Underfloor Insulation

Overview

• Rigid board insulation is made from materials such as expanded polystyrene (EPS), extruded polystyrene (XPS), or polyisocyanurate (PIR). It is available in pre-cut boards that are installed beneath the floor. U-value: Typically ranging from 0.20 to 0.30 W/m²K, depending on the thickness and type of rigid board insulation used.

• Insulated Concrete Formwork (ICF) systems involve using insulating foam panels to create a continuous insulation layer around the concrete floor structure. These systems offer both insulation and structural support. U-value: Typically ranging from 0.15 to 0.25 W/m²K, depending on the thickness and composition of the ICF system. 

• Spray foam insulation is applied directly to the underside of the floor, creating a seamless insulation layer that conforms to the shape of the floor and fills any gaps or voids. It is commonly used in retrofit applications. U-value: Typically ranging from 0.15 to 0.25 W/m²K, depending on the thickness and type of spray foam insulation used.

• Suspended timber floor insulation involves insulating the void between the floorboards and the ground or subfloor. Insulation materials such as mineral wool or rigid insulation boards are laid between the timber joists. U-value: Typically ranging from 0.20 to 0.35 W/m²K, depending on the thickness and type of insulation used. 

• Insulated cavity tray systems are used in cavity wall construction to prevent heat loss through the cavity beneath the ground floor. These trays incorporate insulation material and are installed horizontally within the cavity. U-value: Typically ranging from 0.15 to 0.25 W/m²K, depending on the thickness and composition of the insulated cavity tray system. It's important to note that the specific U-values may vary based on insulation thickness, materials used, and the overall design of the building. These values provide a general range and should be verified with the insulation manufacturer or calculated based on the specific installation details.