- Examining the difference between below grade waterproofing and the rest of the building envelope and the unique risk factors.
- Understanding the types of products and accessory options for below grade waterproofing - including joint waterproofing.
- Discussing the advantages/disadvantages/limitations of various product options based on design parameters.
- Looking at how various construction practices affect various waterproofing options.
Prevention of moisture intrusion without a hydrostatic pressure.
"Retard water migration or vapor transmission, but not completely stop it"- Sealant Waterproofing Restoration Institute (SWRI)
"A system designed to resist hydrostatic pressure exerted in the liquid state"
-Justin Henshell (Building Envelope Consultant) and ASTM
"The treatment of a surface or structure to prevent passage of water under hydrostatic pressure" - Sealant Waterproofing & Restoration Insitute (SWRI)
- Waterproofing is expected to stay wet
- Potential for high hydraulic pressure- 62.4 lbs/ft3
- Systems are inaccessible
- Warrantied should be scrutinized
- Weather ability is an important factor primarily during construction
- Uses of space can change over time
- Materials are often different
- Details and sequences are different
- Drainage may not be an option
- Consequences of improper installation are much greater
- Potential for ground water contamination
COMMON TYPES OF WATERPROOFING
According to the Sealant, Waterproofing and Restoration Institue (SWRI) these are the main waterproofing categories:
- Hot Applied Liquid
- Cold Applied Liquid
- Thermoplastic Sheet
- Bentonite Sheet
- Bituminous Membrane
COMMON QUESTIONS IMPACTING SYSTEM SELECTION:
- Transition from below grade to above grade to roofing
- Tie Backs
- Brackish Groundwater/ Soil Contaminates
- Waterproofing system that work with Shotcrete
- Redundancy options
- Don't forget about the joints
WATERPROOFING THAT CAN SAVE TIME/MONEY
- Systems that have the lowest material cost, don't always have the lowest installed cost.
- Often low priced material systems have high labor costs.
CONSIDERATIONS REGARDING SYSTEM SELECTION
The design team can save time and often money by ensuring you have addressed:
- Wet weather considerations
- Special needs for shotcrete
- Groundwater contamination
- Transition details-sheet-to-liquid/hot rubber/ect.
- Construction joint waterstops
- Owner expectations
WATERPROOFING- INSTALLATION LOCATION
Negative Side Waterproofing
- Applied to inside of structure with water source outside.
- Used for remedial work and applications where positive side is inaccessible or cost prohibitive.
- Can be Asphaltic, Cementitious, and Chemical in nature.
- May not be 100% effective in the long term as post cracking/ cold joints can comprise performance.
Blind Side Waterproofing
- Still positive side (wet side) but pre applied with steel and concrete placed after installation.
- Requires uniform, supportive substrate
- Repairs not possible after concreting
- Vertical/ Horizontal applications...allows for "tanking of the structure"
Positive Side Waterproofing
- Applied to exterior or "wet" side of structure (where the water has also been applied)
- One of the most effective methods especially if adhered/ bonded
- Easily inspected for conformance to manufacturers guidelines and readily repaired.
- A waterproofing system much like any other component or system in construction can be damaged by subsequent trades and needs to be protected - Weather/ Trades/ UV
- System should be scrutinized for durability & ease of repair in the presence of "site operations" and weather.
- A quality pre-construction meeting can dispel a great deal of myth and bad practices. Encourage a requirement in the specifications for a pre-construction meeting with trades and manufacturers.
MATERIALS FOR SYSTEM PROTECTION
- Insulation Board
- Drainage Panel
- Concrete Slabs
EXPAND YOUR KNOWLEDGE
ABOUT THE PRESENTER
Craig Haley obtained his Bachelors of Science degree from the University of Missouri – Science & Technology in Civil Engineering. Prior to joining Sika, Craig worked as Project Engineer for Jacobs Sverdrup Corporation on various Superfund site clean-up projects and water treatment projects across the country.
After joining Sika in 1998, Craig provided Technical Sales for Division 3 Waterproofing Joints. Upon relocation to Southern California in 2000, he was promoted to the role of Territory Manager for the West Coast.
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