6. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
7. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
8. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
9. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
10. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
11. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
12. AN INDUSTRY PERSPECTIVE (1) Cornick, S. and Rousseau, M.Z., “ Understanding the Severity of Climate Loads for Moisture-related Design of Walls ”, IRC Building Science Insight 2003 Seminar Series, Toronto, CA, Oct. 2003, pp.1 “ The fundamental function of the building envelope is its separation of the outside and the inside environments so that indoor conditions can be controlled to meet many requirements (for example, comfort and energy efficiency). The design and construction of durable, efficient walls requires consideration of climate loads to which these building components will be exposed. A wall assembly that is trouble-free in one area of country may not perform adequately in another. This is because although the building physics do not change, the heat, air, and moisture control strategies may need to integrate different levels of redundancy for different climate conditions. The severity of the climate for a building site cannot be changed, but it needs to be integrated in the design of the wall assemblies. Understanding the climate loads acting on building components is an important step towards effective design of moisture management strategies .” (1)
35. WHERE TO USE RAINSCREENS Rainscreen systems (drainage planes with ventilated air spaces) should be used whenever average rainfall is greater than 40 inches.” Joseph Lstiburek, Ph.D,, P.Eng. Building Science Corp.
Welcome Personal introduction Recognition / acknowledgement of host Express appreciation of their taking time from their busy schedule to attend this CEU (Continuing Education Unit) focused on “Moisture Management in Sidewall Construction”. Reiterate that their attendance this is good for 1 credit in the Health Safety & Welfare [HS&W] category. No test is necessary. Pass around a “sign-in” sheet (available on-line from AIA). Ask them to please PRINT their name and, if they would like credit to be recorded with AIA for Continuing Ed, please provide their AIA number as well. Inform them that for those in attendance who are NOT members but who would still like to receive a certificate of completion, please ask them to indicate as such on the sign-in sheet.
It is NOT necessary to say anything about this slide. ( I often skip past this altogether.)
Read these S-L-O-W-L-Y. Although they seem elementary, by reading them slowly it will help the attendees disengage themselves from the busyness of their day and to focus on the topic at hand. To the end of the 3 rd bullet point, add “where warranted”.
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
(Ask for permission of the attendees to read this quote. Read the paragraph slowly to allow the info to stick) : “ Permit me to READ this first important slide. It is an except from a study published by the IRC which is the research arm of CMHC---The Canadian Mortgage & Housing Corporation---the leading code body in Canada. It will help to establish a common point of reference that will be foundational to our understanding as the presentation evolves.” Once you’ve read it through completely, call their attention to this important sentence… “ A wall assembly that is trouble-free in one area of the country may not perform adequately in another”. Make the following statement: “To illustrate the importance of this, let me ask the following question”: What does Reno, Nevada and Baton Rouge, Louisiana, have in common?” (Allow them 5-10 seconds to think. Some may offer an answer or two.) Answer: CASINOS. However, one thing they DON’T have in common is RAIN ! Reno receives about 4” of rain per year, whereas Baton Rouge often receives 4” of rain per hour! Yet the casinos built in Baton Rouge in the last 7 years were almost identical to the ones built in Reno a decade before. And excessive moisture intrusion severely compromised the structural integrity of much of the assemblies of those casinos resulting in failure long before the brunt of the Katrina’s fury hit !
This Detail Shows: Principles of Moisture Movement dictate that moisture migrates from areas of HIGH HUMIDITY to areas of LOW HUMIDITY, from WARM to COLD. In some areas of the country, such as the South, this may be a bigger issue problem than in others, such as New England for example. However, it has often been said by leading Building Scientists that moisture intrusion as a result of vapor diffusion can best be measured in spoonfuls. Whereas moisture intrusion as the result of…(advance to next slide)
… Wind Driven Rain can best be measured in BUCKET-FULLS ! Wind driven rain is the real culprit in most cases. “ In addition to joints and laps, hose bibs, utility cutouts, and dryer vents can be a major source of entry where the caulk has failed under the UV (Ultra-violet) load or the settling of the house. All that is needed is a gap 1/64” inch for rain to be driven in.
So not only do we have a wind-load driving water into the wall, we also have simple physics actually siphoning or drawing the water in.
A break-down in the surface is often only an outward manifestation of larger problem inside the wall assembly.
This photo shows when a problem is no longer a “punch-list” item. Now it’s often a “Health, Safety and Welfare” problem! Mold claims have driven insurance premiums for builders through the roof. For every $1.00 in premiums collected, insurers have had to pay out $3.00 in claims as of the end of 2005. It is projected to climb to $7.00 by 2007. Hence the reason for the huge increases in premiums witnessed by contractors in the last 36 months.
Read through the bullet points on the slide. After reading thru this, Add mold needs a food source and moisture to grow. The cellulose in the wood and paper faced gypsum provides the food and the moisture is present in the relative humidity. An Rh of 70% provides a perfect petri-dish.
Again, read these slowly. Often referred to as the “4-D’s of Moisture Management.” An example of deflections : over-hangs Drying (add): “and a mechanism whereby the rate of drying exceeds the rate of wetting . If the rate of wetting exceeds the rate of drying, accumulation occurs. This is a basic principle of moisture management which leading building scientists subscribe to.
No speaker notes.
In simplest terms, when you create an 1/8” airspace (or 125 mil) between the cladding and the shear wall you create a capillary break that neutralizes the ability of the wall to siphon water in during a rain event. That’s what differentiates a rainscreen from a drain-screen . Enhanced WRBs with ribs, crinkles or dimples may provide better drainage compared to a regular WRB however they don’t provide the minimum air-space necessary to create a capillary break. The greatest thickness of any WRB only measures only 15 - 18 mils in height!
This map shows rain fall regions across North America. Leading Building Scientists recommend that rainscreen assemblies be used wherever the annual rain fall exceeds 40” Point out the region the viewer is in, noting how much rainfall occurs in their locale The basic difference between a vented rainscreen and a fully ventilated drain-screen is that a vented drainscreen is only open at the bottom, to weep out accumulated water. A fully ventilated drain-screen is open at the bottom as well as the top allowing for air to enter in thru the top opening and flush the system in a convective fashion providing the maximum air for drainage & drying. Remember, the basic principle cited earlier that “ the rate of drying must exceed the rate of wetting”. Air movement is required for drying to take place.
Ask audience about the disadvantages of installing a rainscreen wall in this way
Make note of the disadvantages above Another downsides of this practice is that 15 – 18 % of the wall is not ventilated as a result of the 1x3 furring 16” o.c. Even though the cost of the furring is relatively cheap, because of the labor to properly install the system, it typically costs around $1.25 The cost goes up significantly when ripped-down pressure treated CDX is used. $2.00 per sq ft is a common figure used by contractors when you figure the cost of anti-corrosive fasteners and labor into the equation
Shown here is Home Slicker. A product by Benjamin Obdyke and an example of “void space technology”. (Omit if presenting a true AIA presentation) It is proven to provide greater drainage & drying capability than wood strapping Installs in a fraction of the time Typical cost <$0.75 / sq ft 50 year warranty
Discuss the general installation sequence described in this illustration of a stucco application. Call exception to the use of a 2 nd layer of building paper used in this cutaway illustration to prevent clogging of channels by scratch-coat. (for stucco only)
Call attention to the use of fiberglass screen cloth used to prevent bugs / spiders from nesting in behind siding. This is a practice used with rain screen walls that are strapped out as well. Utilize HS display board for close-up
No speaker notes.
This is “boiler-plate” language found in CSI Manu-spec format. It is self-explanatory. After this slide ask if there are any questions.
After the Q&A, I often walk the attendees through our product literature packet and use it as an opportunity to present the other additions of the HS product line. If so, open up AIA CEU Presentation – PART 2 6-04-07
![[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)