Enough to support the roof build up which comprised.
Green roof system for shed.
Alternatively you can reinforce and brace the internal shed structure and roofing joists before fitting.
Green roof installation guide.
And also so you can find out what works for you.
You will also need to make sure that your shed s roof is waterproof.
For this shed i used 3x2 softwood timbers at 600mm 2 ctrs which spanned 1 2m 4 with an 18mm 3 4 plywood deck.
For plants to flourish on a green roof they will need moisture and drainage which means soil and a sturdy framework to keep it in place.
When fitting a green roof to a shed make sure that your shed roof can take the increased weight load from a green roof.
Building a green roof on your shed is a way to add interest to the shed and produce a new area to cultivate.
For a green roof installation that pitch should be at least inch per foot of run.
There are some things you need to check before building but the job is not very difficult.
Step 1 check if it is load bearing.
Before the plants go up a structural engineer should check to ensure that the roof can support the weight of the engineered growing medium and plants.
When saturated these layers can weigh in at more than 100kg per square metre or 20lbs per square foot.
Check that your shed is strong enough to take such weight and remember that the walls will also play a large part in bearing the load.
Even a flat roof should have some pitch so that it sheds water toward gutters.