What’s Hiding Under Your Shingles? A Homeowner’s Guide to Roof Decking & Code Surprises

Getting a new roof is an exciting investment in your home’s safety and curb appeal. You’ve picked out the perfect shingles and are looking forward to a beautiful, durable result. But what about the parts you can’t see? The foundation of your entire roofing system lies just beneath the shingles: the roof decking. For many Sheboygan homeowners, especially those with older houses, the condition of this hidden layer can lead to unexpected costs and project delays.

At Roofers Roofing, we believe in transparency and preparation. Unexpected issues don’t have to be stressful when you’re working with a team that has a clear plan. This guide will walk you through common roof decking problems, explain how they relate to Wisconsin building codes, and detail our straightforward process for handling them, ensuring your project stays on track and on budget.

The Unsung Hero: What is Roof Decking?

Think of roof decking (also called sheathing) as the bedrock of your roof. It’s the layer of wood panels, typically plywood or oriented strand board (OSB), that is fastened to the trusses and rafters of your home. This surface serves several critical functions:

• It provides a solid, flat surface for the underlayment and shingles to be securely attached.
• It adds structural integrity to the entire roof frame, helping it withstand weight from snow and pressure from high winds.
• It acts as a barrier, protecting your attic and home from the elements during the installation process.

Without solid, continuous decking, your new shingles won’t perform as designed, warranties can be voided, and your home remains vulnerable. That’s why addressing decking issues is not an upsell—it’s a crucial step for a long-lasting, reliable roof.

Common Surprises We Find Under Old Roofs

Once we tear off the old shingles, we get a clear view of the decking. In Wisconsin, years of harsh weather can take a toll. Here are the two most common issues we encounter:

1. Rotted or Water-Damaged Decking: Moisture is the number one enemy of wood. Small, undetected leaks, poor attic ventilation, or the formation of destructive ice dams can allow water to seep under the shingles and saturate the decking over time. This leads to rot, which makes the wood soft, spongy, and unable to hold nails securely. Simply roofing over rotted wood is a recipe for premature failure and future leaks.

2. Spaced Decking (or Skip Sheathing): Many older homes were built with spaced decking—planks of wood with intentional gaps between them. This was a common practice when wood shingles or shakes were used, as it allowed the materials to breathe. However, modern asphalt shingles require a solid, continuous surface to meet manufacturer specifications and Wisconsin building codes. If we find spaced decking, it must be covered with a new layer of sheathing to ensure your new roof is properly supported and warrantied.

Our Transparent Process for Handling Decking Issues

Discovering that you need decking work can be worrying, but we handle it with a clear, upfront process to eliminate surprises. We build trust by communicating openly and ensuring you are in control.

Here’s exactly what to expect if we find an issue:

1. Initial Assessment: We include the replacement of up to three sheets of rotted plywood in our standard residential roofing contracts, as minor issues are common.
2. Stop and Document: If we find more extensive rot or discover spaced decking that requires a full roof re-decking, we immediately pause our work. We take clear photos and videos to show you exactly what we’ve found and why it needs to be addressed.
3. Clear Communication: We contact you right away to explain the situation, walk you through the necessary repairs, and provide a clear, itemized change order for the additional materials and labor.
4. Your Approval: We will not proceed with any additional work or cost until you fully understand the issue and have given your approval. Your peace of mind is our priority.

This transparent approach ensures that you know exactly what you’re paying for and why it’s essential for the long-term health of your home.

The Power of a Proactive Roof Inspection

A thorough inspection is the best tool for preventing major surprises. While we can't see every inch of decking before the tear-off, a comprehensive evaluation can reveal many red flags. During our initial visit, we don’t just look at your shingles. We enter your attic to check the underside of the decking for signs of water staining, dark spots, or visible rot. This allows us to anticipate many potential issues and include them in the initial estimate, giving you a more accurate budget from the start. Our detailed roof inspections are designed to give you the most complete picture possible before the project even begins.

A Solid Roof Starts with a Solid Foundation

Your roof is more than just the shingles you see from the street. The decking beneath is the foundation that ensures your home is protected for decades to come. While discovering rotted or non-compliant decking can be an unexpected turn, it’s a critical issue to resolve correctly. With a commitment to clear communication and professional integrity, the team at Roofers Roofing turns a potential problem into a straightforward solution.

If you’re concerned about the condition of your roof or are planning a replacement for your Sheboygan-area home, contact us today. Let’s start with a thorough inspection to ensure your new roof is built on a foundation of strength and quality.