In the materials section, you enter material-specific properties which can then be used to create constructions. The standard library in Vabi Elements contains a wide range of materials that you can easily copy into your project.

Publications construction library

The constructions that are included as standard in the Vabi Elements library come from the following publications:

Publicatie 60 (2004)

U- and R-values of building construction

Publicatie 32 (2011) Hoofdstuk 2 & bijlage C t/m F

Assumptions for temperature simulation calculations, physical material data

NEN 1068:2012/C1:2014

Thermal insulation of buildings – Calculation methods

NPR 2068:2002

Thermal insulation of buildings – Simplified calculation methods


Provide a recognizable name and any additional description in the description field.


As an aid to visualize the material layers of the constructions, you can also assign a hatch pattern to the material. The hatch pattern will be displayed when creating a construction.

Material data


There are two different types of input options:

  • Material: For a material, the thermal conductivity (lambda), density, and specific heat are specified.
  • Cavity: For a cavity, the thermal resistance is specified.

Thermal conductivity

The thermal conductivity coefficient λ expresses how much energy (in Watts) passes through a surface of 1 m² with a thickness of 1 m, per degree Kelvin temperature difference between both sides of the surface. The lower the λ value, the better the material insulates. Heavy materials have poor insulation properties. Porous materials insulate better. Moisture adversely affects the insulating properties.


Density is the volumetric mass. The moisture content and composition of the material largely determine the volumetric mass.

Specific Heat

Specific heat is the specific heat capacity or heat accumulating capacity of the material.


Publicatie 32 (2011) bijlage C

Physical properties of non-transparent materials

NPR 2068:2002, bijlage C

Table values for the thermal conductivity coefficient for masonry

NEN 1068:2012/C1:2014, Bijlage F

Thermal conductivity coefficients of selected materials, applied in windows and frames

Input data for a cavity

Thermal resistance

Thermal resistance is the thermal resistance of the cavity. A well-insulating cavity has a high R-value.


NPR 2068:2002, paragraaf 6.4

Calculation values for the thermal resistance of air layers and attic spaces

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