A Quick Guide to Insulating Cavity Walls

A Quick Guide to Insulating Cavity Walls

Cavity wall insulation should always be carried out by professionally trained and qualified installers that guarantee the results. Here is a quick guide to the process that requires filling the empty cavity between two walls with your chosen insulating material.

Walls Inspection

Before the insulation work begins, the insulating professional will check if the cavity wall is empty or has been insulated before. The building walls need to be inspected to make sure they are in good condition and suitable for cavity insulation if this is the case. Alternatively, the local building department may have records on the insulating condition of the walls.

The qualified personnel will perform a boroscope inspection by drilling a series of small holes in the wall. Generally, they will blow or fill the insulation into the cavity wall using special equipment. The inspection will reveal if the walls are free from damps, moisture, cracks, and other such poor conditions that will not permit the cavity insulation filling.

Expanded Polystyrene (EPS) manufactured by the Isowall Group is fast becoming recognized as the insulation material of choice by specifiers of “Bills of Quantities”. This comes largely as a result of our technical knowledge backed up by years of experience in the building and construction industry.

Insulating Materials

There are a variety of material fillers on the market used for cavity wall insulation. The choice of insulating material can have a significant impact on the process, minimising the drilling needed to fill the entire wall cavity.

Popular choices include mineral or rock wool, cellulose or foam, and expanded polystyrene (EPS) sheets or boards, which are EPS beads or granules bundled together under pressure. EPS is becoming the preferred choice for insulating cavity walls because it is more effective in thermal insulation to keep heat in, and it doesn’t absorb any moisture and water.

There is also the fact that EPS is relatively cleaner and easier to install than alternative methods. Beads can be quickly blown to reach most of the inaccessible places for gap-free insulation, while sheets or boards can be inserted to the exact specifications of the cavity. The insulating material should be confined to and not exceed the cavity wall space, and EPS sheets are ideal to fit specific measurements!

In short, the cavity wall insulation with EPS Sheets is more versatile than other applications. EPS is energy-efficient and resistant to moisture and chemicals, while mineral wool, for example, needs to be kept dry to maintain its insulating properties.

Cavity wall insulation is quick and easy if done according to professional standards. Qualified installers distribute the material evenly to avoid creating internal air pockets, which could lead to condensation and mould, or place insulating sheets carefully in the cavity.

The Isowall Group has been manufacturing and distributing Isolite Block Moulded EPS since 1985, and Isolite Shape Moulded EPS since 1992. Isolite EPS products are used primarily for insulation, lightweight fillers and semi-rigid cushioning. 

Isowall is the supplier of choice within Africa for Insulated Sandwich Panel, EPS and EPP products. Contact us for more information.


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