As the years go by, insulation can become worn out and less effective. Factors such as age, extreme weather conditions, and pests can all contribute to the deterioration of the material. If you don't replace your home's insulation, you may need to use more energy to heat or cool it. Generally speaking, replacing old insulation may not be worth it if the old insulation is still dry, dust-free, and not crushed.
In this case, there is no need to remove it. In fact, leaving the old insulation in place can be very advantageous. This way, you will continue to benefit from the existing insulation while also having an extra layer of protection on top. If the old insulation has a joist depth, try to place a new insulation crosswise. Spray foam is a great option for long-term insulation as it can last up to 80 years without needing any updates. Replacing old insulation can be a great way to save energy and money in the long run.
However, it is important to assess the condition of your existing insulation before making any decisions. If your insulation is still in good condition, there is no need to replace it. However, if it is damaged or worn out, replacing it with a new material may be worth it in the long run.
