The core difference is placement and intent: loft insulation is laid on the floor to keep the living spaces warm while leaving the loft unheated for storage. Room in roof insulation is installed along the sloping rafters to transform the attic into a heated, habitable room.
The main difference between loft insulation and roof insulation is where the insulation is installed. Loft insulation is placed at ceiling level to prevent heat loss from the living areas below, while roof insulation is installed along the roof structure to keep the loft space warm.
Room-in-roof insulation is a way to insulate the ceilings and walls of rooms directly under the roof. This insulation helps retain heat and prevent energy loss through the roof. Room-in-roof insulation can make your home more comfortable and reduce heating costs in rooms that tend to get colder.
Insulating between and over the joists will help keep your home warmer, but it also makes the loft space above much colder. That's not a problem, but it does mean that any pipes or water tanks in the loft are more at risk of freezing in winter.
Insulating your loft will keep your house warmer but make the roof space above colder. Without their own insulation, pipes and tanks could freeze and an uninsulated loft hatch could let cold draughts into your house. However, don't insulate underneath your water tank, because this can cause your water to freeze.
Yes, mice can chew through and tunnel in rockwool (mineral wool) insulation. While rockwool is denser, fireproof, and doesn't provide nutritional value, its loose fibers and coarse texture actually make it an attractive material for mice to gather and shape into nests.
No, you should not lay loft insulation on top of the boards. This can compress the insulation and reduce its effectiveness. It can also create a condensation risk, damaging the roof timbers. The correct way to insulate your loft is to lay the insulation between the joists.
The healthiest insulations for a house are natural, bio-based materials that offer excellent thermal performance without off-gassing toxic chemicals. The safest and most non-toxic options available are sheep's wool, hemp, cotton (denim), and cork.
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.
Loft insulation does not necessarily make a house warmer, but drastically reduces the loss of heat in a home. Having adequate loft insulation in place will make sure your heating system does not work overtime, as your home will be able to maintain its indoor temperature for much longer.
Yes, mice love blown-in insulation. Because it is soft, warm, and easy to burrow through, materials like loose-fill fiberglass provide an ideal environment for nesting and breeding.
Insulating a 2,000 sq. ft. attic costs between $2,000 and $9,000 on average, depending on the material and labor needed. Blown-in fiberglass or cellulose usually runs $2,000 to $4,000, while premium spray foam costs $8,000 to $18,000+.
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.
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.
In winter, lofts often become the coldest room in the house because heat can escape quickly through the roof if insulation is lacking. Without proper insulation, including additional measures like insulating the loft hatch, it can be hard to keep a converted loft warm in winter.
The "best" type of roof insulation depends on your roof's structure and your climate. Spray foam is ideal for sealing and insulating attic spaces, rigid foam is perfect for flat or low-slope roofs, and blown-in cellulose or fiberglass remains the most cost-effective choice for open, sloped attics.
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.
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.
You do not necessarily need to remove old attic insulation before adding new layers. If the existing material is in good condition, topping it up is the most cost-effective way to boost energy efficiency. However, starting fresh is better if the old insulation is contaminated, water-damaged, or heavily compressed.
There is no single "best" insulation for every situation; it depends entirely on your climate, budget, and whether you are building new or retrofitting. However, for overall performance, closed-cell spray foam is widely considered the premium standard.
Most standard bulk insulation and air sealing materials qualify for the Energy Efficient Home Improvement Credit (Section 25C). Eligible materials include batts, rolls, blown-in fibers, rigid boards, expanding spray foam, and pour-in-place insulation. Air sealing products like caulk, weather stripping, and house wrap also qualify.
People remove spray foam insulation primarily because poor installation or improper use traps moisture. This hidden condensation causes severe wood rot, mold growth, and pest infestations. Additionally, the inflexible barrier can strain roof timbers and prevent surveyors from assessing the home's structural condition, which often leads mortgage lenders to reject loans.
Insulating the underside of your roof is highly recommended if you are converting your attic into a living space or have HVAC equipment in the attic. However, for standard unused attics, it is much better and cheaper to insulate the attic floor instead.
Yes, you can lay standard insulation over modern electrical wires (like Romex) in your attic, but it must be done carefully to avoid fire hazards and comply with electrical codes.
A whopping 30% of heat loss from a house occurs via the roof. Loft boarding can reduce that number significantly, keeping your home warm throughout the year. Not only does this equate to a more comfortable home, but it also means you'll be saving money on your energy bill.