4.1301.14 Above-Grade Exposed Floor, Non-Joisted Assemblies (e.g., Pre-Cast Concrete, Poured in Place, Metal Deck)

Topic:

Floors

Subtopic:

Accessible Floors

Desired Outcome:

Maintain a consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow between conditioned and unconditioned space to prescribed R-value; insulation protected on the bottom side by a weather-resistant barrier

For supporting material, see Referenced Standards.

Multifamily Homes

Title	Specification(s)	Objective(s)
4.1301.14a Pre-inspection	Conduct pre-inspection in accordance with SWS 2.0100.4 Work Area Inspection and Stabilization Gaps, cracks, and holes in fire separations located within the work area will be visually identified and incorporated into air sealing work scope, including those that span two conditioned or unconditioned spaces Where drawings are available that identify specific fire-resistance ratings (i.e., 1 hour, 2 hour), materials and methods will be employed to preserve or restore such rating Where drawings are unavailable or do not identify specific fire-resistance ratings, the fire-resistance rating of the assembly may be inferred from the current construction (i.e., single 5/8 sheetrock, concrete masonry unit), and materials and methods employed will be consistent with restoring or preserving such inferred fire-resistance rating Repairs necessary to stabilize work areas and protect or preserve integrity of energy improvement will be completed before subject work begins	Ensure and preserve integrity of fire separations Provide a safe and stable work environment
4.1301.14b Preparation	Health and safety concerns will be addressed for occupants, workers, and repair materials in accordance with OSHA OSHA U.S. Occupational Safety and Health Administration, www.osha.gov standards ( OSHA OSHA U.S. Occupational Safety and Health Administration, www.osha.gov 1926, 1910) Prepare and isolate the area in accordance with health and safety standards for the application and materials (e.g., extreme temperatures, lead, asbestos, carbon monoxide) Work lighting, work platform, and adequate ventilation will be provided	Provide a safe working environment Provide a safe indoor environmental quality working environment Provide effective repair access
4.1301.14c Subfloor preparation	Sealing between conditioned space and unconditioned space or exterior will be completed before insulating	Ensure airtight floor assembly
4.1301.14d Installation	Insulation will be installed to prescribed R-value Insulation will be installed in contact with bottom of the floor decking without gaps, voids, compressions, misalignments, or wind intrusions If vapor retarders are used, install consistent with local climate/code requirements	Prevent potential fire chases Provide effective R-value Prevent excessive vapor migration into the floor assembly and/or conditioned space
4.1301.14e Installation of batts	Batts will be installed continuously All perimeter joints will be sealed to the floor deck	Minimize convective loops Minimize sagging, gaps, and voids Protect batts from weather
4.1301.14f Installation of rigid insulation	Rigid insulation will be installed continuously and mechanically fastened to the bottom of the floor deck Where rigid foam plastics are used, in no case will the final thickness exceed the manufacturer's tested thickness used to determine the maximum 75 flame spread and 450 smoke-developed index when tested to ASTM ASTM ASTM International, www.astm.org E84 or UL UL Underwriters Laboratories 723 Foam will be provided with ignition and thermal boundaries, as required by code	Minimize convective loops Minimize sagging, gaps, and voids
4.1301.14g Installation of spray polyurethane foam ( SPF SPF Spray polyurethane foam )	SPF SPF Spray polyurethane foam will be applied continuously to bottom side of floor deck, per global section for application of SPF SPF Spray polyurethane foam Where rigid foam plastics are used, in no case will the final thickness exceed the manufacturer's tested thickness used to determine the maximum 75 flame spread and 450 smoke-developed index when tested to ASTM ASTM ASTM International, www.astm.org E84 or UL UL Underwriters Laboratories 723 Foam will be provided with ignition and thermal boundaries, as required by code	Minimize convective loops Minimize gaps and voids
4.1301.14h Installation, if mechanicals are below the floor deck (applies to all insulation types)	All plumbing and ductwork will be enclosed within the insulated space and will have sufficient insulation on the exterior side	Prevent freezing of plumbing pipes
4.1301.14i Weather-resistant barrier	A weather-resistant barrier will be applied to the weather side of the insulation (e.g., exterior insulated finishing system and spray-on roof waterproofing over foam)	Protect insulation from weather, light and impact
4.1301.14j Property manager education	A dated receipt signed by the installer will be provided that includes: Coverage area Thickness R-value	Document job completion to contract specifications Confirm amount of insulation installed Comply with 16 CFR 460.17