Roof Construction Details Low Slope Roof On Posts

By low slope roofing we mean any roof that is pitched at less than 4 inches of rise in 12 inches of run or 4 12 pitch.

Roof construction details low slope roof on posts.

1 3 5 design pressure coefficients for roof zones. Then apply standard asphalt shingles over the membrane. Can metal roofing be used on a low slope pitch roof. We often hear low slope roofs referred to as flat roofs but no roof should be dead level.

Insulation itools quick and easy online tools and calculators that can help you determine your insulation needs as well as how much you could save. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Roof design wind pressures are determined using the wind speeds at the mean roof height of the building i e average of the eave and ridge heights. Ceilings product comparison tool.

Designers and specifiers should pay close attention to roofing details in these areas and. The closer a roof is to level the more likely sagging rafters will make a pond. Regular asphalt shingles and standard skylights will work at pitches of 4 12 or greater but at lower pitches you have to use different materials. Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically from steep slope to low slope on the same structure.

1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. An adequately pitched roof with a sagging middle will still slope enough to drain. For buildings with low slope roofs less than 2 12 slope the wind speed at eave height is used. Residential low slope roofing can generally be divided up into two broad categories.

These critical junctures account for the majority of roof leaks. The most critical application points on low slope roof systems are at flashings penetrations and accessories. Problems at these points typically arise from improper application methods and the use of inappropriate or incompatible materials. Sunday august 5 2018 the traditional metal roof types such as 5v crimp shown above and corrugated are rated by the manufacturers for use down to a 3 12 pitch three inches of vertical rise for every foot of horizontal run.

That includes soldered metal roofing or synthetic membranes. For a low slope residential roof there are two main options.