Roof Construction Details Low Slope Roof On Posts

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.

Roof construction details low slope roof on posts. That includes soldered metal roofing or synthetic membranes. 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. 1 3 5 design pressure coefficients for roof zones. For a low slope residential roof there are two main options.

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. The closer a roof is to level the more likely sagging rafters will make a pond. 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. Roofs peel off from the edges so it is critical to hold them tight with the roof deck sealed on the outside we turn to flashing the edges with metal and membranes metal drip edge flashing image details roofing wrb flashing.

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. For buildings with low slope roofs less than 2 12 slope the wind speed at eave height is used. Problems at these points typically arise from improper application methods and the use of inappropriate or incompatible materials. Ceilings product comparison tool.

1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. These critical junctures account for the majority of roof leaks. The membrane will outlast the shingles and seal around all nail penetrations. An adequately pitched roof with a sagging middle will still slope enough to drain.

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. 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. Can metal roofing be used on a low slope pitch roof. The most critical application points on low slope roof systems are at flashings penetrations and accessories.

Then apply standard asphalt shingles over the membrane. A comprehensive roofing specification writing tool allowing users to quickly write accurate steep and low slope roofing specifications for job submittal packages.