Miniumum Slope For Flat Roof Climate Zone 7

Per foot would be acceptable.

Miniumum slope for flat roof climate zone 7.

Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. The 1 in 12 is significantly more than the commonly specified 1 4 in 12 and reflects the need of an increased slope to promote free drainage. Minimum metal roof slope depends on the roof profile building design climate and site location. That table calls for a minimum of r 5 foam for climate zones 1 through 3 r 10 for climate zone 4c r 15 for climate zones 4a and 4b r 20 for climate zone 5 r 25 for climate zone 6 r 30 for climate zone 7 and r 35 for.

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. The minimum slope the code allows is in 12 in.

2 heating system capacity 17 000 btu hr 5 kw and a heating thermostat set point that is restricted to 50ºf average wall and roof u factor 0 200 in climate zones 1 5 and 0 120 in climate zones 6 8 comply with the roof solar reflectance and thermal emittance provisions for. This means that even less than the minimum of in. Equipment power totaling 7 watts ft. One of the best ways to insulate a roof whether sloped or flat is to install rigid foam on top of the roof sheathing.

This is the basis for calculating the angle which is approximately a 1 19 degree slope. Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed. In general the minimum slope for a flat roof is 1 0 but as stated earlier this is only possible in theory. Additionally asce 7 16 requires a minimum 1 in 12 roof slope to promote free drainage for secondary members parallel to a free drainage edge.

If these issues are addressed during the design stage and the roofing contractor does his job these systems will almost always perform as intended. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. If 75 of your roof meets the exception criteria you also don t have to comply. Roof reflectivity provisions in iecc only apply to buildings in climate zones 1 3 that have a slope less than 2 12 and are directly above a cooled space so any areas that are heating only don t have to comply.