Given to each sub floor or group of sub floors. If two or more have the same characteristics, they can be entered together under one name. The area would then be the sum of the areas of the individual sub floors. A house with a combination of sub floors (e.g. a partial basement and crawlspace) must have two sub floor names.

There are four sub floor types:

• Basement: A space below the house generally used for storage, housing of HVAC equipment and its distribution system (ducts or pipes). Only walls exposed to the outside are to be considered, not walls shared with neighbors or adjacent sub floor structures. Basement windows are assumed to be small and are not considered for retrofit.  If they are large, and if the basement is heated and/or cooled, the above-grade part should be input under walls, windows, etc. and only the below-grade walls and the floor should be input as sub floor
• Crawlspace: A space below the living space with floor-to-ceiling height of less than 5'6", with exposed or partially covered earth as a floor, at the same level as outside grade. Crawlspaces are assumed to be vented to the outside.  As for basements, only walls exposed to the outside are to be considered.
• Slab-On-Grade: A slab of reinforced concrete directly supporting the living space. When measuring the perimeter, do not include any shared walls, e.g. with the garage or the house next door.
• Platform: The living space is elevated above the ground, as in a mobile home, and the space beneath the platform is, without protection, open to the elements.

The type of insulation placed in the ceiling of the sub floor.

The depth of base insulation.

The area of the floor above this sub floor space.

Holes caused by furnace registers, wiring, plumbing, electrical outlets, dryer exhausts, cracks, and similar openings. Each adds to the leakage area and heat conduction.

Any floor insulation is assumed to be on the ceiling of the subfloor. That is, it is between the heated space above and the unheated space below. The BASE INSULATION is the type of insulation placed in the ceiling of the subfloor.

There are Above Grade Walls are in basements and crawlspaces. Wall insulation Thickness is the thickness of any insulation between furring or boards and the foundation wall.

The height of the exposed wall, basement doors, etc. Usually, this will be the height from grade level to sub floor ceiling. However, if a "well" is dug around a portion of the foundation, exposing doors and/or windows, this should be the depth of this well.

The total length of above-grade walls or slab edge that are exposed to the outside.

Enter total number of windows. This value, entered for calculation of air leakage through the base, should be consistent with the number of windows entered in the window component.

Enter total number of doors for the basement. This value, entered for calculation of air leakage through the base, should be consistent with the number of doors entered in the door component.

Number of leaky holes caused by furnace registers, wiring, plumbing, electrical outlets, dryer exhausts, cracks, and similar openings, between the conditioned building and an unconditioned basement. Each adds to the leakage area and heat conduction.

Measures the outside air that leaks into the heated space of the building. Thus, if there is a basement, it is the air that leaks into the basement and then from the basement into the heated portion of the building. Estimates of leakage of air through the base are used to calculate the current air infiltration for the building.

If you wish to seal some basement windows, indicate their area and the change in R-value as a result of the sealing

A result of the sealing to be carried out.

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