There’s always the option of sloping the roof framing entirely but that’s usually over-complicating things.On small jobs, ripping down 2x4s into wedges and nailing them to the joists is probably more cost-effective.On larger roofs, it’s probably cheaper to use tapered foam insulation on top of the roof sheathing. This modest slope can be achieved in a number of ways: Flat roofs are built with a slight pitch of at least 1/8″ per foot so water can drain – either to centralized drains, scuppers, or a gutter system. Rainwater discharge: Contrary to its name, a flat roof isn’t actually flat. Just don’t forget to determine if your roof needs to be vented. It can be batt insulation, spray foam insulation, rigid board insulation or SIPs. Insulation can be located between ceiling joists or above the roof sheathing. This flexibility in design allows for more opportunities on how the ceiling can be detailed and if the framing members are concealed or exposed. It can be framed like a floor system with horizontal framing members at 16″ 19″ or 24″ o.c. Depending on the span, many different materials can frame a flat roof: 2x framing, wood joists, timber framing, laminated beams, steel, concrete, or SIPS. They can even be accessible, unlike other roof styles, providing additional living space and used for viewing platforms displaying panoramic views of the surrounding landscape.įraming & Insulation: Flat roof framing is relatively straightforward. They can be planted to create usable vegetated gardens and green roofs. Flat roofs create long horizontal planes, reminiscent of the broad horizon line seen often in nature. They’re simple in form and function, and are a good example of the modernist principle of “clean lines”.įlat roofs can cantilever into daring overhangs for shade protection and solar gain control. Uses & Benefits: Modern architecture has traditionally been characterized by flat roofs.
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