Gambrel Roof Guide
Understand the space, weather and maintenance tradeoffs of a gambrel roof.
A gambrel roof has two slopes on each side: a shallow upper slope and a much steeper lower slope. It is often associated with barns and Dutch Colonial homes.
Main benefit: interior volume
The steep lower planes create more usable upper-story or attic space than many roofs of similar height. That can make a gambrel attractive for lofts, garages and additions.
Weather considerations
The change in slope creates a transition that must be detailed correctly. Broad upper slopes can retain snow depending on pitch and exposure, while large wall-facing planes and overhangs require appropriate wind design.
Maintenance
Inspect slope transitions, flashing, dormers and penetrations. Gutters and drainage should be sized and placed to handle runoff from both roof planes.
Before choosing one
- Confirm the framing and loads with a qualified designer where required.
- Choose a roofing product approved for both pitches.
- Include safe future access and ventilation in the design.
Related roof planning
Review common roofing materials, compare gambrel geometry with the mansard roof, and learn how extra slopes and transitions affect replacement cost.
Need work on a gambrel roof?
Mention the change in slope, access and current covering when requesting estimates.