Yes, you can absolutely use too much loft insulation. While adding thick layers slows heat loss, overloading an attic traps moisture and blocks essential airflow. This disrupts the vital balance between insulation and ventilation, leading to structural wood rot, mold growth, and damaged framing.
Current government recommendations are for loft insulation thickness to achieve a depth of 270mm. However, some new properties are increasing the thickness to 300mm. Again, as long as the loft is properly ventilated, this is acceptable. You may lose a little storage space, but you will save money!
Mold and Mildew Growth
Having too much insulation in your attic can allow for the accumulation of moisture. This leads to mold and mildew growth, which can be extremely bad for your health. Mold grows and spreads very quickly.
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.
Pink or yellow loft insulation materials are older insulation sheets that used to contain asbestos as a primary ingredient. As such, yellow loft insulation and similar materials posed serious health risks during and after installation such as asbestosis, lung cancer, and irritation.
Should I remove old loft insulation before laying new? Older insulation material will typically need to be removed before adding new insulation. However, in some cases the material may be in good condition, meaning you can simply top up the existing insulation material for a fraction of the cost of a full replacement.
Asbestos insulation often looks fluffy and loose, similar to candyfloss or cotton wool. It can appear white, grey, or blue-grey in colour, with a slightly shiny or fibrous texture.
Fall is an ideal time for insulation.
Adding insulation before winter can help reduce heating bills significantly. Spring is another excellent option for installation. It provides an opportunity to prepare your home for summer's heat. Insulating in spring can keep your home cooler and reduce air conditioning costs.
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.
Attic insulation 30 years old or more, should be replaced.
After 30 years, loose-fill and blanket type attic insulation products have dramatically settled and lost much of its effectiveness. Settling reduces the R-value, which means heat will flow more easily in and out of your house.
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.
Yes, your lungs can get rid of fiberglass, but how effectively they do it depends on the size of the fibers and where they end up in your respiratory tract.
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.
Looking across your attic, if the insulation is level with or below the attic floor joists, you probably need to add more insulation. If you cannot see any of the floor joists because the insulation is well above them, you probably have enough, and adding more insulation may not be cost-effective.
What time of year is Insulation cheapest?
Direct contact with fiberglass or breathing airborne dust containing fiberglass may irritate the skin, eyes, nose, and throat. The symptoms of irritation are often nonspecific, temporary, and may include itching, coughing, or wheezing.
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.
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 safest and healthiest insulation for an attic is cellulose or mineral wool (rockwool). Both are naturally fire-resistant, free of harmful off-gassing chemicals like formaldehyde, and highly effective at blocking noise and resisting mold.
Natural Attic Ventilation
Here's why: in the winter, allowing a natural flow of outdoor air to ventilate the attic helps keep it cold, which reduces the potential for ice damming (snow that melts off a roof from an attic that is too warm and then re-freezes at the gutters, causing an ice dam that can damage the roof).
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.
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.
Your lungs can naturally clear some inhaled asbestos fibers through coughing and a mucus-clearing process, but many fibers become permanently lodged deep inside lung tissue. There is no medical treatment or procedure to remove embedded fibers once they are inside.
The "pink fluffy stuff" in your attic is fiberglass insulation. It is made by melting a mixture of sand and recycled glass, then spinning it into tiny, lightweight fibers. The pink color is simply a trademark created by the major manufacturer Owens Corning in the 1950s as a marketing strategy.
Asbestos loft insulation can be identified, it has a fluffy almost candy like appearance which is usually either a white or blue/grey colour. However, in the vast majority of cases it is impossible to tell whether Asbestos is present or not in a material with just the naked eye.