The R-value of attic insulation is a measure of its ability to divert heat. Blown fiberglass insulation is the most common option for existing homes, as it is cost-effective and easy to apply. ENERGYSTAR recommends an R-38 value for most homes, which translates to approximately 12 inches of insulation. If it has been ten years or more since the last insulation was installed, or if there are signs of mice in the attic or walls, it is best to consult a professional air conditioning technician.
They can assess the current insulation levels and inform you of any tax incentives or reimbursement offers available from governments and states to help cover part of the cost of improving your insulation. The choice of insulation depends on the space available, the apparent density of the materials (weight by volume) so that the ceilings do not sink with the additional weight, ease of access to the space, budget, how easy it would be to replace the insulation if there were a leak in the ceiling or wall, and whether you are building a new house or improving an existing one. The effectiveness of an insulated wall or ceiling also depends on how and where the insulation is installed. Homes powered by oil or natural gas only need an R value of 38 in the attic, while those using an electric furnace will need an R value of 38 to 49 in their attics. A good thermal barrier along the building envelope, such as insulation with a high R-value in walls, attic and raised floors, as well as multi-paned glass, helps reduce conduction. In colder climates, this means that warmer air from the house and attic will drain to all areas with weak insulation or gaps. Blown insulation can be made from polystyrene, fiberglass and wool, and they all work effectively but have different lifespans.
Each state has its own minimum insulation requirements, which are often lower than those recommended by the Department of Energy. Energy Star's recommended insulation map for homes shows that most of Florida is within Zone 2.The only way to avoid this heat loss or increase is to ensure that the insulation meets the current R-value guidelines for Miami Beach, which is part of Climate Zone 1 (Broward, Collier, Hendry, Lee, Miami-Dade, Monroe and Palm Beach counties). The lack of a complete air barrier in the same place as the insulating barrier causes convective heat loss and gain. Energy Monster recommends spray foam insulation for Florida residents due to its high R-value, its ability to create an airtight seal and its moisture resistance. However, it is best to consult experts to determine which type of insulation is best for your home.
When you know that some insulators resist heat flow better than others, it can be tempting to buy the one with the highest R-value and call it a day. You can measure the thickness of your attic insulation with a ruler and multiply this number by its R-value to get an insulation rating.
