c) 1 ½ in. the area is 16'x20' range and he made into 4 section, 16'x5' each. If the occupied roof had other items, such as toilet rooms, storage rooms, cabanas or shade trellises, this would become an additional story to the building. d) 2 in. However, the electrical code provides some guidance regarding electrical cables, raceways and boxes placed in or under roof decks. Electrical code NFPA 70: National Electrical Code® (NEC) serves as the elec- The International Energy Conservation Code (IECC) is of particular importance to low-slope roof design due to its R-value requirements, which affect the amount of insulation that has to be included in roof assemblies. Minimum Insulation R-value Requirements by State: Non-Residential, Above Roof Deck. The fastening rate of deck to trusses of 16 inches on center (o.c.) The fastening rate of deck to trusses of 24 inches o.c. Some products meet either one or the other requirements - with walkable roofing membranes it is important the product meets building code for … below roof decks. What you will notice from this checklist is that there is not really a specific This matrix provides the minimum insulation R-values … Clarifying the Building Code Specifics for a Walkable Vinyl Roof Deck Membrane - when a roofing membrane also serves as a walking surface - AC39 & AC75. or less is one fastener every 4 inches o.c. A cable, raceway, or box installed under metal-corrugated sheet roof decking shall be supported so the top of the cable, raceway, or box is not less than _____ from the lowest surface of the roof decking to the top of the cable, raceway, or box. In many instances, the presence of electrical conduit is unforeseen, problematic and potentially dangerous. b) 1 in. The IBC code further states in Section 1609.5.1 Roof deck, that the deck must be designed and installed in accordance with ASCE 7. Decks are the location of many occupant deaths and injuries, many due to structural deficiencies such as inadequate connections of ledger boards, guards and posts. a) ½ in. or less is one fastener every 6 inches o.c. All of these codes are produced by the International Code Council (ICC). the nails are all sunken under the wood surface. the boards are tight fit(no space) and also tight fit to the edge wood board( the wood board sit on top is metal capping). Code change G136–18 now clarifies that penthouses will include stairways and elevators (with their associated lobbies) that are used to provide access to and from the occupied roof. When new roofing systems will increase the roof load on a building, then the roof deck structure should be evaluated by a structural engineer to determine the existing dead and live load capacity as required by current State building code. I have a flat roof and my contractor built a cedar board floating deck. See answer and applicable Code … Exceptions: As an alternative, self-adhering polymer-modified bitumen underlayment complying with ASTM D1970 installed in accordance with both the underlayment manufacturer's and roof covering manufacturer's instructions for the deck material, roof ventilation configuration and climate exposure for the roof covering to be installed, shall be permitted.