A house can definitely be underinsulated (millions of homes in the United States and Canada have this same problem), but can a house have too much insulation? In short, yes, it can. At that time, it would be better to forgo certification and reduce insulation levels, since manufacturing that amount of insulation generates more emissions than would be saved over the life of a home. When reviewing an isolated loft-style space, things to consider include the presence of moisture or any disintegration of insulation or roof materials. In terms of insulation, the situation is similar to the following: if you live in a cold climate and you currently have a 2 x 4 wall insulated with fiberglass blocks and you plan to add two inches of insulation with rigid panels, the return on investment could be 5 years, if you choose a random number.
The truth is that Building Code insulation levels were not decided by great minds who reflected on the “ideal” amount of insulation. To avoid incorrectly measuring the amount of insulation in my attic, it's best to leave the inspection and energy audit in the hands of certified attic specialists. Home Logic and LogicFoam are aware of problems related to the sale or refinancing of properties after the installation of aerosol foam insulation. Having a single product that insulates the attic will also facilitate repair and maintenance tasks in the future.
It would have been better from an economic and ecological point of view if they had only installed 8 inches of insulation on the subfloor, regardless of their windows. Of course, that assumes that all other conditions are the same, which means you're not doing anything stupid with the insulation, such as blocking the ceiling vents or stacking the insulation up to the roof cover. An energy auditor can confirm if you have too much insulation in your home or if it's simply a poorly insulated attic. Considering that much of the goal of having insulation is to save money, investing in additional insulation when it's not needed is counterproductive.
The reason I mention the decline in yields is that if you have an attic with an insulation value of R-38, it will surely not be worth raising it to R-60 unless you are already doing insulation work. If insulation is added to an attic before eliminating attic detours, this could make the attic space much colder than ever.
