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Moisture Control | Roof Decks | Rigid Insulation | Roof Membranes

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Electrical Conduit Precautions
Electrical conduit or other piping shall not be installed on top, within or directly beneath roof decks. Do not conceal within the roof assembly electrical conduit or other piping due to the danger when roof systems are being mechanically attached to the deck. Furthermore, if conduit or piping is embedded within the roof system, it is concealed from view for inspection and maintenance. Dangerous situations can also result during removal of the roof system at the time of future reroofing. Special hangers shall be installed to suspend conduit well below the roof deck so mechanical fasteners do not penetrate the conduit.

Common Types of Roof Decks
1.

Cement and wood fiber panels

2.

Lightweight insulating concrete

3. Poured gypsum concrete
4. Precast gypsum panels
5. Steel panels
6. Structural concrete
7. Thermosetting insulation fills
8. Thermosetting insulation fills

Cement & Wood Fiber Panel Decks
Cement and wood fiber panels are composed of treated wood fibers that are bonded together with cement and other binders compressed, and molded into panels. These panels provide structural support as well as acoustical and thermal insulation. The panels are available with tongue and groove joints for installation directly over joists, and with rabbeted joints for use over sub purlins or bulb tees.

High Humidity Areas: Cement and wood fiber deck panels shall not be installed on buildings anticipated to have high relative humidities.

Design Requirements: Cement and wood fiber roof decks shall be designed and installed according to the manufacturer's specifications. The designer shall also specify the storage, handling and installation of cement and wood fiber roof deck panels. The specifications shall require that the joints between adjacent panels be less than .25" and be grouted or filled with compatible material recommend by the manufacturer. Voids around bulb tees shall be grouted with material specified by the deck manufacturer.

   


Structural Requirements:
Wind uplift resistance shall be provided by one of the following fastening techniques:

1.

Clips, screws, or nails fastening the deck directly to the building's framing system.

2.

Sub purlins that are secured to the roof framing system.

Vertical Alignment: Adjacent cement and wood fiber deck panels shall be aligned horizontally so as to provide a uniform substrate for the roof system. The maximum allowable difference in elevation between adjacent panels is .125". Uneven joints up to .125" maximum shall be grouted, with the grout feathered to a slope of .125" per foot.

Weather and Temperature: Installation of cement and wood fiber roof decks shall be scheduled to coincide with weather and temperature conditions that allow for the correct installation of the panels. If panels are damaged or deteriorated from weather exposure, they shall be replaced prior to installation of the roof system.

Additional Insulation & need for a Vapor Retarder: Even though cement and wood fiber panels provide some insulation value, additional insulation may be required for more thermal resistance. When additional insulation is specified, the dew point shall be calculated for the roof system, and a vapor retarder shall be correctly placed within the system.

Insulation Board Attachment to Deck: Rigid insulation boards shall be mechanically attached to cement and wood fiber panel roof decks. Direct adhesion of insulation boards to wood fiber roof decks is prohibited. However, insulation may be adhered to a base sheet mechanically fastened to the deck. Specialty fasteners may be required for attachment of the base sheets. Designers shall consult with the deck and insulation manufacturers for the correct type and quantity of fasteners.

Roof Membrane Attachment to Deck: If no rigid insulation is specified, mechanically attach a UK5 KraftFelt and a Fields base sheet to the deck before installing the BUR membrane so as to prevent possible asphalt drippage, and to reduce future stresses on the BUR membrane.


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Fields Company LLC
2240 Taylor Way,
Tacoma WA 98421

Phone:
800-627-4098
Fax:
253-383-2181
email:
sales
customer service

 

 

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