Floor insulation


Floor insulation is a simple and effective way to keep your home warm and reduce your energy bills.
Regardless of your floorboards adding ground floor insulation to a well-insulated walls and roof could save you up to 15% of heat is lost through a house per year.
Floor insulation is most commonly done when putting a new floor in place and this will make a large saving to your overall heating bill.
Insulating a floor involves adding an insulating material beneath the floorboards, thereby reducing heat escaping through the floor into the ground.
Insulation also acts to prevent draughts coming up through the floorboards.
You don't need to insulate the floors of upstairs rooms in your house if they're above heated spaces. But you should think about insulating any floors that are above unheated spaces as you could be losing a lot of heat through those.
Ground bearing floors can include insulation either below or above the floor structure; the choice will have an impact on the temperatures inside the building.
Where a quick heating response time is required, for example when we want warm up a room more quickly when the heating is switched on, insulation above the floor structure should be considered.
Where heating is used over more prolonged periods, insulation is installed below the floor structure; the thermal capacity of the building is increased, helping to maintain steady internal temperatures.
Older homes are more likely to have suspended timber floors, where the floorboards sit upon wooden joists. Timber floors can be insulated by lifting the floorboards and laying mineral wool or rolls of mineral fibre like that used to insulate lofts can be fitted between the flooring joists. Insulation in a suspended timber floor application will provide long term energy savings for buildings.
Many homes are built with solid a ground floor made of solid concrete. This can be insulated when it needs to be replaced, or can have rigid insulation laid on top.
Insulating concrete floors be done with sheets of polystyrene insulating boards. Polystyrene is easy to cut and drill holes in, but has high compression resistance; it also has excellent insulating properties. Before installing polystyrene insulating boards you should first lay a damp proof membrane over the entirety of the solid floor.
The damp proof membrane can be placed above or below the concrete slab. If the membrane is placed above the slab an additional membrane may be required to protect the insulation from ground contaminants.
Under floor heating systems are becoming an increasingly popular consideration in housing designs, providing home owners with heating efficiency and home comfort. Correct insulation forms an essential part of any well-designed under floor heating system.