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MOISTURE & MOLD In Construction. l Review l Solutions l Resources OUTLINE.

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Presentation on theme: "MOISTURE & MOLD In Construction. l Review l Solutions l Resources OUTLINE."— Presentation transcript:

1 MOISTURE & MOLD In Construction

2 l Review l Solutions l Resources OUTLINE

3 WHAT IS MOLD? l Molds are fungi l Living micro-organisms l Neither plant nor animal l Separate kingdom in biology l Found everywhere l Over 100,000 known species l Can be benign, beneficial or harmful l Essential part of our natural environment l Feed on nutrients present in most organic fibers l Vital decay & recycling mechanism

4 Found everywhere! Over 100 varieties grow in buildings Need clean room environment to control Spores Food sources which are found in most building materials Found in dust from construction and normal use Nutrients Must be liquid moisture! Roof leaks Pipe leaks WindowsCondensation Wet construction Moisture Temperature: 40 – 95 °F = ideal range CONDITIONS FOR MOLD GROWTH

5 Requires a clean room environment to eliminate Impossible to eliminate in general construction Eliminate Spores All materials in the system must eliminate food sources or be treated with broad- spectrum fungicides Dust & construction waste must be removed prior to closing up systems Remove Nutrients Good design & construction practices can manage water sources & system drying potentials Water events must be immediately addressed Water events must be immediately addressed Control Moisture ELIMINATING MOLD GROWTH

6 WHAT HAS CHANGED? l Buildings have become more weather tight l New materials & architectural design features l Fast track construction l Maintenance is a continuous lifetime concern

7 TESTING FOR MOLD GROWTH l Commonly used mold growth test methods are for interior coatings & plastics, not sheet product building material l Current test standards focus on individual products, not systems testing l There are no established permissible exposure level (PEL) limits l Air sampling & tape tests unnecessary l If you see or smell mold, fix the problem!

8 A MOISTURE CONTROL ISSUE l The only controllable factor linked to mold growth is moisture l Virtually any building material can be negatively impacted by mold if proper moisture management practices are not followed l Mold is a moisture control issue that must be managed by proper building design, construction, and maintenance practices l There are no silver bullets to solve the mold issue

9 ConstructionFirst yearRemaining life Key drivers l Weather l Wet construction processes l Site preparation & drainage l Job scheduling & logistics l Materials transport & storage l Dry out period for wet building materials l Poor construction l Occupancy & lifestyle factors l Poor design (e.g., condensation, leaks) l Catastrophic events l Occupancy & lifestyle factors l Wet construction processes l Concrete & Masonry l Structural framing lumber l Wet areas l Bathrooms l Kitchens l Indoor pools & locker rooms l Exposure to weather l Exterior sheathing l Shaft wall & Area separation walls l Structural framing l Building envelope leakage l Plumbing leaks Avoidable l Poor design & construction l Poor matls staging & storage l Poor design & construction l Poor HVAC design l Wet construction processes l Concrete & masonry l Poured flooring l Interior finishing l Building envelope leakage l Plumbing leaks l Improper HVAC operation l Poor maintenance & repair Intrinsic moisture sources Weather & other episodic exposures MOISTURE EXPOSURE IN BUILDINGS

10 REDUCING THE RISK OF MOLD Exposure to moisture during transportation and storage l Shipping companies l Distributors l Contractors l Develop best practices guidelines l Education/training Exposure to moisture during construction l Contractors l Develop best practices guidelines l Education Exposure to moisture after construction l Architects l Contractors l Maintenance companies l Develop best practice guidelines l Education Lever Primary influencer(s) Manufacturer responses Biocides l Product manufacturers l Contractors l Introduce safe and effective biocides into key products Food sources within building materials l Promote/develop inorganic offerings l Product manufacturers Water hold-out l Introduce water-repellent chemicals in products l ContractorsDrying of building materials l Develop guidelines and specifications Influence-based Product-based

11 SUMMARY l Spores + Nutrients + Water Mold l The key to mold control is moisture control l Molds can be found almost anywhere; they can grow on virtually any substance, providing moisture is present… - EPA l Materials must stay dry to prevent mold l Systems manage moisture, products do not There is no simple product solution for mold !!!

12 OUTLINE l Review l Solutions l Resources

13 Fire Resistance Sound Control Moisture Control Abuse Resistance Aesthetics Full spectrum of performance attributes Continue to the lead the industry in the development and positioning of products which address ALL critical attributes: OBJECTIVE

14 STRATEGY l Increase intensity of l Education & Communication l Building science / research l Product enhancement l Clear recommendations for the use of all products

15 NEW SHEETROCK ® BRAND HUMITEK l Attributes l Fire Resistance l Sound Control l Handling l Finishing l Moisture/Mold l ASTM D3273 = 8 l Thickness l ½ l 5/8 FC l Width l 48 Wide l Edge l Tapered l Paper l Light blue l Moisture Resistant l Core l Moisture Resistant l Patent Pending Mold Resistant Additive l New end tape design

16 NEW SHEETROCK ® BRAND HUMITEK l Where is it used? l Areas subject to intermittent moisture l Basements l Garages l Bathrooms (not tubs or showers) l Areas subject to weather during construction l Allows opportunity for building professionals to manage risk as needed

17 NEW SHEETROCK ® BRAND HUMITEK l Installation l Easy score and snap l Setting Type compounds l Paper joint tape l Sheetrock Brand First Coat l No itchy glass fibers l No skim coating necessary l Excellent performance without sacrificing productivity

18 ARCHITECT Architectural Record

19 CONTRACTOR Walls and Ceilings and Construction Dimensions

20 BUILDER Builder Magazine

21 NEW AQUA-TOUGH INTERIOR PANELS TOUGH TO THE CORE Abuse Resistant Finishes like standard SHEETROCK Brand gypsum panels Tile shear bond strength exceeds ANSI standard Moisture Resistant Mold Resistant Fire Resistant Certified Green-Environmentally friendly

22 USG PANELS WET AREA PERFORMANCE Product Moisture resistance Mold resistance Tile bond Ease of finish Relative Installed cost index SHEETROCK1 SHEETROCK WR SHEETROCK Humitek1.30 FIBEROCK Aqua-Tough DUROCK Cement Panels Low High Relative performance

23 APPLICATION PERFORMANCE CRITERIA Mold and moisture-related products Interior wall Specialty panels Incidental moisture High moisture Cavity shaft walls Area separation walls SHEETROCK Humitek FIBEROCK Aqua-Tough SHEETROCK e+ shaft wall liner ApplicationsProducts Tile backer board Tub, shower, and high- moisture areas FIBEROCK Aqua-Tough DUROCK Substrates Floors Exterior FIBEROCK Aqua Tough DUROCK Attributes highlighted Systems

24 OUTLINE l Review l Solutions l Resources

25 RESOURCES l Literature l Leading – WB2332 l Moisture Control – WB2325 l ASTM D3273 (FAQs) – WB2324 l Good Construction Practices – WB2334 l Storage and Handling – WB2333 l Repairing water-damaged building systems – WB2315 l Facts (Moisture, Mold & Ceilings) – SC2414 l 800 USG.4YOU l

26 RESOURCES

27 MOLD IS A MOISTURE MANAGEMENT ISSUE l The only controllable factor linked to mold growth is moisture l Virtually any building material can be negatively impacted by mold and moisture if proper practices are not followed l Mold must be managed by proper building design, construction, and maintenance practices l There are no silver bullets to solve the mold issue Nutrients Water (liquid moisture) Mold Spores (everywhere)


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