Repair of old timber log house using cavity filling with compatible natural materials

0570428 - ÚTAM 2024 RIV CH eng J - Journal Article
Kloiber, Michal - Frankeová, Dita - Slížková, Zuzana - Kunecký, Jiří
Repair of old timber log house using cavity filling with compatible natural materials.
Buildings. Roč. 13, č. 2 (2023), č. článku 550. E-ISSN 2075-5309
R&D Projects: GA TA ČR(CZ) TL03000377
Grant - others:AV ČR(CZ) StrategieAV21/23
Program: StrategieAV
Institutional support: RVO:68378297
Keywords : historical timber structures * heritage conservation * repair * timber * earth-based mortar * lime * casein
OECD category: Architecture engineering
Impact factor: 3.8, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/buildings13020550

The paper describes a method of structural repair to damaged elements of protected timber houses. Emphasis is laid on minimum intervention in the valuable material that needs to be preserved to the maximum possible extent, especially without larger interventions in the visible parts. The designs will find application in situations where it is not possible or appropriate to use common building methods, and it is necessary to carefully fill out or substitute bio-damaged parts of structural elements. The material for the production of fillings of structural elements corresponds to the originally used wood species - in the case of contact with the ground, oak is the choice due to its durability. Small caverns are filled with earth-based mortar with lime, casein, and chopped wheat straw. Such mortar mixtures were subjected to laboratory tests, which have shown that earth-based mortar (E) and earth mortar with lime putty modification (EL) have very similar physical, mechanical, and hygric properties. The properties significantly changed when curd cheese/casein was added to fresh mortar (ELC): the mechanical strength of hardened mortar increased substantially, and the diffusion of water vapours dropped, which is very beneficial for careful repairs of timber elements. The combination of timber and mortar filling provides a suitable means of repairing locally decayed timber members.
Permanent Link: https://hdl.handle.net/11104/0341728