In most cases, you do not need to remove old roof insulation before adding new material; simply adding a fresh layer perpendicularly on top is the most cost-effective way to boost energy efficiency. However, removal is necessary if the old insulation is wet, moldy, fire-damaged, infested by pests, or contains hazardous materials like vermiculite.
You do not always need to remove old insulation. If it is dry, undamaged, and free of pests, it is often perfectly fine (and more budget-friendly) to simply add a new layer on top to boost your home’s energy efficiency.
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.
Insulation should be changed or added every 15 to 20 years. But depending on the type of insulation installed, its rating, how much it has compressed and moved over time, and whether any damage has been done, it may need to be replaced or retrofitted sooner.
Roof insulation typically lasts 20 to 30 years, though some materials can last up to 80+ years if kept dry and undisturbed. However, factors like water damage, pests, and settling often necessitate replacement.
During roof replacement, roofing contractors usually strip the roofing down to the decking material and if the roof deck is in good condition, it's kept as it is. Since the roof insulation is typically installed on the underside of the roof decking, you have the opportunity to have your roof insulation replaced.
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.
Installing new insulation over old is a viable option for keeping your home warm in the winter and cool in the summer. However, the current insulation must be in good condition. It's vital that a professional insulation technician inspect your current insulation before adding another layer.
Should I do the project myself or hire a contractor? If your attic is accessible and not too difficult to move around in, and you enjoy tackling bigger home improvement projects, attic insulating may be a good DIY project. Otherwise, consider finding a contractor to complete the project for you.
A: Fiberglass insulation is pink or yellow, springy, and has a cotton-candy-like texture. Asbestos loose-fill is denser, grayer, and more mineral in appearance with no springiness. Visual inspection is not reliable — only laboratory testing confirms asbestos content.
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.
The cost to insulate a new build with spray foam typically ranges from $14,100 to $30,500 for an average 2,000 to 2,500 sq. ft.
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.
We use a product called DSV for this important step. DSV is a Disinfectant, Sanitizer, and Virucide. When sprayed or fogged in your attic, it kills the odors left behind from the urine, feces, and afterbirth of rats, mice, squirrels, and bats.
By using the latest building standards, insulating techniques and airtight, multi-pane windows — new homes can be built to resist this. In older houses, inefficient air loss is caused by gaps that gradually develop in the building's foundation, walls, ceiling and attic.
For a 1,500-square-foot attic, expect to spend around $1,500 to add cellulose insulation professionally. DIY fiberglass installation may cost $500–$750 in materials. Get multiple quotes when hiring an insulation company.
Tipping an HVAC installer is not customary, and most installers will not expect anything from you after they have completed their work.
Unfaced insulation is great for new construction, remodels, walls, floors, ceilings, basements, attics and crawlspaces. It's best used for interior wall applications that do not face the outside and also in rooms that don't need moisture control, like living rooms, dining rooms and studies.
Cellulose Insulation
The typical lifespan is 20 to 30 years, with degradation beginning as early as 15 years after installation. As with other types of insulation, severe weather or outside interference can reduce the lifespan.
Much of the vermiculite installed before 1990 may be contaminated with asbestos, a dangerous mineral that can cause long-term health issues if the fibers become airborne. If you suspect your attic insulation might be vermiculite, do not touch or disturb it.
The 7 and 7 rule for attic conversions refers to the common requirement that finished attics be at least 7 feet wide and 70 square feet, with 7-foot ceilings over at least half. Keep in mind that this is a general guideline. Local building codes may have stricter requirements that supersede this rule.
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.
The ultimate "number one" mice killer depends on your specific needs—whether you prefer fast-acting poison or a safe, pet-friendly option.
While traditional fiberglass and cellulose are soft and easy for mice to tunnel through, true "rodent-proof insulation" relies on dense, unpalatable materials like mineral wool, combined with solid physical barriers to block entry points.