ISO 22185-1-2021 pdf free download – Diagnosing moisture damage in buildings and implementing countermeasures — Part 1: Principles, nomenclature and moisture transport mechanisms.
7.7Deformation
Change in the shape of an object due to stress from expansion or shrinkage.
Related terms: expansion, high humidity,shrinkage, low humidity, warpage, floating.7.8Dissolved destructive elements
Water transport of dissolved,destructive elements (e.g. salt, acid rain) which cause accelerateddeterioration of building materials.
Related term: corrosion (electrolytic) of metal.7.9 Dissolution
Refers to various materials where the performance is compromised due to water activity or moisture.In this document, it refers to materials that re-emulsify when in prolonged contact with water.
Related term: wetting.
7.10 Expansion
Increase dimension or volume of an object.This is due to physicochemical causes such as rise intemperature and humidity. In this document, this term mainly means that the volume of porousmaterials increases due to moisture absorption. Also， when moisture inside a material freezes,expansion occurs.
Related terms: high humidity, wetting, freezing,swelling, thrust up.7.11 Floating
This means that a bonded surface, or a coated overlaid surface, disengages.For example,mortarsapplied to a concrete substrate or plastered foundation layers and tiles delaminate due to drying andshrinkage.This is also known as “skin separation”. It is also an indication of a state in which the insideof the material expands due to frost damage, peeling occurs and the surface rises.
Related terms: peeling, exfoliation, delamination, adhesion loss, freezing.
7.12 Floor squeak/floor squeaking
This is the squeaking sound that comes from the gap between the floor material and underlayment.Also refers to the rustling sound caused by the floor’s (mainly the flooring’s) joints. This is caused byshrinkage, expansion, floating or warpage of the material.
Related terms: expansion, warpage, shrinkage, floating.
7.13 Freezing
Freezing is the change of the physical state of water from liquid to solid. Water expands when it freezesand can cause damage to the material it is in.The repetition of freezing and thawing of moisture withinthe porous materials may cause cracking or peeling. Freezing of the inside of insulation materialsignificantly lowers the performance of thermal insulation. In cold districts, freezing may occur in theopenings, and lower the visibility of the window, or may prevent it from opening or closing.
Related terms: frost heave, crack/cracking, peeling,exfoliation, delamination, adhesion loss,expansion.7.14 Frost heave
lt refers to the heaving of soil. lt occurs when the moisture in the soil freeze under low temperature andexpand to heave.
Related term: freezing.7.15 Wood decay
There exist many kinds of fungi in our living environment, but this document refers mainly to the decayfungi of wood. Decay fungi invade internal tissues of lumber, and cause discolouration, deformationand destruction. In case of structural materials, it leads to the decrease of durability and a tremendousdamage.Some fungi dissolve mainly cellulose while others dissolve lignin, and even more exist withuncertain behaviour.
Related terms: mould, rot, fungi.7.16 Gap
Change in the space between objects due to deformation such as shrinkage due to desorption orwarping due to adsorption or absorption.
Related terms: shrinkage,low humidity, high humidity, deformation warpage.7.17 Hardening
Refers to material property changes due to losing moisture.Related term: low humidity.
7.18 High humidity
lt means that the moisture level in the air is high and humid. lt is expressed by either relative humidityor absolute humidity. There is no clear threshold to display high humidity, but if such conditioncontinues, wood materials specifically are easy to expand under high humidity. It may also inducecondensation and lead to condensation damage.Chemical substances are emitted at a faster rate if thematerial is moist (for example, smell from linoleum mats).T’he room air relative humidity increases inproximity to a surface with lower temperature and can result in condensation or exceed the criticalrelative humidity.ISO 22185-1 pdf download.