Yes, you can insulate between roof rafters, but the method depends on whether you have a vented "cold roof" (where the attic space is unheated and vented) or an unvented "warm roof" (where the attic is sealed and heated). Improperly insulating rafters can trap moisture, leading to mold and roof rot.
Yes, but only if you are converting your attic into a conditioned, livable space. If your attic is purely for storage, you should never insulate the roof rafters. Instead, insulate the attic floor joists to keep your home’s main living space, and let the attic itself remain ventilated.
To insulate between roof rafters, install baffles to preserve a ventilation channel, cut rigid foam (PIR) boards or fiberglass batts to fit snugly between the rafters, and cover the installation with a continuous vapor retarder. This process creates a "cold roof" (if ventilated) or "warm roof" (if unventilated).
Rigid polyisocyanurate (PIR) foam insulation boards (such as Celotex XR4000 and GA4000) are among the most thermally efficient commonly available insulation materials on the market.
The most commonly used fibreglass insulation in the UK for insulating between rafters comes in rolls with a width of 400mm or 600mm and thickness ranging from 100mm to 200mm. These dimensions are designed to fit between the standard rafter spacings of 400mm or 600mm.
Yes. For standard vented attics and cathedral ceilings, you must maintain an air gap of 1 to 2 inches between the top of the insulation and the underside of the roof sheathing. This void is vital for continuous airflow to prevent moisture buildup, mold, and rot.
Installing too much insulation can lead to poor ventilation, condensation problems, potential structural damage, overheating, and increased costs.
What time of year is Insulation cheapest?
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.
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.
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.
While you can physically touch fiberglass insulation with bare hands, you should never do it intentionally. Fiberglass is made of spun glass fibers that break off easily. Touching them causes microscopic glass shards to embed themselves in your skin, leading to severe, irritating itching, and sometimes a rash.
In contrast a 'warm roof space' or 'warm roof' has insulation between or just under or over the sloping rafters, so that the whole of the volume under the roof can be heated and used. Some buildings have combinations of these two arrangements.
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.
Yes, you can insulate between roof rafters, but the method depends on whether you have a vented "cold roof" (where the attic space is unheated and vented) or an unvented "warm roof" (where the attic is sealed and heated). Improperly insulating rafters can trap moisture, leading to mold and roof rot.
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.
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.
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.
Rats are a primary food source for a wide variety of animals. Their most significant natural and artificial predators include:
There is no single "chew-proof" insulation that will unilaterally stop a highly motivated rodent, but combining borate-treated dense-pack cellulose or mineral wool with physical exclusion materials creates an impassable barrier. Traditional fiberglass is highly susceptible to nesting.
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.
The largest source of heat loss in a typical house is uncontrolled air leakage (drafts), accounting for up to 38% of lost heat. Warm air escapes through hidden cracks and gaps, while the following structural areas are the primary culprits for escaping warmth:
Home insulation doesn't have an “expiration date,” and the material doesn't “go bad” after a certain number of years have passed. Ultimately, the condition of the insulation and its performance are more important factors than age when deciding whether to upgrade or replace insulation.