Roofing Materials & Installation Techniques Flashcards

What is the correct starter strip installation requirement at the eave before applying the first course of shingles?

Answer: Starter strip should overhang the drip edge by 1/4 to 3/8 inch

The starter strip should overhang the drip edge by 1/4 to 3/8 inch at the eave and rake to ensure water drips into the gutter rather than wicking back under the roofing.

OSB roof decking requires edge spacing to allow for expansion. What is the standard gap between panels?

Answer: 1/8 inch gap at all edges and ends

OSB panels should be spaced 1/8 inch at all edges and ends to allow for expansion from moisture and temperature changes without causing buckling.

What type of nail is recommended for attaching asphalt shingles in coastal or high-humidity environments?

Answer: Stainless steel roofing nails

Stainless steel nails are recommended in coastal and high-humidity environments because they provide superior corrosion resistance compared to standard galvanized nails.

When installing laminated (architectural) shingles, why is it important to vary the starting point of each course?

Answer: To prevent vertical alignment of joints and water channels

Staggering the offset of each course by at least 6 inches prevents joints from aligning vertically, which would create a channel for water infiltration.

What is the GAF-recommended minimum temperature for applying standard asphalt shingles in cold weather?

Answer: 40°F (4°C)

GAF and most manufacturers recommend that standard asphalt shingles not be installed when temperatures fall below 40°F (4°C) because shingles become brittle and the adhesive strip may not seal properly.

Which component of a ridge vent system prevents wind-driven rain from entering the attic?

Answer: The external baffle or weather filter

The external baffle or weather filter on a ridge vent deflects wind and precipitation upward away from the vent opening while still allowing hot air to escape the attic.

What is 'racking' in shingle installation, and why is it generally discouraged?

Answer: Installing shingles from ridge to eave in vertical columns, which can cause misalignment

Racking involves installing shingles in vertical columns rather than horizontal courses; it can cause misalignment, improper offset, and is not approved by most manufacturers as it may void warranties.