1. Do green roofs cool the air?
Anna Solcerova
Frans van de Ven
Mengyu Wang
Michiel Rijsdijk
Nick van de Giesen

3. 7 extensive green roofs and 2 traditional roofs (gravel and black) in Utrecht
Measured:
temperature inside the green roofs
temperature 15 and 30 cm above
soil moisture (2 roofs)
runoff
weather station: rain volume, temperature, wind, and solar radiation

4. Cooling effect in relation to soil moisture
Cloudy days
Clear sky days
Soil moisture Ts
Air temperature 15cm above roof (T15)
Two green roofs (GR4 “•” and GR7 “▼”)
White gravel roof as reference

7. Dry year vs. “normal” year
Air
temperature
30 cm above
Air
temperature
15 cm above
Soil
temperature
(-2.5 cm)

8. Conclusions Know your aim! Know what are you measuring
Know your plants
Know your aim!
Avg. diff = - 0,04OC
Avg. diff = + 0,03OC

9. Thank you! Questions?
For more details: Solcerova Anna, et al. "Do green roofs cool the air?."  Building and Environment 111 (2017):