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Experimental investigation on the effect of detail design on wood moisture content in outdoor above ground applications

Isaksson, Tord LU and Thelandersson, Sven LU (2013) In Building and Environment 59. p.239-249
Abstract
An essential part of a performance-based service life design format for wood exposed in outdoor applications is the effect of proper detailing in terms of avoiding moisture traps. Models for predicting degradation and non-performance caused by decay are functions of arbitrary climate history of combined moisture content and temperature. Therefore it is crucial to be able to predict the behaviour of different detailing in terms of moisture content exposed to outdoor climate. An experimental study was made with continuous moisture content measurements of different details. The different detail set-ups are selected to represent a wide range of sawn timber dimension details of non-treated Norway spruce. Hourly moisture content values are... (More)
An essential part of a performance-based service life design format for wood exposed in outdoor applications is the effect of proper detailing in terms of avoiding moisture traps. Models for predicting degradation and non-performance caused by decay are functions of arbitrary climate history of combined moisture content and temperature. Therefore it is crucial to be able to predict the behaviour of different detailing in terms of moisture content exposed to outdoor climate. An experimental study was made with continuous moisture content measurements of different details. The different detail set-ups are selected to represent a wide range of sawn timber dimension details of non-treated Norway spruce. Hourly moisture content values are recorded by a wireless monitoring system and the climate is monitored using a weather station. A simple horizontal board with no detailing is chosen as reference detail. This is, apart from a vertical board and sheltered details, what can be expected to be a good detail in terms of not trapping water. The remaining details show higher moisture content levels. It was found that the ratio between moisture content in a detail and in the reference detail showed a reasonably constant value over time. Consequently the behaviour of an arbitrary detail can be estimated by scaling the behaviour of the reference detail up or down using a constant value. Depending on the design the constant will be higher for more water trapping details and vice versa. This is important information and input for evaluating and developing details with acceptable performance. (C) 2012 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Moisture content, Wood, Detail, Design, Durability, Moisture trap
in
Building and Environment
volume
59
pages
239 - 249
publisher
Elsevier
external identifiers
  • wos:000314371900023
  • scopus:84870411607
ISSN
1873-684X
DOI
10.1016/j.buildenv.2012.08.023
language
English
LU publication?
yes
id
d2d197cd-a7d2-408c-9f01-00c2022cf4f2 (old id 3590039)
date added to LUP
2013-03-20 09:19:19
date last changed
2019-05-14 02:22:53
@article{d2d197cd-a7d2-408c-9f01-00c2022cf4f2,
  abstract     = {An essential part of a performance-based service life design format for wood exposed in outdoor applications is the effect of proper detailing in terms of avoiding moisture traps. Models for predicting degradation and non-performance caused by decay are functions of arbitrary climate history of combined moisture content and temperature. Therefore it is crucial to be able to predict the behaviour of different detailing in terms of moisture content exposed to outdoor climate. An experimental study was made with continuous moisture content measurements of different details. The different detail set-ups are selected to represent a wide range of sawn timber dimension details of non-treated Norway spruce. Hourly moisture content values are recorded by a wireless monitoring system and the climate is monitored using a weather station. A simple horizontal board with no detailing is chosen as reference detail. This is, apart from a vertical board and sheltered details, what can be expected to be a good detail in terms of not trapping water. The remaining details show higher moisture content levels. It was found that the ratio between moisture content in a detail and in the reference detail showed a reasonably constant value over time. Consequently the behaviour of an arbitrary detail can be estimated by scaling the behaviour of the reference detail up or down using a constant value. Depending on the design the constant will be higher for more water trapping details and vice versa. This is important information and input for evaluating and developing details with acceptable performance. (C) 2012 Elsevier Ltd. All rights reserved.},
  author       = {Isaksson, Tord and Thelandersson, Sven},
  issn         = {1873-684X},
  keyword      = {Moisture content,Wood,Detail,Design,Durability,Moisture trap},
  language     = {eng},
  pages        = {239--249},
  publisher    = {Elsevier},
  series       = {Building and Environment},
  title        = {Experimental investigation on the effect of detail design on wood moisture content in outdoor above ground applications},
  url          = {http://dx.doi.org/10.1016/j.buildenv.2012.08.023},
  volume       = {59},
  year         = {2013},
}