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Joseph B. Callaghan, Inc.
HEALTHCARE FACILITIES Joseph B. Callaghan, Inc. THE 1/90% PRINCIPLE - - PowerPoint PPT Presentation
HEALTHCARE FACILITIES Joseph B. Callaghan, Inc. THE 1/90% PRINCIPLE - - PowerPoint PPT Presentation
WATERPROOFING YOUR HEALTHCARE FACILITIES Joseph B. Callaghan, Inc. THE 1/90% PRINCIPLE As much as 90% of all water intrusion problems occur within 1% of the total building exterior surface area. CONSEQUENCES OF LEAKAGE Damage to
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CONSEQUENCES OF LEAKAGE
Damage to Interior Finishes Corrosion of Metal Studs & Anchors Wood Rot Freeze/Thaw Deterioration Loss of Insulating Value Electrical Danger
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CREATIVE LEAK MANAGEMENT
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BASIC WALL TYPES
BARRIER CAVITY
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BARRIER WALLS
TRADITIONAL Absorbs and evaporates moisture slowly
Mass Masonry
- Pyramids
- Churches
- Philadelphia City Hall
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BARRIER WALLS
CONTEMPORARY Impermeable cladding materials and permanently sealed joints
Precast Panel – Seashore House EIFS – Moss Rehab Curtainwall – 1 & 2 Liberty Stone Panel – 4 Penn
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BARRIER WALL LIMITATIONS
Cladding materials are
not impermeable and rarely uncracked
– Includes: masonry, concrete, EIFS
External joint sealants
alone are not very reliable or durable
– Urethane (7-10 yrs) – Silicone (15-20 yrs)
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DAMAGE & DETERIORATION
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CAVITY WALLS
Two wythes of masonry
separated by an air cavity and tied together
Cavity may or may not
contain insulation
Moisture may penetrate
the outer masonry, but cannot travel across a void
Flashing allows water in the
cavity to exit
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CAVITY WALL DESIGN CONSIDERATIONS
Material selection Mortar quality & joint type Flashing design & detailing
– Specify flashing service life equal to building life
- Additional cost during construction = $3-10/LF
- If repaired after construction, cost = $125/LF
– Install end dams when needed
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TYPICAL FLASHING DETAILS
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TYPICAL FLASHING DETAILS
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HEALTHCARE FACILITY CONDITIONS
1922 1962 1978
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EXAMPLE – PHASE I
CAVITY WALL BASEMENT
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ABOVE GRADE SUB-GRADE
Warranty Expectations?
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ABOVE GRADE SUB-GRADE
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EXAMPLE – PHASE II
CAVITY WALL BASEMENT CAVITY WALL
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CAVITY WALL BARRIER WALL
ADDITION ROOF ORIGINAL BLDG.
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CAVITY WALL BARRIER WALL
INCORRECT
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CAVITY WALL BARRIER WALL
CORRECT
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EXAMPLE – PHASE III
CAVITY WALL BASEMENT CAVITY WALL CURTAINWALL
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CAVITY WALL CURTAINWALL
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CAVITY WALL CURTAINWALL
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SUMMARY
WHEN DESIGNING ADDITIONS:
– Understand exterior wall types and how they interact – Make sure design professional understands them – Specify waterproofing material to match expected building life – Warranty expectations Know them!
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