“Wiss, Janney, Elstner Associates” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program will be

reported to AIA/CES for AIA members. Certificates of Completion

for both AIA members and non-AIA members are available upon

request.

This program is registered with AIA/CES for continuing professional

education. As such, it does not include content that may be deemed

or construed to be an approval or endorsement by the AIA of any

material of construction or any method or manner of handling,

using, distributing, or dealing in any material or product.

Questions related to specific materials, methods, and services will be

addressed at the conclusion of this presentation.

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© Wiss, Janney, Elstner Associates, Inc. 2013

Develop a basic understanding of below grade waterproofing and drainage systems, along with the integration of these systems with above grade weather barrier system(s).

1. Define below grade.

2. Define below grade waterproofing and drainage types and systems.

3. Discuss the application and design of below grade waterproofing and systems.

4. Examine typical detailing of the more common below grade systems.

“The portion of a building that is below ground level.”

Two Types of Systems

Positive Side:

Waterproofing placed subsequent to the installation of the structural wall

Waterproofing material adheres to the below grade structural wall

Negative Side or Blindside :

Waterproofing placed prior to the installation of the structural wall

Concrete typically bonds to the material during casting

Two Types of Systems

French Drain

Typically installed as part of

positive side below grade

waterproofing application

Under Slab

Typically installed as part of

blindside below grade

waterproofing application

Selection of the system is dependent on the

location and type of the structural walls

Provide continuity with the vapor barrier

(below the slab) and the wall waterproofing

system above grade

Provide protection for the membrane

Provide a drainage system to relieve hydrostatic

head pressure

Design Considerations

Waterproofing material selection

Vapor barrier selection

Insulation required? Type?

Provide drainage? Where can I drain to?

Integration with above grade wping

Basic Components

Below Grade Wping

Material

Drainage

Mat/Protection

Board

Insulation

Vapor Barrier

Drainage (maybe)

General Rules – At Grade Integration

Extend below grade waterproofing 8 “ minimum above grade,

integrate with the above grade waterproofing system

Protect the below grade waterproofing system above grade

45° Bend at

Corners

Cleanouts at 100

ft and/or every

second turn

General Rules

Perforated pipe, pre-wrapped with filter fabric installed at the bottom of the excavation

Non-perforated pipes used at cleanouts, etc.

Slope pipe 0.5% - start pipe 12” below FFE

Provide cleanouts at every 100 feet o.c. and/or every two corners

45° bends at corners

Filter fabric wrapped gravel around pipe; extent depends on depth, etc.

Provide a clay cap at landscaped areas, below top soil

Design Considerations

Waterproofing

material selection

Vapor barrier

selection

Where can I drain to?

Integration with

above grade wping

Basic Components

Below Grade Wping

Material

Drainage

Mat/Protection

Board

Vapor Barrier

Under Slab

Drainage

Note the lap

direction

Not

Recommended

Integration with

above grade wping

varies by condition

General Rules – At Grade Integration

Integrate of below grade with above grade waterproofing system –

extend below grade system 8” minimum above grade

Protect the below grade system at grade

Leakage will occur at discontinuities

Positive Side

Waterproofing

– drain pipes

to exterior

Water piped to

sumps

Drain pipes at

interior below

slab

45° at Corners

Slope pipe at

0.5%

Water piped to

sumps (not

elevator sumps)

This concludes The American Institute of Architects

Continuing Education Systems Course

Jeffrey Acton: jacton@wje.com

Thank you for your time!