Valentina,I recently built a small Load bearing SB building with a green roof. This building has been built according to Dutch building regulations which are quite strict. There are no specific SB codes here so I had to give extra information to support the building permit. All in all though I had no trouble and the building functions very well partly due to the green roof.
Depending on the size of the building a green roof might be too much for a purely LB SB wall although it does mean the house is quite big. A rough approach is to find out how much roof is area supported per ft/m SB wall. Based on the most conservative code for loading of a SB wall, the maximum allowable combined load is 10kN/m (giving a 2.81 safety factor) This means if you have a total roof span of 10m the maximum allowable weight of of the roof structure and loads is 2kN/m^2 (10/(10/2) This is because the wall only has to bear the half span.
The green roof system applied in the small building accounted for a dead load of 0.8 kN/m^2
On May 27, 2005, at 07:36, strawbale-request@amper....muni.cz wrote:
Hi all! i guess that there are some "nebraska" houses with green=20 roof....built.... i'm planning one....i have to pass all law certification process...i=20found and look at some test of loads that straw bale can carry....and=20it's seems that is not a good idea to have a green roof.... anybody had already experience with it? thank you to all....a great list.. all the best, valentina
Rene