Withstand lateral loads 2 prevent energy transfer 3

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Unformatted text preview: ay, March 18, 13 WALL SYSTEMS Monday, March 18, 13 WALL FUNDAMENTALS VISUAL + ACOUSTIC BARRIERS: MAY BE LOAD-BEARING OR NON; INTERIOR OR EXTERIOR EXTERIOR WALLS: 1. WITHSTAND LATERAL LOADS 2. PREVENT ENERGY TRANSFER 3. PREVENT MOISTURE/VAPOR MIGRATION 4. PROVIDE FIRE RESISTANCE Monday, March 18, 13 LOAD-BEARING WALLS: • COLLECT STRUCTURAL LOADS • TRANSFER LOADS TO FOUNDATIONS In winter, cool/damp air tends to move in In summer, cool/damp air tends to move out BARRIER WALLS • JOINTS MAY BE SEALED, LAPPED OR BOTH • PRIMARY DEFENSE: WEATHER • SIMPLE + EASY TO BUILD • MUST WITHSTAND GRAVITY, MOMENTUM, SURFACE TENSION, CAPILLARY ACTION, + PRESSURE DIFFERENTIALS FROM INSIDE TO OUTSIDE OUTER WALL: WATERPROOF MATERIAL + JOINTS INNER WALL: N/A drainage walls Monday, March 18, 13 DRAINAGE WALLS • HAVE A CAVITY BETWEEN WALLS WHICH ARE TIED TOGETHER • CAVITY HELPS TO EQUALIZE PRESSURE • FLASHING: IMPERVIOUS MEMBRANE ADDED AT TRANSITIONS IN ENVELOPE TO DIVERT MOISTURE FROM CAVITY (COORDINATED WITH THE WEATHER BARRIER) • WEEP HOLES: ALLOW MOISTURE TO DRAIN TO EXTERIOR OUTER WALL: NOT WATER TIGHT INNER WALL: PROVIDES SECOND SKIN Monday, March 18, 13 Flashing is an impervious membrane added at transitions in envelope to divert moisture from cavity ! Flashing must be coordinated with weather barrier Weep holes are added to allow moisture to drain to exterior ! RAIN SCREEN WALLS • HAVE A CAVITY BETWEEN INNER + OUTER WALLS OUTER WALL: POROUS WITH UNSEALED GAPS TO EQUALIZE PRESSURE INNER WALL: INSULATED + WATERPROOF BARRIER Monday, March 18, 13 DOUBLE SKIN WALLS • HAVE A CAVITY BETWEEN INNER + OUTER WALLS WHICH ARE TIED • MORE COMPLEX + EXPENSIVE UPFRONT, BUT SAVE MORE ENERGY OVER THE LIFETIME OF THE BUILDING • “INTELLIGENT FACADES”: ACTIVE SOLAR CONTROL, VENTING + HEATING • CREATED TO MAKE A MORE ENVIRONMENTALLY-STABLE CURTAIN WALL OUTER WALL: RAIN SCREEN, ACTIVE HEATING + COOLING INNER WALL: ? Monday, March 18, 13 BEARING WALLS • SERVE BOTH AS STRUCTURE AND ENCLOSURE, MUST BE CONTINUOUS TO BE EFFECTIVE • STRUCTURE: MUST BE STRONG IN C + T, EXTENSIVE FOUNDATIONS, LITTLE LATERAL STRENGTH, LOW R-VALUE • ENCLOSURE: MUST CREATE A SPACE + MAINTAIN ENVIRONMENT, SLOW TO BUILD MASONRY CONCRETE WOOD + STEEL USUALLY CMU AND REQUIRE • CAST-IN-PLACE, PRECAST, OR REINFORCING, GROUTING, TILT-UP CONSTRUCTION •LIGHT FRAME OR LIGHT GAUGE DOUBLE WIDTH OR BONDING •CAN BE EXPOSED ON BOTH • VERTICAL: REBAR THROUGH CAVITIES WHICH ARE GROUTED WEATHER BARRIER, VAPOR • HORIZONTAL: LADDER/TRUSS RETARDER MUST BE REINFORCEMENT Monday, March 18, 13 SIDES, BUT INSULATION, COORDINATED CONSTRUCTION •REGULARLY-SPACED ELEMENTS WITH SHEATHING TO CREATE PLANES •MASS-PRODUCED, LIGHT, EASY INSTALL LIGHT-FRAME COMPONENTS STUDS OR JOISTS EVENLY SPACED MEMBERS SHEATHING • EXTERIOR • STRUCTURE: CREATES DIAPHRAGM, DISTRIBUTES FORCES, PREVENTS WRACKING • BARRIER: COVERED WITH BUILDING PAPER • ATTACHMENT FOR FINISHES: FLOORING, ROOFING, SIDING, ETC. • INTERIOR • USUALLY DRYWALL SHEATHING Monday, March 18, 13 FRAMES Monday, March 18, 13 FRAME MATERIALS WOOD STEEL REINFORCED CONCRETE - HISTORICAL TRADITION - VERSATILE FRAME MATERIAL - SMALL TO MEDIUM BUILDINGS PROTECTED (CORROSION + FIRE) - MEDIUM TO LARGE BUILDINGS - RESOURCES MUST BE - MEDIUM TO LARGE BUILDINGS (SITE CAST OR PRECAST) CAREFULLY CONSIDERED Monday, March 18, 13 - IDEAL FRAME MATERIAL IF IF FIELD LABOR + SPEED ISSUES LATERAL BRACING shear diaphragms INHERENTLY S...
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This document was uploaded on 03/15/2014 for the course ARCH 242 at California State Polytechnic University.

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