Short-term performance of wooden windows and facade elements made of thermally modified and non-modified Norway spruce in different natural environments

ABSTRACT

Thermally modified wood is becoming an increasingly popular material for different applications in buildings. Laboratory tests indicated a positive effect of thermal modification on durability, dimensional stability and thermal conductivity of wood. Therefore, windows and facade elements made of thermally modified Norway spruce and non-modified Norway spruce were tested in the field and installed in different test objects which were exposed at five locations in Europe (Slovenia, Germany, Sweden, and Spain). Results from monitoring showed that elements and windows made of thermally modified spruce (TMS) had considerably lower wood moisture content compared to the ones made of non-modified spruce and that wax further positively influenced moisture performance. Colour changes of TMS were more intensive compared to non-modified spruce but were successfully retarded by adding pigments to the wax. Mould and stain growth was largely dependent on the location, amount of precipitation and relative humidity.

KEYWORDS:

• Norway spruce
• thermal modification
• wax
• wooden facades
• wooden windows

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Aleš Ugovšek https://orcid.org/0000-0002-7620-7505

Miha Humar http://orcid.org/0000-0001-9963-5011

Additional information

Funding

The authors would like to acknowledge the support of European Commission in the frame of Horizon 2020, SME Instrument [project 666206 – WINTHERWAX].