Home » Roofing Screws »
Premium Screws for Wood to Metal Roofing & Cladding Connections
When installing metal roofing sheets, flashings, or cladding profiles over a residential or commercial timber framework (such as wood purlins, battens, or trusses), selecting the correct fastener is critical. Because steel panels and timber substrates expand and contract at completely different rates under intense weather conditions, standard generic screws will quickly loosen, split the wood, or cause catastrophic water leaks.
If you are searching for a high-performance screw for wood to metal roofing applications, BDN Fasteners designs and manufactures industrial-grade self-tapping and self-drilling screws engineered specifically to secure metal sheet profiles to underlying wood structures seamlessly.
Why BDN Metal-to-Wood Roof Fasteners Excel
Our roofing fasteners are purpose-built to address the exact engineering challenges faced by contractors when attaching metal sheets to timber frameworks:
-
Type 17 Sharp Slotted Point (Timber Thread): Instead of a standard metal drill tip, these screws feature a specialized, sharp scalloped point that acts like a miniature wood drill bit. It cleanly clears wood fibers as it drives, allowing for exceptionally rapid installation into wood purlins while eliminating the risk of splitting the timber framing.
-
Integrated EPDM Washers: Our Hex Washer Head (HWH) configurations come equipped with a premium, UV-resistant EPDM rubber washer. Upon driving, it forms a permanent, flexible, and completely watertight seal that seals the metal sheet entry point against heavy driving rains.
-
AS3566 Class 3 & Class 4 Protection: Manufactured in strict compliance with the rigorous Australian Standard AS3566, our multi-layer premium coatings provide elite protection against atmospheric rust and galvanic corrosion, easily outperforming standard commercial hardware store screws.
| BDN Actual Code | Screw Size (Gauge x TPI) | Length (mm / inches) | Thread Type | Specific Roofing Applications |
| T17H1020C3N | Gauge 10 – 11 | 25mm (approx. 1″) | Type 17 Timber Thread | Valley-fixing thin steel roof sheets or flashings to wood battens |
| T17HCG1250C3N | Gauge 12 – 11 | 50mm (approx. 2″) | Type 17 Timber Thread | Standard corrugated metal roofing panels into residential timber trusses |
| T17HCG1265C3N | Gauge 12 – 11 | 65mm (approx. 2-1/2″) | Type 17 Timber Thread | Crest-fixing profile roofing sheets or fastening through thermal insulation blankets into wood purlins |
| T17HCG1275C3N | Gauge 12 – 11 | 75mm (approx. 3″) | Type 17 Timber Thread | High-rib metal roof profiles requiring deeper timber embedment for maximum wind resistance |
Professional Installation Guide for Leak-Free Timber Connections
-
Drive at a Strict 90-Degree Angle: Always drive the screw perpendicular to the metal sheet. Angled driving will deform the EPDM washer, resulting in premature seal failure and costly roof leaks.
-
Achieve Perfect Washer Compression: Do not over-torque the screw. Drive the fastener until the EPDM washer expands slightly past the metal flange of the screw head. Over-tightening will cause the washer to crack under intense sun exposure.
-
Ensure Minimum Embedment: For optimal wind-load and pull-out ratings, choose a screw length that ensures at least 25mm (1 inch) of solid thread embedment into the supporting timber structure underneath.
High-Performance Screws for Metal-to-Wood Fastening
A common challenge in roof construction is finding the perfect screw for wood to metal installation—specifically, attaching corrugated steel roofing profiles to timber sub-structures.
Our specialized Type 17 Timber-Tite™ Series is engineered precisely for this metal-to-wood application:
High-Performance Type 17 Timber Screws
-
Sharp Slashed Point (Type 17): The unique cut-point effortlessly pierces through the metal roof cladding, clears out wood fibers during insertion, and taps its own thread into hard timber without pre-drilling.
-
Anti-Splitting Design: Drastically reduces stress on the wooden purlins, preventing timber beams and battens from splitting or cracking during high-torque installation.
-
Advanced Thread Geometry: Designed with deep, coarse threads that maximize clamping force and deliver exceptional pull-out resistance against severe wind loads.
Application & Specification Overview
| Product Line | Primary Application | Substrate Compatibility | Coating Options |
| Timber-Tite™ Series | Fastening Metal Roofing Sheets & Cladding | Metal Roof to Timber Purlins / Wood Beams | AS3566 Class 3 (Ruspert Coating) |
TIMBER-Tite™ Double Thread Type 17 Timber Screws are made from hardened C-1022 and designed for crest fixing steel to wooden substrates. Scratshank clears swarf from the drill point penetration, protecting the Eco-BDN® Green Washer from unwanted damage, Double Thread Enhanced pull-out strength on timber, and the larger diameter upper thread securely fastens the sheets’ crest against the washer flange.
TIMBER-Tite™ Valley Fixing Type 17 Timber Screws are made from hardened C-1022 and designed for valley fixing steel to wooden substrates. The fastener features Type 17 sharp points and capable of penetrating timber 20mm and above. Timber-Tite fasteners all come with corrosion resistant coatings to cope with the elements.
Frequently Asked Questions About Metal-to-Wood Fasteners
Q: Can I use Type 17 screws to fix metal roofing sheets to wood structures? A: Yes, absolutely. BDN Type 17 Timber Screws are specifically designed as metal-to-wood fasteners. The sharp, slashed point cuts through wood fibers smoothly after piercing the metal profile, creating a secure, watertight bond between the metal roof sheet and the timber purlin without splitting the wood.
Q: What environments are BDN AS3566 Class 3 roofing screws suitable for? A: Our Class 3 treated screws provide high-level premium corrosion resistance, making them ideal for standard outdoor construction, residential roofing, and commercial building projects that require reliable defense against atmospheric weathering.
Secure Your Roof Profile with BDN Fasteners
When the long-term integrity of a commercial or residential building depends on the performance of its roof joints, BDN Fasteners delivers the ultimate barrier against wind, rain, and rust.
Contact our technical support team today for bulk wholesale pricing and AS3566 compliance submittals.
TIMBER-Tite™
For fixing roof sheeting to timber
TRUSS-Tite™
For fixing steel roof and floor trusses
Are you looking for something?
View more products or directly contact us!
If you need more information about our products or get samples, we are very happy to help!
Learn more about roofing screws >>
Impact of metal roof screws rusting & how to prevent the damage
BDN Fasteners (Broaden Worldwide Co., Ltd) is an ISO-9001 Certified Quality Supplier-Manufacturer of Australian Standard AS3566 self-drilling and self-tapping screws in various coatings for steel to steel and steel to timber applications. Our headquarters are in Taiwan and we operate sales and marketing offices in India and Thailand.
Founded in 2009.
