Pitched roof into flat/shed roof over a porch. in Q&A Posted May 16 For a weatherproof transition between these roof types, implement these critical steps: Structural Connection: Install double 2x ledger board on main house with 1/2" galvanized through-bolts (spaced 16" OC) Use Simpson H1 hurricane ties at rafter connections Water Management: Step flashing must extend 12" up pitched roof under shingles Saddle flashing over flat roof membrane (minimum 24-gauge galvanized) Slope flat roof 1/4" per foot toward scupper drain Material Transitions: Ice/water shield over entire flat roof deck + 3' up pitched roof EPDM or TPO membrane for flat section with termination bar at pitch transition Climate Consideration: In freeze-thaw regions, add heating cable in gutter above transition to prevent ice dam formation.
Pitched roof into flat/shed roof over a porch.
in Q&A
Posted
For a weatherproof transition between these roof types, implement these critical steps:
Structural Connection:
Water Management:
Material Transitions:
Climate Consideration: In freeze-thaw regions, add heating cable in gutter above transition to prevent ice dam formation.