LEARNING OBJECTIVES
  • 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.
What is Dampproofing?

Prevention of moisture intrusion without a hydrostatic pressure.

"Retard water migration or vapor transmission, but not completely stop it"- Sealant Waterproofing Restoration Institute (SWRI)

Posted on: 07/25/2019
What is Waterproofing?

"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)

Posted on: 07/25/2019
Why is Waterproofing Different?
  • Waterproofing is expected to stay wet
  • Potential for high hydraulic pressure- 62.4 lbs/ft
  • 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
Posted on: 07/25/2019

COMMON TYPES OF WATERPROOFING

dam

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
  • Cementitious
  • Intergral
  • Asphalt

SYSTEM SELECTION

tunnel
COMMON QUESTIONS IMPACTING SYSTEM SELECTION:
  • Detailing
  • 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.

SYSTEM PROTECTION

water
  • 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

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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