- Locate and determine the pathways that plumbing, wiring, heat runs, air return runs and gas lines take through the enclosed floors. Also, determine any recessed light fixtures in these floors or in nearby floor areas which share the same joist cavities. Make sure the installation of insulation will not damage or in any way obstruct the usual working of those services. In some cases, cavities or groups of cavities may have to be left uninsulated.
- Insulation should be blown into enclosed floors to capacity.
- When the drill and plug method is used on the garage ceiling, the holes must be plugged and finished with a spackle-type compound flush with the ceiling.
- When the drill and plug method is used on exterior floor overhangs, the holes must be plugged and finished with an exterior wood filler flush with the exterior surface
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- Floor Insulation – Application Guideline