NJ homeowners complain about abnormally cold floors and drafts at the basement edge as soon as winter sets in. Many homeowners think they just have to live with it, blaming the weather for the cold floor. In reality, winter makes the floor cold, but not freezing. It’s normal to grab socks to cover your feet in winter, but if you need an extra pair to keep your body heat normal, then it’s a problem you need to pay attention to. Whenever you experience cold air currents circulating in your home and making the whole area chilly, the main culprit is the rim joist. Every NJ homeowner must understand what a rim joist is and why rim joist insulation matters.
Why Cold Floors and Drafts Start at the Basement Edge?
Do You Have Cold & Drafty Floors?
Below are 4 main reasons cold floors and drafts start at the basement edge.
Uninsulated rim joist
The rim joist, also known as a band joist, is an integral part of a wood structure located at the top of your foundation wall. The band joist rests on the ground level; therefore, this wooden framing member is exposed to outside elements. A rim joist without a thermal barrier or insulation lets cold air into the home and can make the area freezing. As wood ages and dries, it shrinks, creating a gap between the foundation and rim joist. Many NJ homes have uninsulated rim joists and fibreglass batts. The problem with fiberglass is that it doesn’t stop airflow since there is no air filter; cold air passes throughout the space, causing cold floors.
The Stack effect
The Stack effect pulls cold air up from the crawl spaces because warm air escapes through the roof. Your house pulls cold air inside to balance the pressure between the cold and warm air. This stack effect causes drafts in the room at the basement edge. Uneven room temperature and cold floors are due to this warm air leaking out through the attic. Common air entry points include gaps around plumbing, cracked crawl space doors, unsealed foundation vents, uncovered dirt or gravel floors, and uninsulated floor joists.
Concrete
Concrete is a thermal conductor. Concrete absorbs cold outside air and then conducts it inward and downward. Your indoor heating system produces warm air, but it hits the freezing concrete and uninsulated rim joists and quickly cools down. As a result, you experience chilly air at the basement edge.
Gaps in Utilities and Sill Plates
Utilities enter the home through the edge of the basement. Holes drilled for electrical wiring, HVAC lines, gas lines and outdoor utilities are uninsulated. Even the connection between sill plates and foundation isn’t airtight. These holes and gaps let cold air pass through the basement edge into the home, causing drafts in rooms.
How to fix Cold floors and Draft start at the basement edge?
You can fix cold floors and draft start at the basement edge with Rim joist insulation.
This insulation helps you keep your house and floors warmer and provides energy efficiency. Insulating the rim joist prevents air leaks and drafts, which are a major cause of cold floors. Insulation keeps energy in your home and helps keep room temperatures even. Experts typically install rim joist insulation alongside air sealing and attic insulation. This practice ensures an airtight seal so energy can’t escape from the basement.
Fiberglass insulation vs spray foam insulation
Most older NJ homes have fiberglass batts as insulation, but they are not an accepted standard for rim joist insulation. Fiberglass is permeable, so it allows outside elements to contact the rim joist and other parts of the home. When insulation is impermeable, condensation reaches the rim joist and causes mold growth in the basement. Mold and condensation directly impact your home’s foundation and cause damage.
Spray foam and rigid foam are the best types of rim joist insulation because both are air-impermeable. Spray foam is used to insulate the rim joist because it expands to fill gaps and hard-to-reach areas. Closed-cell spray foam is an excellent air and thermal barrier, so it helps keep energy inside and prevents leaks. Spray foam is waterproof and therefore an excellent choice for insulating basement areas where water and exterior damage are common.
What are the benefits of Rim Joist Insulation NJ?
The 3 benefits of rim joist insulation are listed below.
- Comfortable home: Rim joist insulation eliminates the biggest issue of cold floors and drafts at the basement edge. NJ homeowners enjoy comfort at home as temperatures remain even throughout the home. There will be no dramatic discomfort during peak season. You don’t need to wear an extra pair of socks and gloves to deal with cold floors and spots in winter.
- Energy efficiency: Rim joist insulation makes your home energy efficient. Insulation seals the problematic areas and gaps that cause energy leaks. Your heating and cooling system doesn’t have to work extra hard because your home stays at a stable temperature. You waste less energy and keep your bills as low as possible.
- No unwanted visitors: Basement rim joist insulation and air sealing ensure there are no small gaps or entry points for bugs, critters, and pests. Rats and mice escape the cold winter through these gaps and holes. Insulation eliminates these entry points, helping keep your home space free of these unwanted visitors.
