Roof Assemblies

IRC 2024 Asphalt Shingle Installation: Nailing, Overlap, and Ice Dam Requirements

How many nails does IRC 2024 require per asphalt shingle, and what are the overlap and ice dam shield requirements?

R905.2

IRC 2024 Chimney Cricket: Required When Chimney Is 30 Inches or Wider

When does IRC 2024 require a chimney cricket (saddle), and how must it be constructed and flashed?

R903.2.2

IRC 2024 Drip Edge: Required at Eaves and Rakes Under Asphalt Shingles

Does IRC 2024 require drip edge flashing on asphalt shingle roofs, and how does the installation differ at eaves versus rakes?

R905.2.8.5

IRC 2024 Roof Deck Sheathing: OSB and Plywood Thickness for Different Rafter Spacing

What thickness of OSB or plywood does IRC 2024 require for roof deck sheathing based on rafter spacing?

R803.1

IRC 2024 Roof Slope: Minimum Pitch by Roofing Material Type

What is the minimum roof slope required by IRC 2024 for asphalt shingles, metal roofing, tile, and low-slope applications?

R905

IRC 2024 Roof Underlayment: #15 Felt vs Synthetic Felt Requirements

Does IRC 2024 require #15 felt or synthetic underlayment under asphalt shingles, and what are the overlap and low-slope requirements?

R905.2.3

IRC 2024 Roof Ventilation: 1-to-150 Ratio for Attic Ventilation

What ventilation ratio does IRC 2024 require for attic spaces, and how do intake and exhaust vents need to be balanced?

R806

IRC 2024 Valley Flashing: Open vs Closed Valley Installation Methods

What does IRC 2024 require for valley flashing, and what are the differences between open, closed-cut, and woven valley methods?

R905.2.8