Waterproofing

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Roof Garden
Waterproofing System
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Roof Garden Todays Advantages

• Reduces urban heat island effects
• Storm water runoff management
• Adds valuable/useable space providing economic
  benefits
• Energy efficiency year-round
• Could earn LEED points

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Roof Gardens
Kaiser Resources Vancouver, BC After
Before
Create high value, usable space
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Roof Gardens
Rockefeller Center 1933
Enhances view from neighboring buildings
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Roof Garden - Design Principles
For Effective Waterproofing Systems

• Select highly puncture resistant membrane
• Establish redundancy Splice overlayment
• Provide positive drainage at membrane level

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Roof Garden - Design Principles

• Ensure proper system protection
• Incorporate drainage layer/root barrier
• Utilize Moisture Retention Mat (where applicable)

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Roof Garden Assembly Types

• Ultra-Extensive/Shallow lt 4 deep
• Extensive/Medium 4 - 8 deep
• Intensive/Deep gt 8 deep

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Shallow Assembly

• ? Growth Media
• Moisture Retention Mat
• Drainage Board
• Protection Fabric
• Membrane ( Adhered )
• ? Dens-Deck
• Approved Insulation
• ? Substrate

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Ultra-Extensive/Shallow Assembly
Growth Media Sedum
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Ultra-Extensive/Shallow Assembly
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Medium Assembly

• ? Growth Media
• Moisture Retention Mat
• Drainage Board
• Root Barrier
• ? Protection Fabric
• ? Membrane ( Adhered )
• ? Dens-Deck
• ? Approved Insulation
• ? Substrate

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Roof Garden Medium Assembly
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Deep Assembly

• ? Growth Media
• ? Protection Fabric
• ? Drainage Gravel
• Protection Fabric
• Root Barrier
• Extruded Polystyrene
• ? Membrane ( Adhered )
• ? Dens-Deck
• ? Approved Insulation

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Intensive Assembly/Deep
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Protection/Drainage Components
In addition to the waterproofing material, other
components must be utilized to ensure proper
function

• Protection Fabric
• Drainage Boards
• Moisture Retention Mat
• Extruded Polystyrene Insulation
• Root Barrier

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Planting Media

• Planting media should meet the following
  criteria
• Not include silt that can clog drainage fabric
• Provide permanent aeration
• Provide adequate drainage
• Supply or absorb water and nutrients
• Retain its original volume

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Planting Media

• Planting Media Mix
• A mix suitable for most roof garden applications
  should be similar in content and percentage or
  composed of
• 45 graded sand ( with no fines )
• 45 expanded shale
• 10 humus ( pine bark )

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Weights of Plant Media lbs/ft3
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Roof Garden
Waterproofing System