Insulating floor is insulating floor enough during a new build, but for homeowners looking to make their old homes more energy efficient it’s often a project that falls down the priority list. That’s because, compared to attic insulation, the work is labor-intensive and potentially dangerous and, depending on your skills, it can be quite complex.
The most common way to insulate a floor is to push quilt-type or other flexible types of insulation—like wool—into the spaces between joists from below. If this isn’t an option, it may be necessary to pull up the floorboards. If that’s the case, it’s best to number the boards so they can be put back in the right place. And of course, it’s a good idea to ensure that the floorboards are dry, free of damage and dampness, and that no ventilation openings are blocked by the new insulation.
Insulating Floor: Why It’s Important and How to Do It Right
A more advanced solution is to install a continuous layer of rigid foam insulation on the underside of the floor joists. This reduces thermal bridging, makes the room more comfortable and cuts the amount of energy it takes to keep a space warm or cool.
Alternatively, a floor insulated with a special screed can be a quick and easy option that doesn’t require the removal of the existing floorboards. Usually consisting of cement with polystyrene granules, the material is available from some builders and it’s also possible to buy ready-made versions from specialist suppliers. This type of insulation has a slightly higher cost than other options.