No, fiberglass insulation does not need an air gap and actually works best when there is no air movement through or behind it. Fiberglass insulates by trapping still air within its fibrous web; any air gap or movement reduces its thermal performance.
Note: Insulation materials like spray foam don't require an air gap. They expand to fill all the nooks and crannies, creating a tight seal that seals air and moisture. For standard ones like fibreglass or mineral wood, follow the manufacturer's guidelines.
Whether you should use faced or unfaced fiberglass insulation depends primarily on the location of the installation and your climate.
It works better with a barrier, but it does help. Air barrier will improve insulation but try blowing out your birthday candles through a piece of insulation. Pretty hard even without an air barrier.
Yes, it matters significantly based on your specific application and climate. Facing acts as a vapor retarder to block moisture. Using the wrong type can trap moisture inside your walls, leading to dangerous mold, mildew, and rotting wood.
Unfaced insulation is a plain batt or roll of fiberglass insulation with no facing. It is Class A fire-rated, which means it can be left exposed, or used in specific fire-rated assemblies. Unfaced insulation can also be used with vapor retarders such as polyethylene or polypropylene (depending on local code).
Yes, mice absolutely love blown-in fiberglass insulation. It provides a soft, warm, and highly structured environment for nesting, tunneling, and breeding.
Yes. Whether or not you need an air gap depends entirely on the type of insulation you are using and where you are installing it.
Buyers often walk away from homes with spray foam insulation because it can cause major mortgage and insurance denials. The foam tightly seals roof spaces, trapping moisture, and covers up structural timbers. This makes it impossible for surveyors to inspect for hidden rot or damage, which can lead to catastrophic repair costs.
The installation instructions for the AmeriVent B-vents we typically install specifically call for a minimum one-inch clearance to both combustible materials and insulation, regardless of insulation type.
Installing fiberglass insulation is an excellent DIY project to improve your home's energy efficiency. The secret to maximizing its performance is getting a snug, "friction fit" in the wall cavity. Never compress the insulation, as crushing it decreases its thermal value. Always orient the vapor barrier (paper or foil side) toward the heated or cooled living space.
Yes, homeowners can add new insulation over existing insulation in most cases. This approach works well for attics, walls, and floors where the current layer remains intact and undisturbed. Building codes and energy experts often support this method to boost thermal performance without full removal.
The healthiest home insulations are natural, zero-VOC materials like sheep's wool, hemp, cellulose, and cork. Unlike conventional options like fiberglass or spray foam, they do not off-gas toxic chemicals or release respiratory-irritating dust, resulting in significantly better indoor air quality.
The most common and effective alternative to a countertop air gap is a high loop drain hose. By routing your dishwasher's drain hose as high as possible under the sink cabinet (fastening it securely to the underside of the countertop) before it connects to the disposal, you use gravity to prevent wastewater from flowing backward.
Yes, the lungs can get rid of fiberglass. Inhaled fibers are naturally expelled through coughing, sneezing, and the body's mucus clearance mechanisms. Furthermore, unlike asbestos, the materials commonly used in fiberglass insulation are synthetic vitreous fibers that macrophages (immune cells) in the lungs can break down and dissolve.
Unfaced insulation is generally cheaper than faced insulation, as it lacks the extra vapor retarder material (kraft paper or foil).
Yes, rodents absolutely love foam board insulation. While it offers no nutritional value, the soft texture is incredibly easy for mice and rats to chew through. They shred it to build warm, insulated nests, and use the boards to create extensive, hidden tunnel systems within your walls.
The cheapest and most effective insulation overall is blown-in cellulose for attics and fiberglass batts for open walls. Both materials provide excellent thermal resistance (R-value) for their price and are widely accessible for both DIYers and professionals.
Banks and mortgage lenders often dislike or outright reject homes with spray foam insulation because it can trap moisture against roof timbers, leading to hidden wood rot, mold, and structural decay. Additionally, the foam conceals the roof structure during valuations, making it impossible for surveyors to assess the roof's true condition.
A dishwasher air gap prevents this from happening by ensuring that the water flows in one direction: out of the dishwasher and into the garbage disposal. If you don't have an air gap, have one installed for enhanced hygiene and plumbing safety.
Insulation materials themselves generally maintain a consistent baseline price year-round, but late fall and winter (November through February) are typically the cheapest times to hire contractors for installation. During these off-peak months, demand drops and contractors are more likely to offer 10% to 25% discounts to secure work.
Each centimetre of air space between the insulation and the surface is equivalent to an additional layer of insulation. This means that a small air gap can significantly improve the R-value (the measure of insulation's ability to resist heat flow) of the insulation.
The Amish control mice through non-chemical, self-sustaining methods, relying on active trapping, natural scent repellents, and structural exclusion. Rather than using commercial poisons, they focus on physical barriers and natural predators to keep rodent populations in check.
The best insulation options that mice generally avoid nesting in are dense, inorganic materials like mineral wool (rock wool), or rigid, sealed products such as closed-cell spray foam and aircrete. These materials are harder to chew, tunnel through, or shape into nests compared to soft fiberglass or cellulose.
In the wild, the number one killer of mice is predation. Natural predators like owls, hawks, foxes, snakes, and feral cats kill vast quantities of mice daily.