Sedum on a SIP roof? and which EPDM?

[Tooled up]

Hello guys,

 

Building a SIP garden room from a kit. 
Having a slightly angled flat roof and we would like a sedum roof on the SIP panel roof.

Thoughts?  Weight?

 

And can I use a typical EPDM for that?

 

Be great to hear what you think?

 

Cheers

[tonyshouse]

Oversized joists at 300mm c/c 28mm wdp ply, fail safe low edge detail, drainage layer on top of torch on felt poor soil, sedum plugs 

 

water first year and if very dry second year 

 

my one still there on someone else’s house 30 years later , fall was 12 degrees though 

[mvincentd]

roofchart.pdf

[saveasteading]

The calculation of carbon used as extra wood, as against any benefit from the sedum would be interesting.

Also allow for plastic trays, if any, and special underlay. 

 

If you want the sedum for appearance then fair enough.

[Tooled up]

thanks for the replies so far....

 

My roof panels are SIP so no joists (other than the timbers within/joining the SIP)

 

So I guess I should speak to the supplier about load capability...

 

.

[saveasteading]

32 minutes ago, Tooled up said:

load capability...

When last I used it (reluctantly) it added 30kg/m2 to the roof, but that varies and can be up to 80kg which is a lot (allow for saturated earth).

 

Please let us know how you get on.

[tonyshouse]

I can see sips sagging, even breaking ?

[Gordo]

I don’t see this as a wise change mid build. Flat roof is probably designed for a dead load of about 0.5 Kn/m2 dead load and you are thinking of adding an extra say 0.6 - 2 Kn /m2 ( probably closer to 1 Kn/m2 in my estimation for thin 75mm deep soil for sedums). Sorry but there is no way it was over engineered that much. You gonna have to do a lot of reinforcing works. Possible but costly so depends how big your pockets are for a whim 

 

here’s a guide on subject.

 

I have a green roof on my log shed and I do love it but was done on cheap (because of what it is) but needs designed for at start.

 

Edited December 2, 2021 by Gordo

[Russell griffiths]

Nope, don’t do it.