What Kind of Screws to Use for Roofing?

When it comes to roofing, the type of screws you use is very important for ensuring a secure and watertight installation. Here are some key points to consider:

1. Material and Coating:

• Roofing screws are typically made from steel and come with a corrosion-resistant coating. This is crucial because the roof is exposed to the elements, including rain, which can cause standard screws to rust over time.

• Common coatings include galvanized (zinc-coated), or other proprietary coatings that offer additional protection against corrosion.

2. Point Types:

• Drill Point (Self-Drilling): These screws have a drill bit at the tip and are designed to cut through metal without pre-drilling a hole. They are commonly used when attaching metal roofing panels to a metal structure, such as purlins or joists.

• Sharp Point (Piercing Point): These are used for attaching roofing materials to wood. The sharp point allows the screw to penetrate the wood easily, but they may require a pilot hole in harder materials to prevent splitting.

3. Sealing Washer:

A critical feature of roofing screws is the sealing washer, which is usually made of neoprene, EPDM (Ethylene Propylene Diene Monomer), or another rubber-like material. The washer compresses under the head of the screw, creating a seal that prevents water from seeping through the fastening point.

4. Color:

To maintain an aesthetically pleasing appearance, roofing screws often come in various colors to match the color of the roofing material. This helps the screws blend in, making them less noticeable.

5. Length and Diameter:

The length and diameter of the screws will depend on the thickness of the roofing material and the substrate (the surface to which the roofing is being attached). It's important to choose the correct size to ensure a strong hold without damaging the material.

6. Head Type:

The most common head types for roofing screws are hex, pan, and truss heads. Hex heads are easy to drive with a socket wrench, while pan and truss heads are more low-profile and are often preferred for their cleaner look.

Before purchasing, make sure to check the manufacturer's recommendations for the specific type of roofing material you're using, as well as local building codes and standards. If you're unsure about the best type of screws to use, consulting with a professional roofer or a hardware specialist is a good idea.

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