Www.fpinnovations.ca Control of Moisture Content in Wood for Mould Growth Dian-Qing Yang IUFRO All Division 5 Taipei 29 Oct-2 Nov, 2007.

Slides:

Advertisements

Similar presentations

Uses no particle board or MDF (medium density fiberboard). Cabinetry emits 0% Formaldehyde Cabinetry emits 0% Hazardous Air Pollutants (HAPs) Cabinetry.

Advertisements

What you should know about Wood

Selecting Lumber.

The effect of Katrina in the Gulf Coast: A study in Mold Proliferation Dr. Blanca Cortes Microbiology Laboratory Director and General Manager

Materials for Civil and Construction Engineers CHAPTER 10 Wood

 The lumber industry is able to provide a larger quantity and a greater variety of wood species because of:  Research  Conservation  Technology.

Toxic Mold Assessment, Mitigation, and Prevention at DOD Facilities Kim Taylor, Esq., CHMM, Presenter 08 April 2004 Kim Taylor, Esq., CHMM, Presenter 08.

Wood Decay Fungi. Types of wood decay fungi Wood-decay fungi can be grouped in various ways: by their method of degrading wood, which reflects fundamental.

Composite Panel Products for Stage Scenery 2005 USITT Conference & Stage Expo, Toronto, CA March 16-19, 2005 John F. Hunt, P.E. Research Mechanical Engineer.

Markku Seuri, FIOH, MOULDY HOUSE PROBLEM Tartu

Atmospheric Moisture. How does the moisture get in the atmosphere?? EVAPORATION TRANSPIRATION – water evaporated from trees.

Air temperatureRelative humidityAir movement Surface temperatures Air quality (IAQ) Lighting quality quantity Acoustics Security Building Envelop -The.

Is Your Home Making You or Your Family Sick? Ten Things You Should Know about MOLD.

PRESENTS Mold What you should know.. What is mold? Mold is considered a sub-group of the Fungi Kingdom Mold are asexual fungi Present on clothing, carpet,

WHAT DOES MOLD MEAN? by J. H. Haines New York State Museum Biological Survey Albany, NY.

2007 IUFRO All Division 5 Conference, Taipei An Investigation on Variations of some of the physical and biometrical properties of planted Acer Velutinum.

1 Sara Pourabbasi IUFRO Division 5 Conference Forest Products IRG/Wood Protection.

RG/WP 5.03 – IRG E Insect factor in wood protection.

Air Pressure Can you feel it?.

Air Pressure Air Pressure Just how does it work?.

HARDWOOD LUMBER. CROSS SECTION OF A TREE GRADING HARDWOODS Hardwood lumber is graded on the basis of the size and # of cuttings which can be obtained.

* The relative measure of the amount of water vapor in the air * Psychrometer * Water vapor affects the density of the air. * Cold air is heavier than.

MODULE THREE – ROOF DECK AWARENESS. The employer shall determine if the walking/working surface on which its employees are to work have the strength.

Residential Construction Unit 6 Interior finishes Mr. Todzia.

Wood Utilization—Wood Industry in North America. How much wood is used in building a house? For a 2000 ft 2 wood-framed house 16,2000 board ft. (1 bf.

WATER DAMAGE INVESTIGATIONS MORE THAN SUCKING AIR Connie A. Morbach, M.S., CHMM, CIE, ASCS Sanit-Air, Inc North Main/ Clawson, MI

Lumber one of the World’s oldest construction material.

Structural Drying Open enclosed areas (walls, floors) Drying may take several days or weeks.

Source Strength Source Strength Removal Rate Removal Rate Ventilation and IAQ.

General Woodworking Units 2 & 3 Wood Properties Mr. Nelson Darien High School.

Wood Structure and Properties

Selecting and Identifying Materials

ENVIROPAK WP1 - Establishment of base-line data of cashew nut stored at different temperature and Relative humidity (Maida Khan, Borges Chambal, Asmina.

Moisture Moisture = Water Vapor (gas) Gets into the atmosphere by: 1.Evaporation = liquid to gas (opposite of condensation) 2.Transpiration = plants release.

Fire and Fuels 8/31/2010. OXYGEN HEAT FUEL THE FIRE TRIANGLE FIRE.

Deciduous Trees such as Oak, Locust, & Maple. Rarely used in Landscape Construction, because of checking, splitting, and discoloration. Less resistance.

* The relative measure of the amount of water vapor in the air * Psychrometer – measures the humidity * Water vapor affects the density of the air. * Cold.

Use of thermally modified wood in building constructions Prof.dr. Franc Pohleven University of Ljubljana Biotechnical Faculty,

HARDWOOD LUMBER.

Lumber production and Types

TECH 320 – Non-Metallic Processes Lumber Lecture Deacon Band.

Processes Used to Form Wood Materials Chapter 16.

Ch students per table 2.Workbook & Textbook 3.Pencil / Pen 4.Start when quiet.

 100km x 12hr x 4+ days  British Columbia – Newfoundland  km² Almost half of Canada.

Wood Wood is one of the most adaptable and versatile of materials. It has been used in manufacture for thousands of years. Examples of wooden products.

MOLD. “The earth is a moldy planet, and has been for over a billion years” “The earth is a moldy planet, and has been for over a billion years” Mac Pearce.

COMPARISON OF DETERIORATION OF RYE UNDER DIFFERENT STORAGE REGIMES.

* The measure of the amount of water vapor in the air * Psychrometer * Water vapor affects the density of the air. * Cold air is more dense than warm.

1 Mold and Mildew Awareness Indoor Air Quality. 2 Toxic Mold A few years ago, few people had ever heard of "Toxic Mold“ Stachybotrys  $100 million lawsuits.

Equilibrium Moisture Content (EMC) in Drying

Wood Technology.

WATER IN WOOD Free Water is in cell lumens, and intercellular spaces.

State Practice Exam Wood Characteristics.

Environmental Perspective of Selected Interior Surface Material

Seasoning of Timber Grade 8.

A REPLACEMENT FOR SOLID TIMBER

Mold Ecology Kenneth Hellevang, Ph.D., P.E.

Engineered Building Products

Current Forest Industries in Saskatchewan

Factors Affecting Evaporation

Objectives Indoor Environmental Control Psychometrics.

by J. H. Haines New York State Museum Biological Survey Albany, NY

Air Pressure Can you feel it?.

Material Properties – Natural & Manufactured Boards

Air Pressure Can you feel it?.

Independently owned and operated

Air Pressure Can you feel it?.

Air Pressure Can you feel it?.

Presentation transcript:

Control of Moisture Content in Wood for Mould Growth Dian-Qing Yang IUFRO All Division 5 Taipei 29 Oct-2 Nov, 2007

Wood utilisation in buildings

Mould growth in buildings

Wood decay in buildings

Wood deterioration Soft-rot Internal cellulose and lignin BIODETERIORATIONFUNGIBIODETERIORATIONFUNGI White-rot Brown-rot Deep stain (sapwood)Deep stain (sapwood)

Mould and surface stain

Problems and economical impact Aesthetic effect Health effect – allergens – airborne mycotoxins Cost for replacement.

Toxic mould Stachybotrys chartarum ( S. atra ) Aspergillus spp. Fusarium spp. Paecilomyces variotii

Mould growth On virtually any substrate Can be found almost anywhere There is no way to eliminate all moulds The way to control indoor mould growth is to control moisture.

Limiting conditions for mould growth Determine water absorption rates of different wood materials in various humidity conditions. Determine minimal water requirement for mould growth on different wood materials. Predict mould growth on wood structures in buildings.

Wood materials tested Solid wood: jack pine, black spruce and balsam fir Aspen OSB Spruce plywood Medium density fiberboard (MDF) Gypsum board

Test methods Condition wood samples to moisture content 8%. Place samples in environmental chambers at 21°C and relative humidity from 65% to 100%. Determine moisture content of samples and inspect mould growth weekly for 8 weeks.

Water absorption from air by jack pine wood at 21°C and various RHs

Water absorption from air by black spruce wood at 21°C and various RHs

Water absorption from air by balsam fir wood at 21°C and various RHs

Water absorption from air by OSB at 21°C and various RHs

Water absorption from air by plywood at 21°C and various RHs

Water absorption from air by MDF at 21°C and various RHs

Water absorption from air by gypsum board at 21°C and various RHs

Water absorption from air by various wood materials at 65% RH

Water absorption from air by various wood materials at 79% RH

Water absorption from air by various wood materials at 86% RH

Water absorption from air by various wood materials at 94% RH

Water absorption from air by various wood materials at 100% RH

MC (%) of wood materials started to be affected by mould Jack pine wood: 19.3 Black spruce wood: 21.5 Balsam fir wood: 19.4 Aspen OSB: 20.2 Spruce plywood: 22.7 Medium density fiberboard: 19.3 Gypsum board: 18.2

Time (week) requirement for mould growth on wood materials at 94% RH Jack pine wood: 5 Black spruce wood: 6 Balsam fir wood: 6 Aspen OSB: 5 Spruce plywood: 5 Medium density fiberboard: 5 Gypsum board: 5

Time (week) requirement for mould growth on wood materials at 100% RH Jack pine wood: 3 Black spruce wood: 6 Balsam fir wood: 5 Aspen OSB: 2 Spruce plywood: 2 Medium density fiberboard: 2 Gypsum board: 2

Mould growth on various wood materials

Conclusion and future effort Mould growth on wood materials is generally related to the water absorption rates of the materials, usually a material with a higher water absorption rate is easier to be affected by mould than those materials with lower rates. Studies on water absorption rates of the wood materials by water intrusion from one side and all sides, as well as the drying speed in different environmental conditions are underway.