As an expert in the field of insulation, I am often asked whether it is necessary to remove old insulation and replace it with new. The answer is not always a simple yes or no, as it depends on the condition of the existing insulation and the type of insulation being used. In this article, I will discuss the benefits of keeping old insulation and when it may be necessary to replace it.If the old insulation is damaged, ineffective, and causing issues in your home, then it should be removed completely and replaced with new insulation. However, if the old insulation is still in good condition, there are benefits to leaving it in place and adding a new layer on top. The method of application for new insulation will vary depending on the type of insulation already installed.
If the old insulation is dry, dust-free, and not crushed, then there is no need to remove it. In fact, leaving it in place can provide additional benefits while also adding an extra layer of insulation on top. If you do decide to add new insulation on top of the old, it is important to place it crosswise if the old insulation is as deep as the rafters. This will ensure that the new layer is evenly distributed and provides maximum effectiveness. One common concern when adding new insulation over old is moisture. However, unless the old attic insulation is wet, there should be no issues with installing new insulation on top.
Any moisture that may be present will be trapped between the old and new layers, preventing it from causing damage to your attic floor and beams.
