Ferrotek Sheet to Timber Gash Point Screw with EPDM Washer – Weather‑Sealed Fixing for Metal Sheets to Timber

Ferrotek Sheet to Timber Gash Point Screws with EPDM Washer are purpose‑designed for fixing profiled metal sheets and flashings to timber substrates. Featuring a sharp gash / self‑piercing point, coarse wood thread and a bonded EPDM sealing washer, they provide a fast, secure and weather‑tight fixing for roofing, cladding, sheds, agricultural buildings and timber-framed structures. These ferrotek steel self drilling screws ensure durability and stability in various construction applications. Their innovative design reduces installation time and enhances the overall strength of joints in both residential and commercial projects. Additionally, the corrosion-resistant coating prolongs their life even in harsh environments, making them a reliable choice for contractors and builders alike. These ferrotek steel self drilling screws are ideal for use in a variety of applications due to their ability to handle tough materials with ease. Their durability ensures long-lasting performance, making them a reliable choice for both professional contractors and DIY enthusiasts. Whether you’re working on roofing or any timber construction project, these screws deliver an efficient and secure fastening solution.

Ferrotek Sheet to Timber Gash Point Screws with EPDM Washer are engineered to simplify fixing metal roof and wall sheets directly to timber battens, rafters and purlins. The gash (self‑piercing) point is designed to cut cleanly through thin steel or aluminium sheets, then immediately engage the timber substrate, eliminating separate drilling in most standard applications.

The screw’s coarse, deep wood thread provides strong anchorage in softwood and most common timber used in roofing and cladding, such as:

• Timber purlins and rafters
• Roof battens
• Timber framing and rails

This makes them ideal for installing:

• Corrugated and box‑profile metal roof sheets
• Side cladding sheets and flashings
• Metal sheeting on sheds, garages and agricultural buildings

Under the hex washer head is a bonded EPDM sealing washer which compresses as the screw is tightened, creating a long‑lasting weather‑tight seal around the fixing point. EPDM rubber is highly resistant to UV, ozone and temperature changes, making it suitable for exposed roof and wall applications.

Ferrotek sheet‑to‑timber screws are manufactured from hardened steel with a corrosion‑resistant coating (commonly zinc or an organic system – always check the specific product listing). They are driven using a suitable hex socket on a corded or cordless drill/driver or impact driver, making installation quick and consistent on site.

Typical Use Cases

• Fixing metal roof sheets to timber purlins and rafters on sheds, garages and agricultural buildings.
• Securing side cladding sheets to timber rails and framing.
• Attaching flashings, barge boards, ridge and verge trims to timber structures.
• Cladding timber-framed workshops and outbuildings with steel or aluminium sheet.
• General sheet-to-timber fixing where a sealed, durable connection is required.

Installation & Best Practice Tips

1. Check material thickness: Ensure the sheet thickness and timber section are within the screw’s piercing and thread engagement range. For very thick or hard sheets, pre‑drilling may still be required.
2. Use correct driver & speed:
   • Fit an appropriate magnetic hex socket to your drill/driver or impact driver.
   • Use rotary-only (no hammer) at a moderate speed to avoid overheating and stripping.
3. Fix at 90°: Present the screw square to the sheet (90°) so the gash point pierces cleanly and the washer seals evenly.
4. Apply steady pressure: Use firm, consistent pressure so the point pierces the sheet and bites into timber; allow the thread to pull the materials together.
5. Correct washer compression: Tighten until the EPDM washer is evenly compressed and slightly bulged under the head:
   • Do not over‑tighten – crushing the washer can reduce its sealing life and damage coatings.
   • Do not under‑tighten – insufficient compression can leave gaps and leaks.
6. Follow fixing patterns: Install to the sheeting / roofing manufacturer’s recommended fixing pattern for spans, laps and exposure conditions.

Always follow Ferrotek guidance, the sheet manufacturer’s fixing instructions and relevant roofing/cladding best practice. Wear appropriate PPE – safety glasses, gloves and hearing protection – when installing.

Ferrotek Sheet to Timber Gash Point Screw with EPDM Washer Features

• Gash / self‑piercing point – cuts through thin metal sheet and penetrates timber in one operation.
• Coarse wood thread – provides high pull‑out strength in timber battens, purlins and framing.
• Hex washer head – allows high torque transfer and offers a broad bearing surface on the sheet.
• Bonded EPDM sealing washer – delivers a durable weather seal under the head, resistant to UV and temperature cycling.
• Corrosion‑resistant coating – typically zinc or organic coated for external environments (verify exact finish on datasheet).
• Multiple sizes available – a range of lengths and diameters to suit different sheet profiles and timber thicknesses (check specific SKUs).
• Trade‑quality manufacture – Ferrotek fasteners designed for roofing, cladding and timber construction professionals.

Technical Information

• Product type: Sheet to timber gash point screw with bonded EPDM washer.
• Application: Fixing metal roof and wall sheets (steel or aluminium, within thickness limits) to timber substrates.
• Material: Hardened carbon steel screw (see product spec for exact grade).
• Head type: Hex washer head for use with hex socket driver.
• Washer: Bonded EPDM rubber sealing washer (diameter/thickness per specific product size).
• Drive: Hex (across flats size as specified – typically 8mm or similar; confirm on packaging).
• Point: Gash / self‑piercing point for sheet penetration and timber entry (not a steel‑to‑steel drill point).
• Thread: Coarse wood thread; often partially threaded for improved clamping (verify on data sheet).
• Coating / finish: Zinc or organic corrosion‑resistant coating suitable for typical roofing and cladding environments (for aggressive / marine conditions, consult Ferrotek data).
• Typical substrates: Thin steel or aluminium sheets fixed to softwood purlins, battens and timber framing.
• Tool compatibility: Corded/cordless drill/driver or impact driver with appropriate hex socket; variable speed recommended.
• Performance & standards: For pull‑out values, shear performance, corrosion testing and any referenced standards, refer to the latest Ferrotek technical documentation.

For safety‑critical roofing and cladding applications, follow the system designer’s specification for fastener type, size, spacing and corrosion class.

Frequently Asked Questions – Ferrotek Sheet to Timber Gash Point Screw EPDM Washer

1. What’s the difference between a gash point and a self‑drilling (tek) point?

A gash / self‑piercing point is designed to cut through thin sheet metal and then bite into a softer substrate like timber. A self‑drilling (tek) point is a true drill tip intended for steel‑to‑steel connections. Ferrotek sheet‑to‑timber gash point screws are optimised for sheet to timber, not heavy steel‑to‑steel applications.

2. Do I need to pre‑drill the sheet or timber?

In many cases, no pre‑drilling is needed – the gash point will pierce the sheet and the coarse thread will cut into the timber. However, pre‑drilling may be advisable when:

• Sheets are thicker or particularly hard

• Working in very dense or hardwood timber

• Fixing close to edges where splitting is a concern
Check Ferrotek and sheet manufacturer guidance for best practice.

3. Where should I place the screws on profiled sheets?

This depends on the sheet manufacturer’s recommendations. Common practice is:

• In the crown of the profile for roof sheets (to minimise ponding)

• In troughs or crowns for side cladding, as specified by the system
Always follow the cladding/roofing supplier’s fixing pattern and edge distance guidelines.

4. How tight should I drive the screw?

Tighten until the EPDM washer is evenly compressed and just begins to bulge around the head, with no visible gaps. Do not over‑tighten – crushing the washer or deforming the sheet can compromise the seal and shorten service life.

5. Are these suitable in marine or highly corrosive environments?

Standard Ferrotek coated screws are intended for typical external roofing and cladding conditions. For coastal, marine or highly corrosive industrial environments, enhanced corrosion‑resistant fasteners (e.g. higher‑grade organic coatings or stainless steel) may be required. Consult the project specification, cladding manufacturer and Ferrotek technical data for the correct corrosion class.

Ferrotek Sheet to Timber Gash Point Screw with EPDM Washer Common Uses / How to Use

Common Uses

• Attaching corrugated and box‑profile sheets to timber purlins on sheds and barns.
• Fixing metal cladding to timber‑framed workshops and outbuildings.
• Securing ridge, verge and barge flashings to timber structures.
• Cladding garden buildings and lean‑tos with steel sheeting.
• General sheet metal to timber fixing where a sealed fixing is required.

How to Use – Step‑by‑Step Summary

1. Check specification: Confirm the screw length, diameter and coating are suitable for your sheet thickness and timber depth.
2. Set up tooling: Fit the correct hex socket to a variable‑speed drill/driver or impact driver (rotary‑only).
3. Position the sheet: Lay sheets in place according to the roofing/cladding layout, aligning laps and edges.
4. Place the screw: Hold the screw perpendicular to the sheet at the recommended fixing point (crown or trough as specified).
5. Drive the screw: Apply firm pressure and drive at moderate speed until the point pierces the sheet and bites into timber, then allow the thread to draw the sheet down.
6. Seal the washer: Continue driving until the EPDM washer is evenly compressed; stop immediately once a good seal is formed.
7. Repeat to pattern: Install remaining fixings to the specified spacing and pattern for the sheet system.