Floor

Common Problems with Insulation in Cantilevered Floors
For exposed / cantilevered / overhanging floors, with a conditioned space above and outdoor space below, rock wool or foam board are sometimes used. They can have the following issues:

  • Insulation sags over time and there may be gaps around penetrations and joints, reducing thermal insulation against designed values.

Common Problems with Insulation in Floors Between Conditioned and Unconditioned Spaces
For floors between conditioned and unconditioned spaces, rock wool or foam boards are sometimes used. They can have the following issues:

  • Insulation sags over time and there may be gaps around penetrations and joints, reducing thermal insulation against designed values.
  • Noise penetration between noisy unconditioned spaces such as parking garages and plant rooms, and conditioned spaces.

Reasons Spray Foam for Floor Insulation
Floors may be insulated using spray foam insulation for the following reasons:

  • Spray foam insulation can be used to avoid energy loss from conditioned spaces.
  • Foam light density spray foam insulation, and to some extent medium density spray foam, can reduce airborne and flanking noise.