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Construction moisture management, nail-laminated timber

https://library.fpinnovations.ca/fr/permalink/fpipub8035
Auteur
Wang, Jieying
Date
March 2021
Genre du document
Research report
Domaine
Sustainable Construction
. While “S-Dry” dimension lumber has moisture content (MC) of around 19% or lower when it is produced
Auteur
Wang, Jieying
Date
March 2021
Genre du document
Research report
Description physique
6 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Advanced Wood Materials
Sujet
Laminate product
Performance
Wood frame
Moisture content
Série
InfoNote 2021 N 15
Langue
English
Résumé
Nail-laminated timber (NLT) is a large built-up member often used as interior structural members for floors, roofs, walls, and elevator/stair shafts. Because prolonged wetting of wood may cause staining, mould, excessive dimensional change (sometimes enough to fail fasteners), and even result in decay and loss of strength, construction moisture is an important consideration when building with NLT. This document aims to provide technical information to help architects, engineers, and builders assess the potential for wetting of NLT during building construction and identify appropriate actions to mitigate the risks.
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Gestion de l'humidité en construction, bois lamellé-cloué

https://library.fpinnovations.ca/fr/permalink/fpipub8036
Auteur
Wang, Jieying
Date
Mars 2021
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Wang, Jieying
Date
Mars 2021
Genre du document
Research report
Description physique
7 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Advanced Wood Materials
Sujet
Laminate product
Performance
Wood frame
Moisture content
Série
InfoNote 2021 N 15
Langue
French
Résumé
Le bois lamellé-cloué (NLT – Nail-laminated Timber) est un élément massif composé de bois de sciage souvent utilisé comme élément de structure intérieur pour les planchers, les toits, les murs et les cages d'ascenseur/escalier. Étant donné que l’humidification prolongée du bois peut provoquer des taches, de la moisissure, des variations dimensionnelles excessives (parfois suffisantes pour provoquer la défaillance des attaches), et même la pourriture et la perte de résistance, l'humidité est un facteur important à prendre en compte lors de travaux de construction avec du bois lamellé-cloué. Le présent document vise à fournir de l’information technique pouvant aider les architectes, les ingénieurs et les constructeurs à évaluer les risques d’humidification du bois lamellé-cloué pendant la construction de bâtiments et à prendre les mesures appropriées pour atténuer ces risques.
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Preventing sinkage of western hemlock, Best practices guide

https://library.fpinnovations.ca/fr/permalink/fpipub53003
Auteur
Friesen, Charles
Date
January 2020
Genre du document
Research report
Domaine
Fibre Supply
-222-5622 charles.friesen@fpinnovations.ca 3 Western hemlock can have higher moisture content than
Auteur
Friesen, Charles
Date
January 2020
Genre du document
Research report
Description physique
12 p.
Secteur
Forest Operations
Domaine
Fibre Supply
Champ de recherche
Forestry
Sujet
Trees
Moisture content
Water
Transport
Série
Special Publication ; SP 538
Langue
English
ISBN
9780864885890
ISSN
19250509
Résumé
Hemlock can have higher moisture content than most other native trees, causing them to sink. Hemlock lumens have large pits (valves) that allow easy transport of water into the wood. Bigger rings = bigger lumens. Younger hemlock or hemlock tops are more susceptible to sinking. The bigger the rings the more likely to take on water.
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Drying of balsam and subalpine fir: for a better understanding

https://library.fpinnovations.ca/fr/permalink/fpipub52906
Auteur
Lavoie, Vincent
Date
November 2019
Genre du document
Research report
Domaine
Wood Manufacturing & Digitalization
moisture content Wet pockets Vincent Lavoie, Senior Researcher, Smart Manufacturing DRYING OF BALSAM
Auteur
Lavoie, Vincent
Date
November 2019
Genre du document
Research report
Description physique
4 p.
Secteur
Wood Products
Domaine
Wood Manufacturing & Digitalization
Champ de recherche
Advanced Wood Manufacturing
Sujet
Air drying
Balsam
Drying
Fir
Logs
Lumber
Moisture content
Performance
Sawmills
Subalpine fir
Wet pockets
Wood yards
Série
FPI WP 2019
Langue
English
Résumé
The findings of recent studies from both eastern and western Canada have shown that the drying behaviour of subalpine fir (A. lasiocarpa) and balsam fir (A. balsamea) is similar, which allows common solutions to be applied based on research conducted on one species of fir or the other. This article summarizes previous research findings and good practices that can be adopted in the short term to improve the drying of fir.
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Séchage du sapin baumier et subalpin: pour une meilleur compréhension

https://library.fpinnovations.ca/fr/permalink/fpipub52907
Auteur
Lavoie, Vincent
Date
November 2019
Genre du document
Research report
Domaine
Wood Manufacturing & Digitalization
Auteur
Lavoie, Vincent
Date
November 2019
Genre du document
Research report
Description physique
4 p.
Secteur
Wood Products
Domaine
Wood Manufacturing & Digitalization
Champ de recherche
Advanced Wood Manufacturing
Sujet
Air drying
Balsam
Drying
Fir
Logs
Lumber
Moisture content
Performance
Sawmills
Subalpine fir
Wet pockets
Wood yards
Série
FPI WP 2019
Langue
French
Résumé
Des travaux récents tant dans l’est que dans l’ouest du Canada ont montré que le comportement au séchage du sapin subalpin (A. lasiocarpa) et du sapin baumier (A. balsamea) est similaire, ce qui permet une application de solutions communes à partir de travaux effectués sur l’une ou l’autre variété de sapin. Le présent document se veut une revue sommaire de résultats de travaux antérieurs et de bonnes pratiques pouvant être adoptées à court terme pour améliorer le séchage de cette essence.
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Flotation of western hemlock

https://library.fpinnovations.ca/fr/permalink/fpipub52863
Auteur
Friesen, Charles
Date
May 2018
Genre du document
Presentation
Domaine
Fibre Supply
PDF
Ajoutez cet article à votre liste de sélections pour demander le PDF - Add this item to your selection list to request the PDF
Abstract There was no change to the moisture content of any of the western hemlock log sample sets
Auteur
Friesen, Charles
Date
May 2018
Genre du document
Presentation
Description physique
12 p.
Secteur
Forest Operations
Domaine
Fibre Supply
Champ de recherche
Forestry
Sujet
Trees
Moisture content
Water
Transport
Série
Report
Langue
English
Résumé
There was no change to the moisture content of any of the western hemlock log sample sets during the study period between 1 Dec 2014 and 5 mar 2015. It seems that this lack of change is related to stability in environmental humidity experienced by the logs. Whether or not time since cutting influences the ability of Hw logs to change moisture content could not be conclusively determined by the study.
PDF
Ajoutez cet article à votre liste de sélections pour demander le PDF - Add this item to your selection list to request the PDF
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Hemlock drying update: 2016/17

https://library.fpinnovations.ca/fr/permalink/fpipub49818
Auteur
Friesen, Charles
Date
March 2018
Genre du document
research report
Domaine
Fibre Supply
Auteur
Friesen, Charles
Date
March 2018
Genre du document
research report
Description physique
2 p.
Secteur
Forest Operations
Domaine
Fibre Supply
Champ de recherche
Forestry
Sujet
Wood
Drying
British Columbia
Moisture content
Série
InfoNote ; 2018 n. 7
Langue
English
Résumé
The problem of second-growth western hemlock (Tsuga heterophylla) sinking when watered continues to plague the coastal logging industry of British Columbia. A study conducted by FPInnovations in 2015-16 concluded that felled hemlock logs took two distinct trajectories in their drying patterns through time, depending on whether they were felled before or after May.
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Mill trial of log storage age effects on veneer production and using LogdryTM to predict douglas fir log residual moisture contents

https://library.fpinnovations.ca/fr/permalink/fpipub52647
Auteur
Semple, Katherine
Dai, Chunping
Date
August 2018
Genre du document
Research report
Domaine
Sustainable Construction
the start of the growing season when the moisture content in the sapwood of Douglas fir tends to be lower
Auteur
Semple, Katherine
Dai, Chunping
Date
August 2018
Genre du document
Research report
Description physique
27 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Logs
Storing
Aging
Veneer
Moisture content
Série
Industry Partnership
Langue
English
Résumé
This study was conducted with the aim of assessing the effects of log storage time and conditions at a BC mill yard on veneer production under mill production conditions. The second objective was to validate the FPInnovations LogdryTM drying model for developed for wood piles in Eastern Canadian mills. The software was used to generate drying rate predictions under the BC mill’s prevailing weather conditions and storage times for comparison with some measured residual moisture contents of Douglas fir logs kept in storage at the mill for six and nine months, sampled and peeled in a laboratory trial in 2016. The 2016 lab trials suggested little effect of lengthy (winter) storage up to 9 months but mill experience suggests this is excessively long and logs deteriorate in terms of veneer production and quality considerably earlier. Unfortunately due to experimental circumstances the mill peeling trials for the 9 month stored logs were unable to provide an accurate assessment of the true effect on production. Mills trials indicated % heavy sap had remained fairly stable largely within the mill target of 14% to 17% over the storage periods. During the mill trials there were unavoidable heavy confounding effects of different average diameter for log groups and peeler knife condition affecting the expected veneer production variables. The trials also demonstrated how pile size and height play a major role in protecting logs from drying; with very dry logs having a deleterious effect on veneer production. Logs held in small piles for 12 months or more, even with artificial ‘drying retardants’ such as end sealant and tarping were too dry for reliable peeling, causing very rapid knife wear, spinouts, veneer break-up and line blockages and significant lost recovery. The % heavy sap offtakes from these trials were just 2% to 4%. LogDryTM provides a fairly good estimate of likely drying rate trends of mid-sized (35 cm/14” to 41 cm/16” range) Douglas fir under the BC mills historic weather conditions over 6 and 9 months. LogDryTM (Birch setting) was closest to measured log MC in large diameter (46 cm/18”) logs but the Aspen setting was closer to measured MC in small logs (<30 cm/12”). In the limited sample of logs available from the mill in 2016 the 12” logs were much drier after 9 months storage than the model predicted, even on the Aspen setting. Further sampling of piled logs in the small diameter range is needed to verify this observation. LogDryTM was used to estimate drying rates of logs stored before or after Summer. Modelling indicated a shorter viable storage window for logs delivered before Summer compared to just before Winter, especially in the 6-month range. Residual log MCs were very similar after 12 months regardless of start time. Further work is required to better calibrate LogdryTM for major Western Canadian species, particularly Douglas fir, Spruce and Lodgepole pine, and reduce the calculation time for simulations. Further adjustment may be needed for simulating real drying rates in very small logs. The model assumption of similar residual MC after 12 months regardless of start time also needs to be verified.
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Instrumentation for monitoring performance in a six-storey building in Vancouver built for high energy performance

https://library.fpinnovations.ca/fr/permalink/fpipub7512
Auteur
Wang, Jieying
Thomas, Tony
Date
March 2018
Édition
49833
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Wang, Jieying
Thomas, Tony
Collaborateur
Natural Resources Canada. Canadian Forest Service
Date
March 2018
Édition
49833
Genre du document
Research report
Description physique
24 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Advanced Wood Materials
Sujet
Monitoring
Performance
Buildings
Energy
Moisture content
Air
Série
Transformative Technology ; TT 2018
Langue
English
Résumé
This report documents the instrumentation installed for monitoring moisture, indoor air quality and differential movement performance in a six-storey building located in the City of Vancouver. The building has five storeys of wood-frame construction above a concrete podium, providing 85 rental units for residential and commercial use. It was designed and built to meet the Passive House standard and, once certified, will be the largest building in Canada that meets this rigorous energy standard. Although the design and construction focused on integrating a number of innovative measures to improve energy efficiency, much effort was also made to reduce construction costs. One example of the design measures is the use of a highly insulating exterior wall assembly that integrates rigid insulation between two rows of wall studs as interior air and vapour barriers. This monitoring study aims to generate data on long-term performance as part of FPInnovations’ effort to assist the building sector in developing durable and energy efficient wood-based buildings, which is expected to translate into reduced energy consumption and carbon emissions from the built environment. The monitoring focuses on measuring moisture performance of the building envelope (i.e., exterior walls, roof, and sill plates); indoor environmental quality including temperature, humidity, and CO2; and vertical differential movement between exterior walls and interior walls below roof/roof decks. In total, 79 instruments were installed during the construction. The next steps of this study will focus on collecting and analysing data from the sensors installed, and assessing performance related to the building envelope and vertical differential movement. FPInnovations will also collaborate with CanmetENERGY of Natural Resources Canada to monitor heat recovery ventilators and to assess whole-building energy efficiency and occupant comfort. This is expected to start after the mechanical systems are fully commissioned during occupancy. Results of these upcoming phases of work will be published in future reports.
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Hemlock drying in coastal BC: 2015-2016

https://library.fpinnovations.ca/fr/permalink/fpipub49817
Auteur
Friesen, Charles
Date
March 2018
Genre du document
Research report
Domaine
Fibre Supply
, there are two distinct trajectories for hemlock wood moisture content, depending on if the tree was felled
Auteur
Friesen, Charles
Date
March 2018
Genre du document
Research report
Description physique
25 p.
Secteur
Forest Operations
Domaine
Fibre Supply
Champ de recherche
Forestry
Sujet
Wood
Drying
British Columbia
Moisture content
FPI TR
Série
Technical Report ; TR 2018 n.14
Langue
English
Résumé
Based on the data from this study and a literature review, there are two distinct trajectories for hemlock wood moisture content, depending on if the tree was felled before or after May. Hemlock trees felled before May gain the full benefit of spring drying according to the ambient conditions of their local micro-climate. Trees felled after May suffer from a physiological spike in moisture content that the tree generates to promote its growth and survive the summer soil drought.
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56 notices – page 1 of 6.