1. Green Roof Design and
Construction an introduction
California Center for Sustainable Energy
September 15, 2009
Robert Thiele, Architect A.I.A. LEED AP
Wednesday, September 9, 2009
2. living
water
collecting
peddles
water
storage
succulent
chalk dudleya
Arid Climate Nature
Wednesday, September 9, 2009
4. The Living Building
Harvest all its own energy and water
Adapted to climate and site
Operates pollution free
Promotes health and well-being
Comprised of Integrated Systems
Is Beautiful
Wednesday, September 9, 2009
5. James Hubbell
my school of the organics 1971
Wednesday, September 9, 2009
6. 2003
Paolo Soleri 1973
solar architecture
Arcosanti
Cortez Junction,
Arizona
arc-ology
architecture and ecology 1973
Wednesday, September 9, 2009
7. Cristo
Umbrellas Project
1991
Wednesday, September 9, 2009
8. my first commission
large overhangs for sun and rain
1978
Wednesday, September 9, 2009
9. GREEN ROOFS
styles change
Wednesday, September 9, 2009
10. Green Roofs embody the spirit of
green building
Wednesday, September 9, 2009
19. Green Roofs: Beautiful and Innovative
Solutions to Stormwater Pollution
A green roof is a contained green space
on top of a human-made structure
below, above or at grade.
Wednesday, September 9, 2009
20. Green Roofs
on homes and
Bio-swales in
median,
parkways and
landscaped
areas could
filter storm
ASBS water and
Area of Special Biological
reduce
Significance pollution
La Jolla Marine Reserve
Wednesday, September 9, 2009
24. Green Roofs
Academy of Science, San Francisco
Wednesday, September 9, 2009
25. Green Roofs Los Angeles
Green Roofs - Cooling Los Angeles
A Resource Guide
Environmental Affairs Department
City of Los Angeles
200 N. Spring Street., Suite 2005
Los Angeles, CA 90012
Wednesday, September 9, 2009
26. Green Roofs in San Diego
Permit Process
Alternate Means and Methods
2008
Wednesday, September 9, 2009
29. ASTM Standards
Green Roof Systems
E 2396 Standard Practice Saturated Water Permeability of
Granular Drainage Media
* E 2397 Standard Practice for Determination of Deed Loads
and Live Loads
E 2398 Standard Test Method for Water Capture and Media
Retention or Geocomposite Drain Layers
* E 2399 Maximum Media Density for Dead Load Analysis
* E 2400 Selection, Installation and Maintenance
Wednesday, September 9, 2009
30. Building Codes
Non-Occupied Green Roofs Occupied Green Roofs
Section 1607.11.2.3 Section 1004.1.1
Landscaped Roofs Occupancy Loading
Table
Section 1611A Section 1009.11.1
Rain Loads Stairways & Roof
Access
Wednesday, September 9, 2009
31. Building Permits for
Green Roofs
are
Required
Life Safety Issues
Structural Issues
Wednesday, September 9, 2009
33. Superlite Green Roof
Non-occupied 3” extensive roof
Live Loads snow, rain, wind, people, maintenance, machinery
maintenance worker 20 psf
Dead Loads
green roof assembly 20 psf
roof framing assembly 14 psf
Total Dead & Live Loads 54 psf
Green Roof Design Construction
Wednesday, September 9, 2009
34. Superlite Green Roof
Residential occupied extensive roof
Live Loads
residential deck 40 psf
Dead Loads
3” green roof assembly 20 psf
stepping stones 6 psf
roof framing assembly 14 psf
Total Dead & Live Loads 80 psf
Green Roof Design Construction
Wednesday, September 9, 2009
35. Superlite Green Roof
Commercial occupied extensive roof
Live Loads
commercial deck 60 psf
Dead Loads
3” green roof assembly 20 psf
stepping stones 6 psf
roof framing assembly 14 psf
Total Dead & Live Loads 80 psf
Green Roof Design Construction
Wednesday, September 9, 2009
36. First Order of Design Decisions
Determine Type of Green Roof
Extensive, Semi-Intensive or Intensive
Degree of Accessibility
Non Occupied or Occupied
Determine Size of Occupancy
Influences cost
Wednesday, September 9, 2009
38. 1. Is this an extensive or an intensive green roof?
Benefits Benefits
looks good plus
grows food
low water plants
saves energy grows larger plants
collects storm water
shallow deep
2”- 6” deep 6” and deeper
Extensive Intensive
Green Roof Design Construction
Wednesday, September 9, 2009
39. 2. occupied or non-occupied green roof?
access
plan view plan view
42” high guardrail required
maintenance workers
stair access ladder access
fall protection provided fall protection training required
OCCUPIED ROOF NON-OCCUPIED ROOF
Green Roof Design Construction
Wednesday, September 9, 2009
40. 3. Can the structure support the loads ?
20 psf Landscaped Roof Live Loads
20.38 psf 3” Ultra Extensive Green Roof System Dead and Live Loads
13.85 psf Roof Membrane & Structure Dead Loads
No Occupancy
roof 54.23 psf
54.23 psf dead and live load
sheer seismic
vertical loads lateral loads
Green Roof Design Construction
Wednesday, September 9, 2009
41. 4. Structural Retrofit
No Occupancy
sheer seismic
vertical loads lateral loads
Green Roof Design Construction
Wednesday, September 9, 2009
42. The possibilities ?
0 in 12 slope to 7 degrees
water retention barrels
Elevation
Flat Roofs
Class A Roof under
Section
Green Roof Design Construction
Wednesday, September 9, 2009
43. 1.5 in 12 slope 7 degrees
water retention barrels
Low Sloped Elevation
Roofs
1.5 in 12 slope 7 degrees
Truss
Class A Roof under
Section
Green Roof Design Construction
Wednesday, September 9, 2009
44. vegetated 4 in 12 slope
water retention barrels
Elevation
Sloped
Roof geo-tech fabric
Truss
Class A Roof under
Section
Green Roof Design Construction
Wednesday, September 9, 2009
45. Typical structural failures
Hire a structural engineer, don’t
guess
drainage failure ponding
lateral support failure
Structural Collapse
Green Roof Design Construction
Wednesday, September 9, 2009
46. Roof Drainage
Ponding in heavy rainfall is the concern
Minimum slope = 1/4” / ft or 2% to drain roof plan
ponding
Roof Drains and Secondary Roof Overflows
Rain Water Loads if Drain Clogs blocked roof drain
R = 5.2 (ds + dh)
roof drainage
Secondary Overflow
water retention barrels
elevation
Green Roof Design Construction
Wednesday, September 9, 2009
47. Drainage and overflow
Green Roof Design Construction
Wednesday, September 9, 2009
48. Safety - Fall Protection
CAL-OSHA Section 1926.501 Duty to Have Fall Protection >15’ high
Section 1926.503 Fall Protection Training Required
plan view
You are required to
have Fall Protection
maintenance workers
Training and
ladder access insurance for
all maintenance
fall protection training required workers
NON-OCCUPIED ROOF
Green Roof Design Construction
Wednesday, September 9, 2009
49. Safety - Fall Protection
access
plan view
42” high guardrail required
stair access
fall protection provided
OCCUPIED ROOF
Green Roof Design Construction
Wednesday, September 9, 2009
50. Fire Protection
“Class A” UL rating maintained
Determine fire risk zone
City or County of San Diego
SPRI
Single Ply Roofing Industry
Fire Design Standards for Green Roofs elevation
18”
18” - 36” non vegetated boundary
succulent plant pallet
( avoid grasses )
irrigation
plan
Green Roof Design and Construction
Wednesday, September 9, 2009
51. Fire Protection
drought tolerant sedum irrigation system 18” non vegetated boundary
Class “A” roof assembly
Green Roof Design and Construction
Wednesday, September 9, 2009
52. Maintenance Manual
Operations Plan
plan view
Fall Protection Plan
maintenance workers
ladder access
Fall Protection Training fall protection training required
NON-OCCUPIED ROOF
Green Roof Design Construction
Wednesday, September 9, 2009
53. GREEN ROOF
CONSTRUCTION
CASE STUDY
Wednesday, September 9, 2009
54. Re-roof - maintain existing 1 hr Class Roof A
Green Roof Construction 101
Wednesday, September 9, 2009
55. TPO membrane 60 mil
Green Roof Construction 101
Wednesday, September 9, 2009
56. CCW MiraDRAIN GR9200 drainage board (black)
CCW 200 moisture retention mat (gray)
Wednesday, September 9, 2009
