No, a radiant barrier does not have its own R-value. R-value measures resistance to conductive heat (heat moving through a solid), while a radiant barrier simply reflects 95-97% of radiant heat away from the living space.
This might surprise you, but radiant barrier foil on its own has virtually no R-Value! This is important to understand because radiant barrier does not take the place of traditional insulation (fiberglass, cellulose, etc.).
Some studies show that radiant barriers can reduce cooling costs 5% to 10% when used in a warm, sunny climate. The reduced heat gain may even allow for a smaller air conditioning system. In cool climates, however, it's usually more cost-effective to install more thermal insulation than to add a radiant barrier.
R60 blown-in insulation provides maximum thermal protection, requiring a depth of 17 to 22+ inches depending on the material. It is designed for top-tier energy efficiency (IECC Zones 6-8) and ensures a heavily insulated, comfortable home. Proper installation, including marking joists, is crucial for maintaining consistent density and preventing settling issues.
Most regions fall into recommendations ranging from R30 to R60, with R49 and R60 representing the higher end of the spectrum. These premium R-values typically make sense in extreme climates or for homeowners prioritizing maximum energy efficiency.
Mice are curious and always searching for safe, snug, and warm nesting sites. Attics filled with blown-in insulation provide an excellent option–from the mice's point of view. As long as there is a ready food source. Mice are omnivorous and will eat and chew on almost anything including wood and electrical wires.
Yes, a radiant barrier absolutely needs an air gap to function. Because it works by reflecting radiant heat, it requires an empty space (void) for the heat waves to travel through. If the barrier touches another material directly, the heat transfers via conduction and the reflective properties are lost.
What time of year is Insulation cheapest?
The healthiest, non-toxic insulation for your home is natural sheep's wool or hemp insulation. These materials contain no chemical binders or formaldehyde, actively regulate indoor humidity to prevent mold, and do not off-gas.
When balancing upfront cost and overall thermal efficiency, the cheapest and most effective standard insulation is fiberglass batt insulation. However, if you are looking for long-term savings through superior air sealing, dense-pack cellulose often provides the best overall value.
R60 insulation is worth it if you live in a very cold climate (like the northern U.S. or Canada), but it is often considered overkill for mild climates. While it maximizes comfort and thermal efficiency, you will experience diminishing financial returns compared to standard R38 or R49 insulation.
Foam insulation is a common target because it's easy for them to chew through. The material offers little resistance, allowing mice to create tunnels or nests within the insulation. But mice aren't just interested in chewing for the sake of it—they're also drawn to the warmth and shelter insulation provides.
To achieve an R-38 insulation value with blown-in insulation, you need between 12 and 17 inches of thickness, depending on the material used.
Most contractors use blown-in, loose fill insulation for attic floors, which is quick and easy to install with the right equipment. Typical materials include fiberglass or cellulose – both contain some recycled content (glass or ground up paper) and are inexpensive and safe.
The best radiant barrier depends on your installation method and climate, but commercial-grade, heavy-duty woven radiant barriers are highly rated for DIY and professional use. The industry standard is a double-sided, perforated, and tear-resistant aluminum foil that blocks up to 97% of radiant heat.
Because spray foam can trap moisture, hide the condition of the roof, make it difficult for surveyors to inspect, which means risks like timber decay, dry rot, and not forgetting increased fire risk. If you've got it or you're buying a property that does, this is something you need to know upfront.
Have HVAC Prices Gone Up in 2026? Yes HVAC prices have steadily increased over the past few years, and 2026 is no exception. These increases are affecting everything from entry-level systems to high-efficiency units, making it more expensive than ever to install or replace HVAC systems.
No, radiant barriers do not damage roof shingles.
Materials that can hinder your chances at peak performance from your attic antenna, however, include metal siding, foil-faced insulation, radiant barriers, brick or other masonry and tile roofing.
Lay the radiant barrier foil loosely over the attic insulation. Do not press it into the insulation. Your insulation will have some peaks and valleys, which is fine. Ideally you want about 10-20% surface contact with the foil.
The Amish rely on natural, low-tech, and self-sufficient methods to manage mice. Because they generally avoid chemical poisons, they focus on three core pillars: prevention, natural deterrents, and mechanical traps.
Potential problems with spray foam insulation
reduce air circulation and ventilation within a roof space. lead to dampness and condensation on the underside of a roof because it forms an air barrier and stops moisture from escaping. place timber-framed roofs at risk of decay.
Closed-cell spray foam and rigid foam board are hard, unattractive to rodents, and double as air barriers. Mineral wool is dense enough to discourage nesting. Fiberglass batts, especially in crawl spaces and attics, are essentially an open invitation.