CORROSHIELD® Fasteners METAPP® Crest Fixing Screw
The catalogue positions crest fixing screws for roofing profiles to steel purlins, noting different lengths may be needed based on profile type, insulation blankets, or crest heights.
Specifications
Material: Carbon Steel
Head Type: Hex Washer Flange
Thread: Double thread + ScratchShield™
Drill Point: LEVIN® Drill Point
Drilling Capacity: Max 5.5mm
Washer: Grey EPDM washer
Best-Fit Applications
Crest fixing of profiled roofing sheets to cold rolled purlins
C-purlin / Z-purlin systems
Where METAPP® Crest Fixing Screw is Used?
Use-case:
/1
Fastening profiled metal roofing sheets through the crest (high point) into supporting steel purlins
/2
Roofing systems where elevated fixing enhances drainage performance and reduces direct water exposure at fastening points
/3
Insulated roof assemblies requiring longer fasteners to accommodate insulation blankets, spacer systems, or higher rib profiles
/4
Pre-engineered roofing installations where secure anchorage to cold-formed steel members is essential
ion
ion
/5
Applications demanding strong pull-out resistance and reliable sealing under dynamic wind loads
Best-Fit Substrates:
• Cold-rolled C-purlins
• Cold-rolled Z-purlins
• Light gauge secondary steel framing
Best-Fit Substrates:
• Cold-rolled C-purlins
• Cold-rolled Z-purlins
• Light gauge secondary steel framing
Optional “Common sectors”:
Pre-Engineered Buildings (PEB), Factories, Manufacturing plants, Warehouses, Solar mounting structures, Cold rooms, Food processing plants, Coastal industrial buildings, Airport hangars, Metro stations, Railway platform shelters.
Fastener Types
METAPP®
Crest fixing for profiled roofing sheets to steel purlins ensures strong and accurate fastening at the sheet crest.
The sealed fixing provides enhanced protection against water ingress and environmental exposure.
Engineered for reliable engagement, delivering long-term performance and structural security.
Quality Checks
METAPP® crest fixing screws are subjected to strict quality checks to guarantee secure fastening and weather-tight performance.
Every piece is evaluated for material integrity, precision manufacturing, and durability on the roof.
Steel quality verified for dependable strength.
Heat treatment monitored for uniform hardness.
Thread profile inspected for firm anchorage.
Coating tested to resist corrosion.
Drive and pull-out performance confirmed.
How to Select the Right METAPP® Crest Fixing Screw?
Confirm the roof profile – Select a screw designed for crest fixing to ensure correct positioning and load distribution.
Check purlin thickness – Match the drill point type and screw length with the supporting steel gauge.
Ensure weather sealing – Use EPDM bonded washers to maintain watertight performance at the crest.
Consider environmental exposure – Choose corrosion-resistant coatings suitable for coastal or industrial conditions.
Installation guidance
Choose length based on profile height and any insulation layer.
Drive perpendicular at the specified crest point.
Set washer correctly (sealed, not crushed).
