Question 34

Trimmed asphalt shingles are suitable for a starter strip when installing asphalt shingles over an existing roof.

Using trimmed asphalt shingles for a starter strip is a common practice in roofing, as it provides an effective barrier against water infiltration and helps in aligning the subsequent rows of shingles correctly.

A) 15-pound felt underlayment.

While 15-pound felt underlayment is an essential component in roofing systems, it is not typically used as a starter strip. Its primary role is to serve as a moisture barrier beneath the shingles, rather than to provide the necessary edge and support that a starter strip requires.

B) Sheet metal.

Sheet metal can be used in roofing applications, but it is not suitable as a starter strip for asphalt shingles. Metal strips do not provide the same level of compatibility with asphalt shingles and may lead to improper sealing and alignment.

C) Trimmed asphalt shingles.

Trimmed asphalt shingles are indeed the appropriate choice for a starter strip. They are specifically designed to create a secure and effective base for the main roofing shingles, preventing potential water damage and ensuring proper installation.

D) Wood sheathing.

Wood sheathing is a structural component of a roof but does not function effectively as a starter strip. It lacks the necessary waterproof properties and does not provide the same coverage and alignment benefits that trimmed asphalt shingles do.

Conclusion

Trimmed asphalt shingles are the most effective and appropriate material for a starter strip when installing asphalt shingles over an existing roof. Other options, such as felt underlayment, sheet metal, and wood sheathing, do not fulfill the specific requirements needed for optimal performance and alignment in the roofing system. Thus, option C stands out as the definitive choice.