Finding hidden energy savings in your attic
October 2024
Using your attic for storage can be problematic when maximizing your home’s energy efficiency.
by Miranda Boutelle, Contributing Columnist
Q: Do you have any tips on finding hidden energy savings in my home?
A: I’ve been in a lot of homes. One common hiding spot for energy savings is the attic. It is also a common location for storing holiday decorations and sentimental items that are infrequently used.
Yes, using your attic for storage can be problematic when maximizing your home’s energy efficiency. Let’s explore how to improve insulation levels and properly store items in your attic.
Attic insulation is one of the best low-cost ways to make your home efficient. People often associate insulation with keeping your home warmer in the winter, but it also provides benefits in the summer. Insulation reduces heat transfer from the attic to the house, which lowers energy bills for air conditioning and makes your home more comfortable.
Attic insulation is measured in R-value, which is a measurement of how well a material resists the flow of heat. For attic insulation, thicker is better. The recommended R-value is typically between R-38 and R-60, depending on your climate. Hawaii and the southernmost tips of Florida and Texas recommend R-30. Measured in inches, that ranges from around 10 to 20 inches, depending on the type of insulation you have. In most homes, the ceiling joists are buried in insulation to achieve the recommended R-value.
The problem with attic storage is it typically doesn’t offer enough space for the recommended R-value. Often, plywood or boards are placed directly on top of the ceiling joists, which isn’t enough space for the insulation. Insulation can get compacted by people moving items in or out, reducing the effective R-value.
Ideally, the attic would not be used for storage so it could instead be properly insulated, but that’s not feasible for everyone. Here are some strategies for maintaining attic storage and recommended insulation levels.
The best location for attic storage is over an unconditioned area of your home, such as the garage. You don’t need insulation in attic spaces over a garage or unconditioned area because you are not heating or cooling the space below. This makes it the perfect spot to tuck away items for storage.
If that isn’t an option, consider minimizing the number of stored items or the storage area’s footprint. A great way to do this is by building an attic storage platform. A raised platform allows the space underneath it to be fully insulated. These platforms are available in ready-to-install kits, or you can buy materials and build them yourself.
Allow enough space underneath the platform to achieve the proper R-value. Use lumber to build a frame perpendicular to the existing joists and cover it with plywood or oriented strand board. Once your storage area is set up, add insulation inside the platform to bring the R-value up to the proper level.
Your attic might also have trusses that allow you to build shelves and maximize space by storing items vertically.
Always wear a dust mask or respirator when working in the attic. Remember to weatherstrip the attic hatch to ensure a tight seal. Look around your attic to see if you can find any hidden opportunities for energy savings.
Miranda Boutelle writes on energy-efficiency topics for the National Rural Electric Cooperative Association.
Building an attic storage platform offers extra storage space and helps maintain the energy efficiency of the attic with insulation underneath it.