The peripheral insulation of walls

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THE PERIPHERAL INSULATION OF WALLS

 

The peripheral insulation of walls below ground level thermally insulates the building from external temperature fluctuations below ground level. It also protects the waterproofing layer against mechanical damage.


The most-important conditions which should be met for peripheral thermal insulation to perform its functions in an effective way are its proper implementation and the use of high-quality materials, with the features tailored to the particular application.

The parameters of the XPS PRIME S and XPS PRIME D panels are matched to the effective thermal insulation of basement walls, other walls, and foundation slabs, especially under conditions of direct contact with the ground and groundwater. The XPS PRIME S panels are characterised by excellent thermal-insulation parameters, low water absorption, high compressive strength, and high mechanical, biological and chemical resistance. It is also important that they are easy and quick to process and assemble.

Foundations insulation properly made of XPS PRIME S is able to continue to perform its function for decades.

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ZONES OF HEAT LOSS INTO THE GROUND

Designing and constructing energy-efficient houses require close cooperation between the designer and a building-physics specialist. All designed buildings are usually located in places with different soil and water conditions. Then it is necessary to conduct an analysis of heat-transfer coefficients U for the building envelope (roof, outer wall, foundation wall, floor on the ground) in order to achieve the desired heat demand of the building. The category of energy-efficient buildings includes buildings with an annual heating demand of 50 to 70 kWh/m2 of heated space. Currently in Poland, new standard buildings consume about 120 kWh/m2 per year.

When designing insulation thickness for floors on ground and foundation walls, the most- popular model of heat loss, on the basis of which calculations are carried out, is Henriksson’s model, dated 1959. It presents two zones of heat loss to the ground.

  • The edge zone, along the outer walls of the width w1. In this zone, the amount of heat loss Q1 depends on the atmospheric air temperature, tz
  • The central zone, where the outside air temperature does not affect the amount of heat loss Q2

The Henriksson model of heat loss into the ground

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