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Should you put insulation between floor joists?

Floor Insulation for Moderate Climates The best solution is 6 inches thick, R-19 fiberglass batts installed between floor joists. It's easier on the pocket and long-lasting as well. It not only protects the floor but also prevents moisture and mold. Here's what you need to do.

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Crawl Spaces are constructed as mini basements. However, they are becoming rare for new home construction in the USA and Canada. Crawl space is often damp, moldy, and inhabited with pests. It must be kept dry, safe from humidity, and tightly sealed to be pest-free. This will ensure durability and indoor air quality. Crawl spaces should have their floors uninsulated, ground fog and air sealed, walls insulated and air-conditioned with indoor air. You may find no insulation at all if your home is built before 1990. The U.S. Dept. of Energy currently suggests insulation with an R-value of at least R-9 in floors. So the answer to the question should a crawl space be insulated is yes, they most certainly should be. However, several things should be kept in mind. This article will provide you an insight into how to deal with moisture and heat loss. And what floor insulation is suitable for which climate conditions.

Floor Insulation for Moderate Climates



If your local winter temperature is seldom below freezing, you need not worry. The best solution is 6 inches thick, R-19 fiberglass batts installed between floor joists. It's easier on the pocket and long-lasting as well. It not only protects the floor but also prevents moisture and mold. Here’s what you need to do. Firstly, install fiberglass batts in such a way that they face the underside of the floor. Use wood lath after every 18 inches to provide the best support. Avoid stay rods, so they don’t lessen its insulation value.

Hire a Professional

Further, consult an insulation contractor to calculate the amount of ventilation your crawl space needs. Cut in new vents if needed. Seal the holes for electrical wiring and plumbing with spray foam. Make sure you insulate plumbing pipes and ducts to block heat loss and freezing. For thermal and moisture protection, use closed-cell spray foam. It’s a bit costly, but it is the only alternative to fill out space between truss-type joists. Avoid open-cell spray. Clean Air Doctors provide crawl space insulation in Chicago, IL. They have technicians trained to handle any Insulation project regardless of the temperature and Crawl space type. The professional contractors at Clean Air Doctors can help you determine which type of insulation is suitable for your home, and what R-factor will help you get the best results.

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How thick should floor joists be?

Individual Components. The bulk of the floor's thickness comes from the joists, which are the horizontal beams that carry the floor's weight. Joists in home construction are usually made with 2-by-10 or 2-by-12 lumber, which are 9 1/4 and 11 1/4 inches deep, respectively.

The bulk of the floor's thickness comes from the joists, which are the horizontal beams that carry the floor's weight. Joists in home construction are usually made with 2-by-10 or 2-by-12 lumber, which are 9 1/4 and 11 1/4 inches deep, respectively. The subfloor -- the material that covers the joists and serves as the base for the finished floor -- can be 5/8 inch to 1 inch thick, depending on the type of flooring and subflooring used and how far apart the joists are set. Allow another 1 to 2 inches for the combined thickness of the finish materials on the ceiling, usually drywall, and the floor -- such as carpet and pad, hardwood or vinyl and underlayment. Put it all together, and you're in the range of about 12 to 14 inches.

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