Why, when and how to replace metal roof screws
Metal roofs are popular for their durability, energy efficiency, and sleek aesthetic appeal in Northwest Florida. Designed to withstand harsh Florida weather, they can last anywhere from 40 to 70 years, making them a wise choice for many property owners. However, one crucial component that can sometimes get overlooked in maintenance is the screws. Over time, these screws can deteriorate, causing potential leaks and structural issues. Let’s dive into why metal roof screws need periodic replacement, how often they should be replaced, and what you should consider if you're planning to do it yourself or hire a professional.
Why Do Metal Roof Screws Need Replacing?
Unlike shingles or other roofing materials that generally require fewer fasteners, metal roofs depend heavily on screws to secure the metal panels to the roof deck. As your roof ages, screws face the effects of weather exposure, tension, and general wear and tear. Here are a few reasons screws in metal roofs eventually need replacing:
Expansion and Contraction: Metal naturally expands and contracts with temperature fluctuations. This daily movement, known as “thermal movement,” can cause screws to loosen over time, potentially creating gaps where water can enter.
Rust and Corrosion: While the metal roof panels are typically made to resist rust, screws might not have the same level of corrosion protection. Rusted screws can weaken, snap, or fail to keep the roof panels tightly in place.
Deterioration of Rubber Washers: Metal roof screws usually come with a rubber washer, which creates a waterproof seal when the screw is tightened. With age and exposure to UV rays, these washers can dry out, crack, or compress, compromising their seal and increasing the risk of leaks.
Wind and Storm Damage: High winds, storms, and other extreme weather can stress screws and washers, loosening them or even stripping the threads. Loose screws increase the risk of panels lifting, especially at the edges and corners of your roof.
How Often Should Metal Roof Screws Be Replaced?
The frequency of screw replacement largely depends on your climate, roof design, and the quality of the materials initially installed. Generally, most experts recommend inspecting metal roof screws every 5 to 10 years. In Northwest Florida we say 4 to 7 years. During these inspections, if you notice any loosened or rusted screws, washers showing signs of wear, or even small leaks, it may be time to replace screws across the roof. Regularly inspecting your roof, especially after severe weather, is a proactive way to catch screw issues early and avoid more extensive repairs.
DIY vs. Hiring a Professional: Things to Consider
Replacing screws on a metal roof isn’t as simple as grabbing a drill. Whether you’re considering doing it yourself or hiring a contractor, here are some important considerations:
1. Safety Precautions
Working on a metal roof requires balance, knowledge of roof safety equipment, and care. Metal roofs are smooth and can become very slippery when wet. Using fall protection equipment like harnesses, ensuring your ladder is secure, and avoiding work on rainy or windy days are crucial for safety.
2. Matching Screw Types and Materials
When replacing screws, it’s essential to match the new screws with the existing roof material and design. Look for screws specifically designed for metal roofs with rubber or EPDM washers, which provide UV resistance and create a tight seal. Replacing screws with the wrong size, type, or material can lead to improper installation, which may cause further damage and leaks.
3. Tension and Torque Control
The amount of torque used when tightening the screws is critical. Overtightening can compress and damage the washer, reducing its lifespan, while under-tightening may leave gaps that allow water to seep in. Using a drill with a torque control setting can help ensure each screw is fastened at the correct tension. Professionals are trained to get the right balance, so this is something to keep in mind if you’re opting for DIY.
4. Replacing Washers Alongside Screws
Sometimes, if screws are still structurally sound but washers show signs of wear, you might consider just replacing the washers. However, it can be challenging to find washers that fit the screws perfectly, and it might be more efficient to replace both. Replacing both parts ensures a fresh, reliable seal against moisture. Using combination roofing screws is worth the cost.
5. Assessing Roof Condition
Before replacing screws, check the overall condition of the roof. If there are visible signs of rust, warping, or shifting panels, a more extensive inspection may be necessary. This could reveal underlying issues that require more than just a screw replacement, such as repairs to panels or the roof deck.
6. Cost Considerations
Replacing screws on a metal roof can be a budget-friendly DIY project if you only need to replace a few screws, but costs can add up quickly if extensive replacement is necessary. Hiring a professional typically costs between $300 and $700, depending on the size of the roof and the extent of the work. If you go the DIY route, remember to budget for high-quality screws and washers that will hold up over time.
Steps for Replacing Screws on a Metal Roof
If you’re up for the challenge and decide to replace the screws yourself, here’s a basic guide to help you get started:
Inspect the Roof: Start by inspecting the roof, marking any screws that appear rusted, loose, or have washers that look degraded.
Select the Right Replacement Screws: Choose screws made for metal roofing, ideally stainless steel or galvanized steel with UV-resistant washers to avoid future rust and wear.
Remove Old Screws Carefully: Using a drill with a magnetic bit, remove each screw carefully. Ensure you’re not damaging the metal roof panel as you go. If the screw resists coming out, avoid using force, as this could damage the metal.
Install New Screws with Proper Torque: Insert the new screw into the same hole, making sure not to overtighten. Remember, the rubber washer should be compressed just enough to create a seal, but not so much that it starts to crack or deform.
Seal Old Holes (if Necessary): Sometimes, screws may not fit well in the old holes. If that happens, seal the old hole with a high-quality roofing sealant and install a new screw nearby to ensure the panel remains secure.
When to Call a Professional
For property owners with a large or steep roof, calling in a professional is generally the safer and more efficient choice. Professionals bring experience and the right equipment, including safety gear and calibrated drills that ensure the screws are tightened perfectly. Additionally, a contractor can inspect the roof for other maintenance needs, such as panel replacement or waterproofing, providing a more comprehensive solution. Our Emerald Coast maintenance service would be happy to recommend a license contractor in the Florida Panhandle area.
Protecting Your Metal Roof Investment
Regularly inspecting and replacing screws is a critical part of maintaining a metal roof’s longevity and leak protection. By taking care of minor screw replacements, you prevent more severe problems and protect your investment in your roof.
For DIY enthusiasts, replacing screws on a small, accessible roof can be a fulfilling project. But if your roof is large, steep, or shows signs of wear beyond screws, consider consulting a roofing professional to avoid further damage and ensure the best long-term results.
In the end, a little attention to screws can go a long way in keeping your metal roof strong, safe, and in top shape for decades to come.
