Gravel should be 1 2 to 1 1 2 in size have rounded edges and be thoroughly washed to remove all sand and grit.
Low slope roof treatments and walking surfaces.
At above left is an example of an awkward roof hatch access onto a walk on low slope roofing.
Research low slope roof treatments and walking surfaces that would allow human traffic.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.
Gravel can be applied over a rubber membrane to reflect heat and to provide an inexpensive means to insulate a low slope roof.
Residential low slope roofing can generally be divided up into two broad categories.
For a roof recover that is keeping the low slope structure a roofer may add tapered insulation and then a new roof covering of epdm or other roofing material.
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.
Selection of a roofing membrane for these roofs is a very important decision for building owners.
The membrane will outlast the shingles and seal around all nail penetrations.
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.
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.
Access is necessary for hvac system maintenance roof drain maintenance etc.
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.
Then apply standard asphalt shingles over the membrane.
Include sketches or images of each product.
Osha walking working surfaces standard low sloped roof fall protection defined.
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.
For a low slope residential roof there are two main options.
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.
Low sloped roof is a term that osha felt it needed to be defined in its walking working surfaces update published november 18 2016.
