Architect 2014-03.pdf
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CONTINUING EDUCATION<br />
Typically, rigid foam sheathing is usually used<br />
on the exterior side of the cavity insulation (and<br />
the exterior side of the wall framing system).<br />
The weather resistive membrane separates<br />
the insulated sheathing from the air gap in<br />
the rainscreen wall system. Alternatively, the<br />
foam sheathing may be used on the interior<br />
side of the frame wall. Either approach offers<br />
the advantage of minimizing thermal bridging,<br />
especially when steel framing is used.<br />
It is very important to use caution when using<br />
rigid foam sheathing. Rigid foam sheathing<br />
affects the moisture management strategy<br />
for the wall system. Some types of rigid<br />
foam sheathing are relatively impermeable,<br />
and moisture may be trapped inside a wall<br />
system. Such walls may have more limited<br />
drying potential. Further, this extra layer of<br />
insulation may change the temperature profile<br />
within the wall and may increase (or possibly<br />
decrease) interstitial condensation. Deliberate<br />
consideration of the heat, air, and moisture<br />
flows are especially important with the use of<br />
insulated sheathing. A well designed rainscreen<br />
wall system minimizes these risks.<br />
Visit http://go.hw.net/AR314Course1<br />
to read more and complete the quiz<br />
for credit.<br />
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QUIZ<br />
1. From the exterior, rainscreen wall systems look very similar to conventional wall systems.<br />
a. True b. False<br />
2. What is a rainscreen wall system?<br />
a. An air gap that allows bulk water to drain between the exterior cladding and the remainder of the wall system<br />
b. A wall system that allows exterior walls to breathe to both the inside and the outside<br />
c. An air barrier that enables buildings to comply with the new energy code requirements<br />
d. A design approach that reduces bulk water penetration into exterior walls<br />
e. A specialized wall system used only in very wet climates<br />
3. What is the primary purpose of the exterior cladding in a wall system?<br />
a. Thermal barrier b. Air barrier<br />
c. Bulk water barrier d. Weather barrier<br />
e. Vapor barrier f. All of the above<br />
4. What is the primary purpose of the weather resistive barrier in a wall system?<br />
a. Thermal barrier b. Air barrier<br />
c. Bulk water barrier d. Weather barrier<br />
e. Vapor barrier f. All of the above<br />
5. What is the primary purpose of the vertical-channel air gap in a rainscreen wall system?<br />
a. Air flow b. Bulk water flow<br />
c. Water vapor flow d. All of the above<br />
e. A and C only<br />
6. What are the primary forces that drive rain (bulk water) into a building’s exterior envelope?<br />
a. Gravity b. Wind pressure<br />
c. Sun d. Indoor–outdoor temperature difference<br />
e. All of the above f. B and C only<br />
7. When should a rainscreen wall system be used?<br />
a. Buildings located in a region with large amounts of rainfall<br />
b. Buildings located in a region with high humidity<br />
c. Buildings that require a light-weight wall system<br />
d. Buildings that have durability as a primary design goal<br />
e. All of the above<br />
f. A and B only<br />
8. What is a perm?<br />
a. An acronym for “permeable and extra resistive materials”<br />
b. A unit of measure defined in ASHRAE Standard 90.1<br />
c. A test requirement in IECC 2012<br />
d. A metric used to delineate between impermeable, semi-permeable, and permeable materials<br />
e. A relative indicator of air leakage through a material<br />
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9. True or False: A rainscreen wall assembly employs interior gypsum board as the air barrier, with an air leakage<br />
rate of 0.003 cfm /sq. ft. Does this comply with ASHRAE 90.1-2010?<br />
a. True b. False<br />
10. True or False: With a rainscreen wall system, there should be no bulk water penetration behind the exterior<br />
cladding.<br />
a. True b. False<br />
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