Insulation Value

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Insulation Value

This is a combination of insulation materials, construction details and installation care that ensure the highest thermal performance. Today we understand that insulating the space between glass fibre posts is not the same as insulating the entire wall. Wood creates thermal bridges and air infiltration in the wall, around windows and doors, and in connections between the wall, ceiling and floor.

Understand the Basics

The basic method of heat transfer, which is affected by insulation, takes place through heat conduction. However, insulation also reduces heat loss in all three heat transfer modes: conduction, convection and radiation. Insulation significantly slows down natural convection, making heat conduction the primary mode of heat transfer. Porous insulation accomplishes this by trapping air, eliminating significant convective heat loss and leaving only conduction and low radiation transmission. The main task of such insulation is to improve the thermal conductivity of the insulation relative to closed, standing air. A heat sink is any substance that can store large amounts of heat. Most often we think of concrete, brick, water, clay and soil as heat-absorbing materials used in construction. The property of a heat sink that performs the function of insulation is called thermal conductivity.

R-Value and U-Value

The R-value indicates how well the building material insulates. The higher the R-value, the better the insulation and the greater the energy saving. The R-value applies only to certain materials, not systems. What is the value of U? The U-value is usually used to evaluate door or window units. 

The lower the U-value, the more energy-efficient the system. The U-value is usually a small number because it indicates how much heat energy is lost or obtained. If we look at two mathematical values, the U-value is the inverse of the R-value.

 A high R-value means a low U-value, but the actual differences are much more complex. The U-value is more a technical term that describes the heat output. Traditionally, it was used for materials such as window systems, which consist of many different materials. 

The R-value is usually used for components that consist of only one material. When determining the R-value of a wall cavity (the area between the frame parts), you can add individual R-values, such as wall cladding, insulation, and internal plasterboard, to get the total R-value. 

This is not the case with U-values ​​because you cannot simply sum up the individual U-values ​​of each component. Take, for example, a window system. Each window is made of different materials, some of which have different functions. While some may prevent heat transfer, others may focus on air filtering or ventilation. The U-values ​​represent energy transfer by conduction and radiation, while the R-value only represents heat transfer resistance.

Use Appropriate Products

You should continue insulation above the floor of a creep space for about half a meter above the required floor steam retarder. Use a product without an upper layer or a product with adequate flame spread (surface burning characteristics) because the insulation is exposed. If rigid foam insulation boards are used to insulate the walls of a non-ventilated creep space, they can be glued to the wall with the recommended adhesives.

Use Construction Adhesives

Most builders carefully seal the perimeter of each floor panel with construction adhesive. Typically, these vents are cut through a perimeter beam, where they move the insulation and encourage air to enter the insulated room. It is better to block creeping ventilation holes in the foundation wall, where they do not affect the insulation.

Insulate the Walls

Leave the floor uninsulated and insulate the walls of the unventilated creep space. If slats or rollers are used on the bottom of the floor above an unheated creeper or basement, place insulation between the beams and press them against the floor as safely as possible without excessive compression of the insulation. Insulation strips can be cut and inserted manually into tight spaces. If you insulate an unheated crawl space or basement, you also need to insulate all channels or pipes that run through this space.

Put Insulation Between the Beams

If there is no insulation in the attic, put insulation between the beams. If the existing insulation is near or above the top of the beams, it is recommended to place new beams perpendicular to the old ones, as this will help cover the very top of the beams and reduce thermal bridges passing through the frame. Although the door area is small, an uninsulated attic door significantly reduces energy savings.

Add Thermal Insulation

If a new siding is to be installed, it is recommended to add thermal insulation under the new siding. Sometimes, rigid insulation can be used outside the sidewalls of the wall, such as concrete blocks or poured concrete. However, if this is not possible, you can use rigid insulation boards or strips to insulate the interior of masonry walls.

Install Hard Foam Insulation

During installation between wall posts, excellent wall insulation only eliminates heat conduction through insulation, but heat loss through materials such as glass windows and posts remains unchanged. Insulation installed between columns can reduce heat loss due to air leakage through the building envelope, but usually does not eliminate it. By installing a continuous layer of hard foam insulation on the outer surface of the wall cladding, the formation of thermal bridges is interrupted by studs, while the rate of air leakage is reduced.

Choose the Appropriate Insulation System

Rigid insulation is often used for foundations and as insulating wall cladding while reflective insulation systems are made of aluminium foils with various supports, such as wrapping paper, plastic film, polyethene blisters or cardboard. Heat flow resistance depends on the direction of heat flow, and this type of insulation is most effective in reducing downward heat flow.

The use of foam insulation outside the frame kit is common among passive house designers. While mineral wool is considered a hygroscopic (tends to absorb moisture) material and has its own moisture storage function, it is unique in that it is very permeable.

It pays to build a better knowledge base on the basic functional insulation used in existing constructions. Investigate the processes of minimising heat conduction, limiting the possibility of flowing into the property from the external environment and vice versa. Insulation films are available from a variety of materials and structures, including films, bulk materials, foams and more.

Within the insulation installation industry, BrandXXX is a leading name. We can install some of the highest performing insulation materials that perform optimally. Contact us for a free quote today.


  • Mortar joints can be taken into account by assessing the percentage of mortar surface in relation to the wall embedded in it. 
  • Wool insulation is made of sheep wool fibres that are either mechanically held together or combined into insulation mats and rolls with 5% to 15% recycled polyester glue. 
  • Hemp batts or rolls usually consist of 85% hemp fibre, and the rest consists of polyester binding and 3 to 5% fireproof soda. 
  • Glass mineral wool batts and rolls are made of molten glass, usually from 20% to 30% of industrial recycled and post-consumer waste. 
  • If moisture is a high risk (moisture penetration or relative humidity above 95%), a suitably resistant material must be determined. 
  • Hemp walls must be used together with a frame made of another material that can withstand vertical loads in construction since the density of hemp is 15% of the density of conventional concrete. 
  • CO2 represents over 99% of the gas in the cell chambers. 
  • Silicon dioxide solidifies into three-dimensional, interrelated clusters, which constitute only 3% of the volume. The remaining 97% of the volume consists of air in very small nanopores. 
  • Cavity wall-filling systems not only offer the best ratio of U-values ​​to wall widths but are also extremely cost-effective compared to alternative solutions. 
  • The walls of the house are the largest area through which heat can escape, and are therefore responsible for about 60% of the heat loss of a typical uninsulated house.