Florida Home Inspector Practice Test

What type of roof requires an underlayment of felt between courses?

1. Asphalt shingles

2. Tile roof

3. Wood shakes

4. Metal roofing

The correct answer is: Wood shakes

The type of roof that requires an underlayment of felt between courses is wood shakes. This underlayment plays a critical role in providing a secondary layer of protection against moisture infiltration. Wood shakes are more susceptible to rot and decay since they are made from natural materials, so the felt underlayment helps to divert water and protect the wood from harsh weather conditions. In addition to its moisture protection capabilities, felt underlayment assists in creating a smoother surface for the wood shakes to lie against, reducing the risk of damage from wind uplift and other mechanical forces. The practice of using underlayment is particularly vital for wood shakes because it ensures the longevity and durability of the roofing system, ultimately enhancing its performance over time. Asphalt shingles typically do not require felt underlayment between courses, as they have their built-in water-resistant properties. Tile roofs, while often using underlayment, do not need felt specifically between the tiles; instead, they rely on a different arrangement and material for weatherproofing. Metal roofing, on the other hand, is generally installed over a solid substrate and does not necessitate felt underlayment between the metal panels.