed Z-purlins — for metal roofing screws
- Existing steel roof framing members
- Valley and wall-roof junction fastening points — for structural fasteners
Optional “Common sectors”:
- Industrial roofing refurbishment projects — self drilling screws
- Warehouses & factories
- Commercial buildings & logistics facilities — corrosion resistant fasteners
- Agricultural sheds & 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. As precision-engineered self drilling roofing screws and structural fasteners, strength, fit, and corrosion protection are carefully checked for long service life.
Steel grade assessed for reliable tensile strength — essential for metal roofing screws in retrofit applications.
Heat treatment controlled for proper hardness — ensuring self drilling screws penetrate aged materials cleanly.
Thread design inspected for secure re-fastening — the standard for reliable roofing fasteners in repair work.
How to Select the Right METAPP® Retrofit Screw?
Assess the existing structure – Choose the screw compatible with current roofing sheets and support members — selecting the right self drilling roofing screws and metal roofing screws for the existing profile and substrate.
Check penetration needs – Select the right drill point and length to anchor securely through old materials — critical for self drilling screws and roofing fasteners used in over-sheeting and repair applications..
Quality Checks
Protective coating verified for corrosion resistance — critical for corrosion resistant fasteners in exposed roofing environments.
Torque and pull-out capability tested — confirming METAPP® meets the highest standards for structural fasteners in refurbishment.
Dimensional precision checked across all self drilling roofing screws variants for correct fit with existing profiles.
How to Select the Right METAPP® Retrofit Screw?
Ensure sealing efficiency – Use EPDM washers to maintain watertight performance during replacement — essential for structural fasteners and metal roofing screws where weather sealing must be restored.
Consider service environment – Opt for high corrosion resistance for long-term durability in exposed conditions — the standard for corrosion resistant fasteners and roofing fasteners in coastal or industrial environments.
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.
