For a low slope residential roof there are two main options.
Low slope roof treatments and walking surfaces.
Boards of extruded polystyrene insulation are simply laid over the rubber a protection fabric is unrolled over the insulation and gravel is spread at the rate of 10 15 lbs per square foot.
Osha walking working surfaces standard low sloped roof fall protection defined.
Selection of a roofing membrane for these roofs is a very important decision for building owners.
Low slope roofing is classified as applying a water impermeable or weatherproof roofing membrane to a roof sloping less than or equal to 14 degrees.
A low sloped roof is defined as a slope equal or less than a ratio of 4 to 12.
Research low slope roof treatments and walking surfaces that would allow human traffic.
Low sloped roof is a term that osha felt it needed to be defined in its walking working surfaces update published november 18 2016.
Residential low slope roofing can generally be divided up into two broad categories.
In your engineering notebook document three products that could be used as a walking surface on the green roof planned for the lower roof of the keystone library.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.
At above left is an example of an awkward roof hatch access onto a walk on low slope roofing.
Then apply standard asphalt shingles over the membrane.
Access is necessary for hvac system maintenance roof drain maintenance etc.
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.
Notice also the black roofing mastic patching around the rooftop hvac ductwork i expect there have been leaks into the duct system and possible mold contamination therein.
But in some climates such as areas of deep snow cover the property owner may prefer to convert to a more steeply sloped roof structure a procedure we describe at low slope roof conversion 3 4 5.
As a result osha estimates the new rule will prevent 29 worker deaths and 5 842 lost workday injuries each year.
This year osha made updates to its walking working surfaces standard for general industry in an effort to bring fall protection requirements more in line with those for the construction industry.
Slope is calculated by rise over run thus a low sloped roof is a roof where for every 12 units inches feet or meters measured horizontally run the roof does not increase or decrease by.
Include sketches or images of each product.
Gravel can be applied over a rubber membrane to reflect heat and to provide an inexpensive means to insulate a low slope roof.
