Recently, as the rainy season hits many regions, cases of roof leaks and water damage repairs have risen significantly. Homeowners are finding themselves forced to pay costly repair bills within a short period. Industry experts warn that the real issue often lies not with the visible shingles, but with the hidden “underlayment” system beneath them.

Traditional felt underlayment has long been a weak point in roofing due to its tendency to absorb water and tear easily. Once moisture penetrates, it accelerates the rotting of the plywood underneath, causing the entire roof system to fail prematurely. In contrast, synthetic underlayment—lighter, stronger, and more water-resistant—has quickly become the preferred choice for both new builds and reroofing projects.

“Most homeowners only notice problems when shingles are visibly damaged, but the true protection comes from the underlayment you can’t see,” said a roofing contractor. “If low-quality materials are used, repair costs down the line can be many times higher than the initial savings.”

Beyond underlayment, roofing materials as a whole are undergoing upgrades. Metal roofs, known for their durability and recyclability, are being adopted in more residential and commercial projects. Some manufacturers have also introduced new products with energy-efficient coatings, helping reduce indoor heat and lowering energy bills.

Industry data shows that homeowners who invest in high-performance underlayment and durable roofing materials can cut their lifetime roof repair costs by more than 30%. With extreme weather events becoming more frequent, this trend is expected to accelerate.

Experts advise homeowners to look beyond aesthetics and upfront costs when choosing a roof. Focusing on the hidden “second line of defense” beneath the shingles can reduce unexpected expenses while ensuring safety and comfort for years to come.