Under Slab Insulation Requirements 2021

Insulation is an important building material that regulates internal temperature and improves the thermal efficiency of the property. Insulation helps to keep the property cool during the summer and warm during the winter. To take advantage of comfortable living conditions, insulate the property to improve energy efficiency and take control of indoor temperature. Insulation can be found in the ceiling, walls, underfloor, on the edge of the concrete slab and under concrete slab.

The type of insulation for a property is influenced by many factors including the type of property, building materials used, surrounding environment and average climate conditions. Your builder and engineer will help you assess the optimal building materials to be used at the property to enhance the building’s resistance to heat transfers. This will include the recommended type of insulation to achieve a high energy efficiency rating.

Insulation products have a corresponding R value that measures the material’s resistance to conduct or transfer heat. The higher the R value, the greater thermal efficiency rating for that building material. Insulation is available in many types with differing R values depending on the requirements of the property and the owner.

Under slab insulation improves the thermal efficiency of the property by adding thermal resistance to the underside of the concrete slab on which the property is built. The slab is made from concrete which is poured on prepared and compacted earth and then reinforced for durability and longevity. Heat can be transferred to the earth, which limits temperature control inside the property. This loss of heat will lower the energy efficiency of the property and lead to higher energy costs to regulate the internal temperature.

Here is a list of important under slab insulation requirements.

  1. Standards for insulation products

All insulation materials that are sold in Australia must meet Australian Standard AS/NZS 4859, materials for the thermal insulation of buildings, even if they are imported. Ensure that the insulation product you install has been manufactured in accordance with this standard. Consult with the retailer or manufacturer and check that your builder is acquiring reputable products.

  1. Follow manufacturer instructions

When installing insulation products, follow manufacturer instructions. All instructions must be considered in accordance with building codes, guidelines and regulations. Make sure that your builder is aware of the applicable building practices so that the product is installed correctly and that the warranty is not affected.

  1. Choose appropriate R value

The thickness of the under slab insulation sheet will determine the R value. The thicker the sheet, the higher the R value. This means that the sheet will resist a greater amount of heat transfer. This keeps heat inside the property and prevents uncontrollable temperature variations inside the property.

  1. Consider building design

The effectiveness of under slab insulation is also impacted by the design of the building. If there are other defects in building design, the thermal efficiency gains from under slab insulation will be compromised. This will expose the property to temperature variations that need to be controlled with building design improvements or the use of air-conditioners and heaters at a cost.

At Foilboard, we develop leading insulation materials for Australian commercial and residential properties. Our under slab insulation product, Slabmate, is the new under slab insulation solution for slab-on-ground construction. Slabmate has been designed to create a thermal barrier adding to the total insulation of the project. For further information, contact us on 1800 354 717.