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 Interior Finishes  Corrosion of Metal Studs & Anchors  Wood Rot  Freeze/Thaw Deterioration  Loss of Insulating Value  Electrical Danger

CREATIVE LEAK MANAGEMENT

BASIC WALL TYPES  CAVITY  BARRIER

BARRIER WALLS TRADITIONAL Absorbs and evaporates moisture slowly  Mass Masonry  Pyramids  Churches  Philadelphia City Hall

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

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)

DAMAGE & DETERIORATION

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

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

TYPICAL FLASHING DETAILS

TYPICAL FLASHING DETAILS

HEALTHCARE FACILITY CONDITIONS 1978 1962 1922

EXAMPLE – PHASE I CAVITY WALL BASEMENT

ABOVE GRADE SUB-GRADE Warranty Expectations?

ABOVE GRADE SUB-GRADE

EXAMPLE – PHASE II CAVITY WALL CAVITY WALL BASEMENT

CAVITY WALL BARRIER WALL ORIGINAL BLDG. ADDITION ROOF

CAVITY WALL BARRIER WALL  INCORRECT

CAVITY WALL BARRIER WALL  CORRECT

EXAMPLE – PHASE III CAVITY WALL CAVITY WALL CURTAINWALL BASEMENT

CAVITY WALL CURTAINWALL

CAVITY WALL CURTAINWALL

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!

QUESTIONS