CORROSHIELD® Fasteners TIMTAPP® Crest Fixing Screw for Timber
When fastening profiled metal roofing to timber, the fixing needs to bite reliably into wood, seal against weather ingress, and reduce damage along the sheet edge during installation. TIMTAPP® Crest Fixing Screws are designed for crest fixing metal roofing sheets into timber purlins, combining a Hex Washer Flange head, T17 drill point, double thread, and grey EPDM washer for roof-ready performance.
Specification
Material: Carbon Steel
Head Type: Hex Washer Flange
Thread: Double thread, ScratchShield™
Drill Point: T17 Drill Point
Drilling/Embedment Requirement: Min embedment 25mm timber
Washer Type: Grey EPDM Washer (Ø 16mm in the listed range)
Best-Fit Applications
Ideal for:
Crest fixing of metal roofing sheets
Timber construction roofing assemblies
Substrate:
Timber purlins (minimum embedment requirement applies)
Key Features & Benefits
/1
Grey EPDM washer for reliable sealing
Helps provide a weather sealing interface at the fixing point—important for crest fixing on roofing profiles.
/2
T17 drill point for timber engagement
Designed for timber use, with installation requirement of minimum 25mm embedment into timber.
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Double thread + ScratchShield™
TIMTAPP® features double thread and ScratchShield™ shank protection, supporting installation performance and helping smooth sharp sheet edges during fixing.
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Hex Washer Flange head
Hex head provides secure drive engagement and the flange supports stable seating on roofing sheets.
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RAL Color Matched (available)
Suitable where matching the roof profile colour is required (as indicated in the brochure feature icons).
Quality, Testing & Assurance
TIMTAPP® is supported by the catalogue’s manufacturing and QC system, including:
In-process quality inspections across production stages
Testing facilities such as corrosion resistance testing, hardness testing, drill testing, PMI, and dimensional/profile checks
Coating options designed to meet corrosion resistance performance requirements aligned to international standards (ASTM / AS / BS / EN referenced in the brochure)
How to Select the Right TIMTAPP® Screw?
Identify the timber type – Choose the TIMTAPP® screw based on whether the fixing is into softwood, hardwood, or engineered timber.
Select the correct thread design – Ensure the thread profile provides strong holding power and minimizes splitting of timber.
Match length & diameter – Pick the appropriate screw size according to timber thickness and required embedment depth.
Consider environment & finish – Opt for suitable coatings or finishes for indoor, outdoor, or moisture-prone applications to ensure durability.
Installation guidelines (best practices)
Select length based on roof profile height, sheet build-up, and required timber engagement (ensure minimum 25mm embedment into timber).
Crest fix perpendicular to the sheet for consistent sealing and load distribution.
Set the EPDM washer correctly—secure underhead seating; do not under-drive or over-drive (aligned with the brochure’s washer setting recommendations).
Get Pricing & availability for TIMTAPP®
Frequently asked questions
TIMTAPP® is specified for fixing metal roofing sheets to timber purlins (crest fixing).
The catalogue specifies minimum embedment of 25mm into timber.
Yes—TIMTAPP® is supplied with a grey EPDM washer (Ø 16mm in the listed sizes).
The brochure lists 5.5 (12g) diameter in 55, 65, 75, and 90mm lengths with clamp thickness ranges as shown above.
