Paroc insulation moisture properties

The driest insulation on the market

Paroc stone wool insulation is one of the best performing insulation materials when it comes to overall moisture properties. Our confidence and statement is based on long experience as well as extensive experimental study and simulations done for various building insulation materials by an external independent laboratory.

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PAROC Moisture Guide Cover
Download the Paroc moisture guide and find out answers to the following questions:
  • How to plan a moisture-safe building?
  • How moisture-resistant is stone wool?
  • Does stone wool get mold?

3 reasons to choose Paroc stone wool

Erinomainen suorituskyky

Excellent performance

Paroc stone wool is, from a moisture technical perspective, one of the best insulation materials thanks to its versatile properties. Our trust in the excellent performance of stone wool is based on long experience as well as comprehensive tests and simulations performed by impartial research institutions and laboratories.

In the construction stage, the most important properties of the heat insulation is a low absorption of water and quick drying. A comprehensive study concerning heat insulation materials conducted by VTT (VTT-S-05337-17) has shown that there are differences between different insulation materials when it comes to moisture technical properties. 

Paroc stone wool

  • stays dry even in high humidity
  • does not absorb water
  • dries very quickly
  • no capillary water absorption
Turvallista rakentamista

Cost-effective construction

Most construction materials contain water, which needs to be able to escape the structures as quickly as possible already during the construction stage. How much moisture rain or humid air adds to the structures during the construction stage varies greatly between different materials. Even if the insulation does not get wet, the moisture level of the rest of the materials increases.

For this reason, the water vapour permeability of the insulation plays a key role when it comes to the drying time of the whole structure – insulation with high water vapour permeability allows moisture from the structures to escape in two directions.

Paroc stone wool

  • is diffusion-open, which means that it lets the surrounding structures dry in both directions
  • minimises the drying time for concrete structures, thus speeding up project timetables and significantly reducing costs
Turvallinen koti

A safe home

Mould is present everywhere – in the air and on almost all outdoor surfaces. Mould spores enter buildings for example through windows.

Mould starts growing if the relative humidity is high (≥ RH80 - 85%), the temperature is higher than 10 °C and there is sufficient organic materials to provide nutrients for the mould. If one of these conditions is not met, the mould will not grow.

Stone wool insulation is made from non-organic stone and provides no nutrients for mould. Paroc has commissioned mould tests for their stone wool in an impartial laboratory. The tests were conducted in a relative humidity of 95–100% and a temperature of 22 °C, using the most common types of mould. 

Paroc stone wool

  • will not become mouldy or cause other structures to become mouldy
  • does not contain flame retardants, which may contribute to corrosion in humid conditions

Moisture properties of Paroc stone wool

Hygroscopic balance moisture content, 98% RH 
(EN 12571:2013)

A comprehensive study conducted by VTT has shown that there are differences between different insulation materials when it comes to moisture technical properties. According to the study Paroc stone wool:

  • Stays dry even in high humidity
  • Does not absorb water
  • Dries very quickly
  • Does not absorb water capillary