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Slab insulation
Slab insulation, also known as underslab insulation. Usually composed of a foam type product, it is placed between the ground sand and slab top. Creating a thermal barrier between the earth and slab giving a high R value, same principle applies to walls and ceilings. Walls and ceilings are insulated, so why not the slab?
R Value Of Concrete Slab
The R value measures how well a building material (e.g. a concrete slab) resists the conductive flow of heat. The R value for an uninsulated concrete slab is approximately 0.1 per 150mm. A higher R value means that the material has better insulation properties. Depending on supplier and product, 30-40mm of slab insulation will add R1 to the concrete slab. insulation can go up to R2.5 or greater. This is more efficient than waffle pod, which is about R0.6-0.7.
What is concrete slab foam insulation?
Concrete slab foam insulation is manufactured from expanded or extruded polystyrene. Expanded or extruded polystyrene acts as an insulant because it prevents heat loss and transfers given the densely formed polymers. Given its dense construction, it is also an effective moisture barrier to prevent mould developing inside the property and noise barrier to muffle external sounds. This product is developed in sheets and it is a lightweight, durable and reliable product to support a heavy concrete base.
Why use concrete slab foam insulation?
The purpose of concrete slab foam insulation is to improve the thermal efficiency of the building because heat loss and temperature variations are mainly caused through the floor of the property. The foam sheets are laid over the existing surface to prevent the earth underneath the concrete slab contributing to temperature variations inside the property. Unlike its fluffier and flexible counterparts, foam insulation is rigid and needs to be installed correctly so that no gaps exist.
Benefits of foam insulation under concrete slab
A well-insulated concrete slab ensures that the thermal efficiency of the property is controlled and maintained. Foam insulation under concrete slab avoids thermal discrepancies caused by uncontrollable temperature variations, heat transfers and losses and variable environmental conditions. This will help to reduce energy costs. In addition, foam serves as a moisture barrier, humidity controller, noise barrier and strong support for heavy loads.