St Louis Roofing: Article About Roofing Underlayment Details
When St Louis roofing professionals work with homeowners on a roof replacement project, great care is taken to pick out the best shingle or top layer product. The home must be protected from weathering while offering an aesthetically pleasing appearance for curb appeal. However, the material underneath the shingles is also critical to roof functionality. Learning about underlayment's construction and installation details gives homeowners a deeper understanding of the roof's internal system.
Underlayment comes in two different types: synthetic or asphalt saturated felt. Many older rooftops have traditional felt that works well when shingles are in good health across the surface. As new roofs are being installed, many roofers suggest synthetic underlayment. This manufactured product has more resilience against weathering if exposed than the felt, for instance. Contractors should discuss the merits of both materials before settling on a selection that fits both the homeowner's personal style and budget.
When felt is selected, contractors also cover the thickness choices. A budget friendly felt underlayment has a thickness specification of 15 pounds. It covers the rooftop for years of moisture free protection, but it is relatively thin. A stronger, but more expensive, underlayment is 30 pound felt. This material can be stepped on during installation without any concerns about tearing. If it's ever exposed on the rooftop, this felt can withstand some weathering before allowing any leaks into the home.
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Almost all roofing materials, including shingles, are aligned in an overlapped fashion. Protecting seams from leaks is the main purpose of overlapping installations. Underlayment must be overlapped in specific dimensions based on the roof's pitch. A steep slope roof usually has two inches of overlap, whereas a low slope surface requires a large 19 inch overlap. Contractors survey the surface to pick out the right installation strategy for superior weathering protection.
Underlayment is normally stapled to the roof sheathing. These staples enter the underlayment and quickly adhere to the material. Underlayment creates a water resistant connection with the staples' ends, keeping the home free from any leaks. If contractors use larger fasteners, the underlayment's construction might be compromised. Some roofers even add tacks along some edges to ensure the material remains flush against the structure.
It's important to note that most contractors don't reuse underlayment for either repairs or replacement projects. If shingles are being pulled off, the underlayment below is usually torn during the process. It's much more cost effective for roofers to simply replace underlayment and shingles simultaneously to protect the entire structure from moisture damage.