MASONRY - MIT OpenCourseWare · PDF filePart I: Masonry in Architecture • Structural...
Transcript of MASONRY - MIT OpenCourseWare · PDF filePart I: Masonry in Architecture • Structural...
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Part I: Masonry in Architecture
• Structural Morphology
i. Load Bearing
ii. Non-load Bearing
Images:
Institute of Chemistry, IITMies van der Rohe, 1945
Library and Administrative Building, IITMies van der Rohe, 1944
HouseMies van der Rohe, Wall Section, 1934
MASONRYMASONRY
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Part I: Masonry in Architecture
• Structural Morphology
i. Load Bearing
ii. Non-load Bearing
MASONRYMASONRY
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Part I: Masonry in Architecture
• Structural Morphology
i. Load Bearing
ii. Non-load Bearing
MASONRYMASONRY
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Part I: Masonry in Architecture
• Structural Morphology
i. Load Bearing
ii. Non-load Bearing
Image by MIT OCW.
MASONRYMASONRY
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Part II: Masonry Systems and Architecture
• Principles of masonry construction
• Construction• Loading and deformation
Image by MIT OCW.
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Part II: Masonry Systems and Architecture
Overview• Water Penetration Resistance
– Wall Systems– Flashing and Weep holes– Coatings
• Differential Movement– Cracking– Movement Joints
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Part II: Masonry Systems and Architecture
Problems related to water penetration• Water entry into interior• Efflorescence• Spalling• Corrosion• Reduced insulating capacity• Staining / Mold / Mildew
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Keys to Providing Water Penetration Resistance
• Quality Materials
• Good Construction
• Proper detailing
• Maintenance
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Keys to Providing Water Penetration Resistance
• Quality Materials
• Good Construction
• Proper detailing
• Maintenance
SCHOOL OF ARCHITECTURE AND PLANNING: MITMASONRY DETAILING SCHOOL OF ARCHITECTURE AND PLANNING: MITMASONRY DETAILING
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Three Basic Wall Types
• Drainage Wall
• Barrier Wall
• Single Wythe Wall
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Drainage Wall
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Drainage Wall• Water travels down back side of outer wythe,
collected on flashing, and channeled to exterior through weep holes
• Examples: – Cavity walls– Masonry veneer walls– Rain screen walls
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Drainage Walls Requirements
• 2 to 4 ½ inch clear cavity
• Flashing and weep holes to channel out excessive water
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Rain Screen Wall
• Equalizes pressure within cavity• Vents at top and bottom of wall or panel• Flashing and weep holes• Compartmentalized• Allows for ventilation and evaporation
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Barrier Wall
• Collar joint between wythes acts a barrier to moisture along with the thickness of the wall
• Examples– Brick and Block
Composite Wall
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Barrier Wall
• Voids allow water penetration
• Must be filled solid with mortar or grout
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Single Wythe Walls
• Masonry units with coating or integral water repellent
• Mortar with integral water repellent
• Through-wall flashing• Weep Holes• Vents
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“A nominal four-inch wythe of
brick masonry,
no matter how well built, by whom,
or of what, never stopped
a wind driven rain.”
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Air Space Requirements
• 2” minimum to be effective
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Air Space
• Clear and free
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Flashing Details
• Locations
• Placement
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Flashing Locations
• base of wall• sills• heads of windows• at shelf angles• copings• lower wall/ higher roof intersection• other discontinuities in air space
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Good Flashing Detail
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Poor Detail
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Drip Edge
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SS Drip Edge
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