Template:ROOFTOP EQUIPMENT & WALKWAYS (BUR)
Template:ROOFTOP EQUIPMENT & WALKWAYS (BUR)
Walkways and Warning Zones
The use of a minimum 2 mm SBS modified bitumen granular cap sheet in lieu of roofing gravel, at least under the deck-walkway supporting members (sleepers), is required. The cap sheet must extend a minimum of 75 mm (3") on either side of the supporting member. Ensure that no roofing gravel enters the system in this area. This cap sheet may be used in lieu of gravel under the entire deck or walkway area.
The use of organic felt (No. 90) cap sheet in this application is not acceptable.
The cap sheet in a modified bituminous membrane system (BUR) is to be installed either in a full mopping of asphalt or torched to the pour coat. Sleepers must not obstruct drainage, and must be notched or made discontinuous to provide flow to drains.
NOTE: The type and performance of any walkway material is specifically excluded from the RoofStar Guarantee, as is any detrimental effect the walkway materials may have on the roof system.
When primary roof membranes of contrasting colour are used for warning zones, membrane end lap off sets and ply side lap directions must be maintained. Staggered membrane end lap offsets may be positioned below primary roof membranes that are used for warning zones.
Where walkways are employed, they must be designed to facilitate drainage of water. To promote drainage, use accepted concrete-topped XPS insulation panels, or pavers located on purpose-made XPS insulation panels. When pavers are used as the walkway material, they must be spaced no closer than 3mm (1/8″) and must be supported by non-abrasive pads or proprietary pedestals providing a minimum of 12.5 mm (1/2″) of vertical separation layer for airflow and levelling. The choice of pedestal or drainage layer type is the responsibility of the design authority. Pedestals provide airflow for drying surfaces and assist in leveling. They should not impede the flow of water or air, and should uniformly distribute the dead load of pavers and predicted live loads.
A design authority or membrane manufacturer may specify a proprietary walkway protection system or warning zone membrane over the primary roof membrane. Walkway and warning zone materials are not part of the roofing membrane assembly but are typically accessory products that are placed over completed roof membranes. Subsequently the type and performance of any walkway or warning zone material is specifically excluded from coverage under the RoofStar Guarantee, as is any detrimental effect the materials may have on the roof system.