Low Slope Roof Framing

When design constraints necessitate a 1 4 in 12 design slope be used the framing members should be cambered or investigated for ponding.

Low slope roof framing.

Just like any other roofing system low slope roof designs will have several effects on the overall construction of the building including the interior volume the style and design of the house the drainage system and the material used for covering. It s constructed of a durable reinforcing mat of non woven glass fibers that have been coated and permeated to a thickness of approximately 2 0 mm. Standing water is a primary source of roof cover discoloration and deterioration that may result in framing member damage and contribute to premature failure of the structural system on low slope roofs. Very little to no wind force but very slow to shed snow or rainwater.

Pitch is the amount of angle or slope the roof has. A low slope roof design typically has a pitch of between 2 12 and 4 12. Venting requirements and detailing approaches to providing appropriate venting paths will be covered for roofs with attic insulation. This is denoted two ways a 1 3 or 1 4 pitch in fractions and a 6 12 pitch in inches which means the roof rises 6 inches for each 12 inches of run.

For lower pitches a built up or continuous roll roofing must be applied to keep the roof waterproof. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many. May require a special drainage system. Less wind force impact but sheds snow rain and debris slowly.

Use prefabricated mono trusses for the easiest and best framing on a single slope roof. For a low slope residential roof there are two main options. Flat low slope and steep slope a gambrel is a combination of a low and steep slope. Get on a ladder with a tape measure.

Mark truss locations on the front and back wall caps of the structure. Flat roof has a slope of 2 12 or less it is usually covered with metal or a membrane. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch. Differences associated with roofs having continuous insulation on top of the deck will also be reviewed as will methods for ensuring.

Moreover low slope metal roofs are not prone to the degradation experienced by organic materials enabling these roofs to better resist the elements. Measure the outline of the structure to be roofed. On low slope wood frame roofs. Low slope has a slope between 2 12 and 4 14 is usually covered with rated shingles or steel.

2 where the roof is not visible consider upgrading to a single ply roofing intended for low slope roofs.