Selecting the right insulation requires evaluating your climate zone, the targeted R π -value, and the specific application (e.g., walls, attics, pipes) to prevent moisture buildup, manage costs, and ensure fire safety.
The type of insulation you should choose depends on how you will use it and on your budget. While closed-cell foam has a greater R-value and provides stronger resistance against moisture and air leakage, the material is also much denser and is more expensive.
Yes, R-38 is technically better than R-30 because a higher R-value means greater resistance to heat flow. However, the "better" choice depends on your climate, space constraints, and local building codes, as R-38 requires more thickness and cost.
The higher the R-value, the greater the performance of the insulation.
Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces. Use the JM insulation calculator to determine the recommended R-value for your project, as well as how much insulation you'll need.
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.
R-30 insulation typically requires a thickness of 8.5 to 10 inches, depending on the type of material you use. Because the thickness needed to achieve this thermal resistance varies by material, checking the exact product specs before buying is highly recommended.
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.
It's recommended to leave an air gap insulation of at least 25mm or 1 inch for the walls and ceilings. This should be enough to allow for ventilation and prevent moisture buildup. The same rule may be applied when using foil insulation. On roofs, the air gap should be larger, typically around 50mm or 2 inches.
Yes, you can use R-30 insulation in walls, but only if your wall framing is thick enough to accommodate its thickness. Because R-30 insulation is typically 8.58.58.5 to 101010 inches thick, it will not fit in standard 2Γ4 or 2Γ6 walls without crushing it. Compressing insulation destroys the trapped air pockets that give it its R-value, drastically reducing its effectiveness.
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.
R-Values for Insulation
In order to qualify for certain tax credits, homes and businesses need to meet minimum levels of insulation. For most homeowners, this means adding insulation with R-values between R-19 and R-30.
Closed cell spray foam is rigid once set. It is a better thermal insulator and was previously sold to stabilise failing roofs. But if it has been used inappropriately or installed poorly, it might put stress on timbers, restrict air circulation and put them at risk of decaying.
It is a common measure adopted by manufacturers, retailers, and even some contractors to ascertain the performance of insulation. Although R-value is important, it will not help you save on your power bills. The fact is, the energy efficiency of your home does not just rely on a number.
There are several different types of insulation, including the four most common listed below: Loose-Fill & Blown-In Insulation. Batt & Roll Insulation. Reflective Insulation & Radiant Barriers.
What time of year is Insulation cheapest?
The Environmental Protection Agency banned spray-on asbestos insulation in 1973, certain types of pipe and block insulation in 1975 and new asbestos insulation products in 1989. In 2024, the EPA banned most uses of chrysotile asbestos products, including imports.
Mice are curious and always searching for safe, snug, and warm nesting sites. Attics filled with blown-in insulation provide an excellent optionβfrom 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.
The R-value of a 2-inch thick rigid foam board depends on the material type, ranging from R-7.5 to R-13. Because rigid board R-values are cumulative, they provide exceptional continuous insulation for walls, roofs, and basements.
R-values rate how well building insulation can prevent the flow of heat into and out of the home. Higher ratings mean greater insulation performance and thus more savings on your next heating and cooling bill.
To achieve an R-30 value, blown-in insulation typically needs to be 9 to 10.5 inches thick. The exact depth depends on the material used, as blown-in fiberglass typically settles at 10 to 10.5 inches, while blown-in cellulose requires about 9 inches.
Choosing the best time to insulate your home largely depends on your circumstances and needs. However, it's generally recommended to install insulation during the spring or early summer months. This timing allows you to prepare your home for the extreme temperature swings of summer and winter.
Blown-In Insulation: Costs about $1.00 to $2.80 per square foot, making it slightly more expensive than rolled insulation. However, blown-in insulation is better suited for filling irregular or hard-to-reach spaces, such as existing walls or tight attic corners.
Cost and Considerations
Attic insulation installation ranges from $1.50 sq/ft. to $2.45 sq/ft. The average cost of attic insulation installation is $1.80 sq/ft.