When it comes to installing attic insulation in a humid climate, there are some special considerations to keep in mind. To ensure that your insulation is effective and efficient, you'll need to know where to install it, what R-value you want it to achieve, and what type of insulation is best for your home. To begin with, it is important to use blocks without cladding or with blown insulation in the attic so that they can dry to the attic side. Additionally, a good primer and paint layer should be used as a vapor barrier.
In very hot and humid climates, if a vapor retarder is used, the National Association of Insulation Manufacturers (NAIMA) recommends installing it on the outside of the wall. One of the most important steps is to move the attic insulation so that the air conditioning ducts are inside the insulating wrapper. This will help reduce energy loss before the air reaches your rooms. The effectiveness of an insulating material's resistance to heat flow also depends on how and where the insulation is installed.
When selecting insulation for your home, you'll need to consider the climate, type of heating and cooling system, and part of the house you plan to insulate. Generally, you should have at least 20 cm of insulation in the attic for optimal cushioning against temperature changes. Additionally, using a layer of rigid insulation to cover the entire house will create a continuous layer of insulation. In ventilated attics, relative humidity decreases as the attic air heats up; however, the opposite was observed in sealed attics.
Field studies were conducted in a hot and humid climate to investigate the thermal and hygrothermal performance of ventilated attics and semi-conditioned unventilated attics sealed with open-cell and closed-cell aerosol polyurethane foam insulation. Installing insulation reduces heat transfer, so it also moderates the effect of temperatures throughout the house. Depending on the building code and local climate zone, you may also need to install a vapor retarder along with the insulation. By taking these special considerations into account when installing attic insulation in a humid climate, you can ensure that your home is properly insulated and energy efficient.
