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Insulation Material Which Resist Heat Flow

Insulation of the building envelope helps keep heat in during the winter and out during summer to improve comfort and save energy. A well-insulated and well-designed home or building will provide year-round comfort, cutting cooling and heating costs and reducing greenhouse emissions. Resistance to heat flow is achieved by the use of either bulk insulation or reflective insulation, which work in different ways.


Direction of Heat Flow


Most significant heat flow at a given time. Heat flows from hot to cold environments and this is considered to be the direction of natural heat flow. Thus “upwards” implies heat flow from a conditioned space through the ceiling or roof and “downwards” implies the opposite. Likewise, horizontal flows can be described as inwards and outwards.

Insulation Benefits


It helps maintain a comfortable indoor temperature and in doing so, helps save electricity as heating and cooling needs are reduced.

Thermal Insulation maintains a comfortable indoor climate all year round; keeping interiors warm in winter and cool in summer

Performance (R-Values)



The R-Value is the measure of an insulation product’s ability to restrict heat transfer. The R-Value is therefore indicative of an insulation product’s thermal insulation performance. The higher the R-Value the better the performance and effectiveness of the insulation product. The R-Value of ISOTHERM is dependent on the thickness selected.

Total R-Values

This is the total thermal resistance provided by a roof or ceiling assembly and /or wall, including the insulation material. Total R-Values are the best indicators of performance.

UP R-Values

This is the resistance to the upward flow of heat; sometimes referred to as “winter” R-Values or warming.

Down R-Values

This is the resistance to the downward flow of heat; sometimes referred to as “summer” R-Values or cooling.

Added R-Values

The added R-Value is the value of the insulating material added to achieve a certain value required.


Since opening our doors in 1981, Insulation And Packaging Distributors cc has been supplying roofing insulation material to hardware stores, building contractors, architects, quantity surveyors, developers, as well as any other individuals renovating or upgrading their homes.

As a family run business for the last 38 years, no project is too big or too small. With our experience and expertise in the insulation industry, we will make sure that you are getting the best product for your specific project, all with competitive prices and outstanding service.

There are several types of insulation to choose from, and thus you should always compare the different products to find the one that is best suited for your particular building.

Whether it be Reflective foil insulation, Bulk insulation or Composite bulk insulation we will assist you with technical information, installation instructions and any other information you might require to make sure that you are improving the thermal comfort of your building, and that all your requirements are met in a cost-effective way.

Insulation And Packaging Distributors cc is also the main distributor of Sisalation in Gauteng, supplying all grades of Sisalation insulation materials.

As an additional service we also supply a range of packaging materials such as paper bags, tapes, wires, twines and bituminized kraft papers.