Why Adding Extra Shingle Layers Is Detrimental to Your Roof

When considering roof maintenance or repair, the method of simply adding new layers of shingles over old ones might seem like a cost-effective shortcut. However, this practice can lead to numerous long-term problems, ultimately compromising the integrity and functionality of your roof. Teflon Roofing, based in Chambersburg PA, emphasizes the importance of proper roofing practices to ensure the longevity and safety of your home. Below are key reasons why adding multiple layers of shingles to a roof can cause more harm than good.

Excessive Weight on the Roof Structure

The primary concern with adding multiple layers of shingles is the significant weight increase. A standard roof can accommodate a certain load, and each additional layer of shingles adds unnecessary stress. This extra burden can strain the roof decking and underlying support structure, leading to potential sagging, structural damage, or even collapse.

Compromised Roof Ventilation

Proper ventilation is crucial for maintaining the roof’s lifespan and effectiveness. Additional shingle layers can block ventilation paths, trapping heat and moisture in the attic. This environment accelerates the deterioration of both the new and existing shingles, reduces energy efficiency, and can lead to increased indoor temperature extremes.

Concealed Damage and Deterioration

Layering new shingles over old ones masks underlying issues such as wood rot, mold growth, and water infiltration. Concealed damage continues to worsen unseen, leading to costly repairs down the line. It’s crucial to remove old shingles and thoroughly inspect the roof deck and structure before installing new roofing materials.

Shortened New Shingle Lifespan

Shingles installed on top of existing layers are unable to properly adhere and lay flat. This incorrect installation can lead to accelerated wear, vulnerability to wind uplift, and uneven appearance. The lifespan of these new shingles is significantly reduced due to the compromised installation conditions.

Potential Warranty and Insurance Issues

Manufacturers’ warranties for shingles often require proper installation on a clean deck to be valid. Layering shingles may void these warranties, leaving homeowners without coverage for premature failure. Additionally, insurance companies might not cover damage caused by or related to improper roofing practices, including over-layering.

Difficulty in Roof Inspections and Repairs

Multiple layers of shingles make it challenging to conduct thorough inspections, identify leaks, and perform targeted repairs. Roofers face difficulties in tracing the source of issues, which can lead to broader, more invasive, and expensive repair work.

Legal and Code Compliance Risks

Building codes in many areas limit the number of permissible shingle layers, often to two. Ignoring these regulations can result in fines, legal complications, and the requirement to redo the roof correctly at additional expense. Always comply with local building codes and permit requirements to avoid such risks.

Conclusion

Opting to layer new shingles over old ones might appear to be an economical solution in the short term, but it introduces a host of problems that can jeopardize the roof’s integrity, functionality, and the overall safety of your home. Prioritizing proper roofing techniques and adhering to building codes not only extends the life of your roof but also preserves the value and security of your property.