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Roof Garden. Waterproofing System . Roof Garden – Today’s 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. Roof Gardens. Kaiser Resources
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Roof Garden Waterproofing System
Roof Garden – Today’s 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
Roof Gardens Kaiser Resources Vancouver, BC After Before Create high value, usable space
Roof Gardens • Rockefeller Center – 1933 Enhances view from neighboring buildings
Roof Garden - Design Principles For Effective Waterproofing Systems: • Select highly puncture resistant membrane • Establishredundancy – Splice overlayment • Provide positive drainage at membrane level
Roof Garden - Design Principles • Ensure proper system protection • Incorporate drainage layer/root barrier • UtilizeMoisture Retention Mat (where applicable)
Roof Garden Assembly Types • Ultra-Extensive/Shallow– < 4” deep • Extensive/Medium– 4” - 8” deep • Intensive/Deep – > 8” deep
Shallow Assembly • Growth Media • Moisture Retention Mat • Drainage Board • Protection Fabric • Membrane ( Adhered ) Dens-Deck • Approved Insulation Substrate
Ultra-Extensive/Shallow Assembly Growth Media – “Sedum”
Medium Assembly • Growth Media • Moisture Retention Mat • Drainage Board • Root Barrier Protection Fabric Membrane ( Adhered ) Dens-Deck Approved Insulation Substrate
Deep Assembly • Growth Media Protection Fabric Drainage Gravel • Protection Fabric • Root Barrier • Extruded Polystyrene Membrane ( Adhered ) Dens-Deck Approved Insulation
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
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
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 )
Weights of Plant Media lbs/ft3
Roof Garden Waterproofing System