St Louis Roofing: Article About Proper Roof Material Overlapping
Homeowners can be sure they have a strong rooftop when their roofing materials are overlapped according to industry regulations. Flashing, underlayment and shingles are core layers that must have specific overlapping installations to keep water flowing to gutters and drains below. It's important for homeowners to be aware of their roof's overlapping structure as St Louis roofing professionals add a new rooftop to existing infrastructure.
Underlayment below the shingles is normally rolled out in courses, covering the wood deck entirely. However, contractors must overlap all edges to prevent moisture from seeping through seams. Low slope roofs have more leak vulnerabilities because of the pitch, so underlayment overlap should be about 19 inches. In contrast, steep slopes offer an extreme angle for water to flow. These surfaces only require about two inches of underlayment overlap. Homeowners are welcome to ask about their home's overlap based on roof pitch to understand the process even further.
Homeowners are probably familiar with their rooftop's overlapping shingle structure. This roofing technique adds an attractive aesthetic appeal to the structure while forcing water down the surface. Another advantage to overlapping shingles is fastener protection.
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Each shingle has several nails holding it to the structure, but even the best quality nails can rust if exposed to weathering elements. The shingle overlap covers all nails, allowing them to hold the materials steady for decades at a time.
Generally, flashing overlaps shingles at transition points. This metal provides extra protection where water flow is most concentrated, such as at roof valleys. Homeowners might notice this flashing being overlaid with shingles, however. This strategy isn't incorrect, but simply creates a better aesthetic effect for the home. The flashing still performs properly beneath the shingle layer, directing water into nearby gutters.
Overlapping shingles can also occur at the roof's ridge. This peak is where two pitched sides meet at a point. It's vulnerable to leaks, so roofers cover the meeting point with several stacked shingles. Alternatively, ridge caps might be used for a better aesthetic. These effective covers stop water from entering the ridge while reducing the stacked look from a ground perspective.
Many overlapping mistakes are easily seen at the headwall. Homeowners can look at these transition points on the roof to see if all materials look like one cohesive unit. If materials are sticking out or appear misaligned, speak with a project supervisor immediately. Workers may be still working on the area, but communication about the overlapping concern helps everyone feel comfortable with a roof installation.