Ventilation

Unventilated crawl spaces and ventilated crawl spaces are the two types of crawl spaces that can be found in a home. Each type of crawl space requires a different type of insulation. While the end result may differ, the ultimate goal remains the same: to enclose the space in some form of thermal envelope.

If a crawl space is not ventilated, is it still necessary?

The installation of working vents in the crawlspace is generally required by building codes to allow outside air to circulate under the floor in the summer to prevent moisture buildup, which, among other things, promotes the growth of mildew and mold, as well as the rot of wooden floor and wall surfaces.

What is the best method of ventilating a crawl space that has been encapsulated?

It is critical to allow for proper ventilation of the crawl space from the outside. Venting a portion of the supply air from the HVAC system into the crawl space will assist in lowering humidity levels. In addition to other methods, such as the use of an exhaust fan to move air from the crawl space to the outside, Home dehumidifier installation is a good idea (encapsulation).

Is it necessary to ventilate a crawl space that has been encapsulated?

Crawl space air that has been encapsulated is required to be handled in one of two ways, according to the International Building Code (IRC 2009, Section 408.3): either (1) by a mechanical system alone, or (2) by a mechanical system and another mechanical system the installation of a mechanical exhaust ventilation system that operates continuously at a rate equal to 1 cfm for every 50 ft2 of crawlspace floor area and incorporates an air pathway to the common area.

Is it better to have a crawl space that is partially ventilated or one that is completely sealed?

Crawl spaces should be treated as if they were a part of your living space, which means they should be sealed, insulated, and kept free of moisture as much as the rest of your home. Because your crawl space contributes so much to the quality of the air you breathe in your home, the vast majority of contractors today agree that it should be treated as if it were an extension of your living space.

Can I cover the vents in the crawl space if I don't want to use them?

Sealing the crawl space, according to building scientists, can help prevent mold and mildew growth, increase the warmth of the floors, and reduce heating and cooling bills by as much as 30 percent.