The easiest method is to push the quilt-like insulation into the spaces between the beams from below. This is supported by a net glued in place. To provide additional insulation, a wood fiber plate with a tab and groove can be attached to the underside of the beams. When insulating floors above unconditioned garages, first seal off all possible sources of air leaks.
This strategy has the additional benefit of minimizing the hazard of contaminants (from automotive exhaust gases, paint, solvents, garden supplies, etc.) Also install an air barrier to prevent cold garage air from short-circuiting the insulation underneath the subfloor. The main reason you don't need floor insulation is simple. The floor does not belong to the building envelope. Sometimes, adding insulation to the floor can cause problems in your home.
Floor insulation can hinder the dynamics of vapor barriers and thermal resistance. Most homes with hardwood floors use subflooring to add a layer of insulation between the subfloor and the floor. Therefore, materials that act as insulators, namely rigid foam, plastic foam, silicone, fiberglass or rubber, are used to prevent the surface from cooling in winter. If your second floor is above a cold, unheated area, such as the garage, for example, spray foam will take care of cold floors that are uncomfortable in winter.
The floors of older houses often allow heat to escape, but thankfully effective floor insulation can stop this and reduce humidity. If you have or will have an unventilated mezzanine, it's best to seal and insulate the foundation walls rather than the floor between the mezzanine and the house. When floors include a DPM and show no evidence of moisture, placing a driftwood floor or thermal base with a carpet on top is often the easiest way to improve their thermal performance. When concrete floor slabs have replaced previous floors in older homes, they may include a moisture-proof membrane (DPM), but, unless they were placed relatively recently, they may not be well insulated.
Having a small space under your house can make your home colder in winter than a house built on a concrete slab. Yours may be an old house with traditional solid floors and, if this is the case, they may be slightly damp, since the tiles, bricks or flags that form its surface are in direct contact with the floor below. Knowing how to insulate a floor based on its type is essential, but proper floor insulation will mean that you and your family will enjoy a lot of benefits, so it's worth it.
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