Gable form
Two principal roof slopes meet at a ridge; their edges and water exits must be coordinated with doors and site access.
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Guide 04 / planning decisions
Choose roof form around drainage, height, and local exposure.
A roof shape changes the shed’s visual profile, headroom, drainage path, material coverage, and site constraints. Use it to frame a product and yard decision - not to infer structural members or connections.
Compare
Define the intended use first.
Confirm
Match products and local rules.
Plan
Carry the decision into the site plan.
Where does the roof system meet the site?
Coordinate the roof form and water exit with the whole building. Finish coverage does not specify the supporting roof assembly, its loading, ventilation or the discharge route.
Single-slope form
One principal slope concentrates its low-edge discharge on one side. Check that side against the entrance and site drainage plan.
Read the applicable system and product instructions
APA moisture-management guidance discusses moisture in wood floor, wall and roof systems. APA’s builder document directory provides system-specific publications. These are general North American guidance, not approval of our shed examples; check the selected product and local design requirements. Source pages checked September 14, 2026. Access to individual publications may have additional conditions.
See the P01 storage task and its limitations · Coordinate the foundation scope · Calculate a separately defined finish scope
The decision set
Resolve the questions before you choose a system.
A Planning Reference can help establish the footprint and intended use. It cannot specify structural members, fastening, support layout, load assumptions, or permit compliance for your site.
Where should water go?
Trace the roof’s runoff path before selecting a form. Keep water away from doors, foundations, access routes, neighboring property, and places restricted by local rules.
How much height is acceptable?
Compare ridge or high-side height with property lines, visibility, nearby structures, access, and any local height limits before treating a roof form as settled.
What covering suits the project?
Compare appearance, slope limits, climate exposure, maintenance, accessories, and manufacturer requirements for the selected roof covering.
What does the site demand?
Snow, wind, rain, sun, exposure, and local code can change the final roof system. Carry these site questions into the local design and permit conversation.
Local handoff
Questions worth confirming before buying.
Take these questions to the relevant authority, product manufacturer, supplier, contractor, or qualified design professional.
- 01
Final roof system
Confirm the approved structural system, member design, support conditions, connections, deck, and all relevant loads with a qualified local source.
- 02
Covering compatibility
Confirm the selected covering’s permitted slope, underlayment, flashing, ventilation, edge details, and manufacturer installation instructions.
- 03
Drainage and discharge
Confirm where runoff, gutters, or other drainage features are allowed to discharge and how they interact with the finished grade and foundation.
- 04
Height and local rules
Confirm zoning, setbacks, height limits, wind or snow requirements, and permit obligations before buying roof materials.
Avoid false certainty
Common ways a planning decision becomes a site problem.
- Choosing a pitch because it looks familiar without checking runoff, height, product limits, or local weather.
- Using a planning roof pitch to infer rafters, trusses, spacing, or connections.
- Ignoring where water lands after it leaves the roof.
- Selecting a roof covering without confirming its complete manufacturer-required system.