What Are Tek Screws For Roofing?
Key Features To Look For
- Material and coating: Common choices include zinc-plated steel, stainless steel, and coated variants (e.g., aluminum-coated or polymer-coated). Stainless steel offers superior corrosion resistance in coastal or harsh environments.
- Drill point design: A sharp self-drilling point reduces the need for pilot holes and speeds installation, especially on thicker materials.
- Thread type: Self-tapping threads provide a secure grip in metal substrates. Some screws have a nib or thread-forming feature to reduce material fatigue.
- Washer and gasket: Integrated washers seal the hole to prevent leaks. A bonded gasket helps accommodate minor roof movement and thermal expansion.
- Head style: Pan, hex, or bugle heads are common; the choice depends on aesthetic goals, tool access, and seating requirements.
- Coatings for durability: Exterior-use tek screws typically have corrosion inhibitors or polymer coatings designed to endure UV exposure and weathering.
Materials And Compatibility
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| Roofing Material | Substrate | Recommended Screw Type | Notes |
|---|---|---|---|
| Metal panels (galvanized steel, aluminum) | Steel or aluminum supports | Stainless or coated steel with integrated washer | Consider corrosion resistance in coastal zones |
| Steel roofing | Steel decking or purlins | Coated steel or stainless steel | Ensure compatible coating to prevent galvanic corrosion |
| Coated or painted panels | Wood or metal decking | Coated or stainless screws with rubberized washer | Avoid over-penetration that might damage coatings |
| Architectural metal shingles | Wood or metal backing | Bugle head or countersunk options | Match fastener length to panel thickness |
Installation Best Practices
- Pre-inspection: Check panel thickness, substrate condition, and existing fasteners. Replace damaged components before proceeding.
- Pilot considerations: Use the correct drill point to minimize effort; avoid overdriving, which can strip threads or crack panels.
- Seal and seating: Ensure washers sit flat and fully seal around the screw head. Do not over-compress gaskets, which can fail seals.
- Fastener spacing: Follow manufacturer guidelines for spacing, typically 12-24 inches apart on field and closer at edges or near openings, depending on wind loads.
- Depth and alignment: Drive screws perpendicular to the surface for an even seal. Do not skew screws, which compromises the washer seal.
- Inspection and maintenance: Periodically inspect for loose screws, missing washers, or corrosion, especially after severe weather.