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Indoor climate and environment - gypsum can breathe

In the paragraph "Gypsum is the natures own material" the advantages of the gypsum related to indoor climate are expressed by the end-users.

The production of gypsum board, as mentioned, releases the gypsum crystal’s water content on heating. This breaks down the gypsum stone structure to white gypsum powder. In the manufacture of gypsum board water is added, after which the fluid gypsum mass is poured between two layers of cardboard liner. In the subsequent ”baking” the excess water is evaporated off and the gypsum board takes on its familiar form.

Gypsum board hardening is not based on the addition of reactive materials in the form of volatile liquids and suchlike. Nor, therefore, does the use of gypsum products cause health nuisances.

During gypsum board production, porosity is built into the board, allowing moisture to penetrate the material. This ability increases as the moisture load rises. Since the alkaline properties of the gypsum simultaneously increase in the process, this counters microfungal and similar fouling, which is normally widespread at high humidities.



Danogips is registered with the voluntary labelling scheme Dansk Indeklima Mærkning, DIM (Danish Indoor Climate Labelling). DIM is the first labelling scheme to deal with construction materials in the service phase. The purpose of indoor climate labelling is to improve the indoor climate in buildings. The areas covered by the indoor climate label are reviewed below.

Degasification
Declaration with a time value in days, termed the ”declared indoor climate value”. The time value is determined on the basis of the time it takes the most slowly degased individual substance to drop below the substance’s smell and irritation threshold.

Particulate discharge
Classification of the product based on the release of particles determined from sedimentable dust consisting of particles (including fibres) in the first part of the product’s lifetime. According to the standard, Danogips’ products rank in the best class, Certificate no. DK-008, untreated products. The declared indoor climate value has been established as 10 days, and particulate discharge classified as low. Certificate no. DK-007, finished products. The declared indoor climate value has been established as 10 days, and particulate discharge classified as low.

Transport and storage
One prerequisite for qualifying for Danish indoor climate labelling is also that products are transported, stored and installed in accordance with special instructions. The labelling indicates that the article must be
  • positioned on a level base
  • stored indoors
  • protected from direct moisture
  • protected from impact and shock
  • opened without the use of tools
  • stored at humidities of less than 70% RH
  • stored at temperatures of less than 50oC
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Last modified : Nov. 12, 2004
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