To increase the R-value of your insulation, you can install additional layers of insulation over the existing material or switch to a material with a higher R-value per inch (like spray foam or rigid foam boards). The R-value rating is cumulative, meaning adding new layers directly increases your total thermal resistance.
Installing more insulation in your home increases the R-value and the resistance to heat flow. In general, increased insulation thickness will proportionally increase the R-value.
Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. 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.
Yes, R-30 is a great insulation level for attics. It blocks about 97% of heat transfer and is highly recommended if you live in a warm, southern climate. However, if you live in a cold northern climate, modern standards often require higher values (like R-38 or R-49).
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.
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.
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.
To determine the ideal insulation thickness, you need to identify your climate zone and the recommended R-value. According to Energy Star, given that the material has an R-value of at least R3 per inch, a roof in a warmer climate zone must be between 13 and 14 inches.
And we have a third layer of a drywall and this drywall has an R-value of 0.45, half inch drywall.
What time of year is Insulation cheapest?
For most attics, blown insulation is better than rolled insulation. Blown-in is ideal for older homes or attics with irregular framing, as the machine-blown material conforms tightly around pipes, wires, and joists. Rolled insulation is better for brand-new, empty attics with no obstructions.
Yes, insulation is tax-deductible in the form of a federal tax credit, specifically the Energy Efficient Home Improvement Credit (Section 25C). You can claim 30% of the cost of insulation and air sealing materials, up to a maximum annual credit of $𝟏,𝟐𝟎𝟎.
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.
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.
Yes, you can double insulation layers to effectively increase your total R-value. Stacking or layering insulation adds thermal resistance, but to get the full benefits without losing performance, you must use the right materials and avoid compressing the insulation.
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.
Drywall and plywood both provide minimal thermal insulation on their own. Plywood offers a slightly higher R-value than drywall of the same thickness, but neither material serves as a substitute for dedicated wall insulation like fiberglass or rigid foam.
Yes, you can physically compress R19 fiberglass batts into a 2x4 wall, but it is not recommended.
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.
Insulating a 2,000 sq. ft. attic costs between $2,000 and $9,000, with most homeowners paying around $3,600 to $5,800 for professional installation. The wide price range depends on the type of insulation, labor rates, and whether old insulation requires removal.
Thicker walls generally have a lower U-value, which means they offer better thermal efficiency. For example, a 600mm thick solid wall has a U-value of 1.6W/m2K, while a 300mm thick wall has a U-value of 2.78W/m2K. The goal of adding external insulation is to reduce the U-value, thereby improving thermal efficiency.
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.
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.
An R-60 blown-in insulation layer is typically 17 to 24 inches thick, depending on the material you choose. Because blown-in insulation settles over time, contractors usually blow it in slightly thicker to guarantee the final settled depth delivers the full R-60 rating.