Green Roof

[joelperez]

HI, I'm analyzing a concrete slab with a green roof and I want to know if there is a normative that covers this kind of design loads.

Thanks in advance.

 

[spieng89]

ASCE ch4 covers minimum loading associated with green roofs, that's a starting point

 

[r13]

It should be given to you by the architect, or the owner.

 

[phamENG]

By "normative" I'm assuming you mean building code. In the US, we use ASCE 7 (latest is 2016, though several US jurisdictions still rely on 2010). That would give you a minimum to design for. r13 is correct in that you should look at the actual details to determine actual loading. Don't forget that whatever soil they have up there will, at some point, be completely saturated.

 

[To Madeira]

For dead loads, there are green roof systems such as rooflite that I normally see specified by the arch/L.A. that have loads for saturated soil in their literature, it all depends on the depth of soil and ranges from 50-90psf. Don't forget to include allowance for membrane, rigid insulation for slopes, ceilings, MEP etc. if any of these apply to your condition.

For live loads, you need to establish whether the roof will only be accessed for occasional maintenance and the green roof is there for LEED certification or some other box which needs to be ticked - that case, 20psf roof live would apply. Otherwise, it would be classified as a roof garden and 100psf live load would apply. Also, check snow load.

This all assumes you're working to ASCE.

 

[KootK]

I'll hand off what I can without going to Eng-Prison:

SEAOC: Structural Implications of Green Roofs, Terraces, and Walls

Toronto Green Roof Construction Standard

Minnesota Urban Small Sites BMP Manual

Magnusson Klemencic: Green Roofs

You could have found all of this yourself via Google if you knew the right search terms to use.