Cath Brown wrote:Beautiful building!
I have used sedum on 2 buildings now with great success.
You can get it in the the form of plugs, a blanket roll, or ready planted in interlocking modular trays with reservoirs in the bottom, to store excess water, which the plants can then use in a dry period.
The last is the most expensive system, but seems to work really well for me in the UK.
For sedum, the substrate should be very low in nutrients...it needs very little to survive, as it is a mountain plant that grows naturally on barren rocks and in crevasses. A mix of perlite and very little soil is best. I weed it once a year, and spray it with a hose pipe only after about 2 weeks of drought. Lovely flowers all summer.
As other viewers have said.... you need to check that the roof structure can bear the weight! I'm strong, but can barely lift a tray when it's throughly soaked.
Karla Jaeger wrote:We are in a similar climate, with droughty summers, wet all other times of the year, zone 7b. We have a green roof that is stunning fall-spring, and pretty crispy in summer, BUT we have a lot of seedums/succulents on it and they always look good. I really recommend those types of plants. When my partner made the roof, he started with cut sod which I think would have the benefit of reducing soil erosion while it gets established. The roof has gone through phases since then and ended up a mixture of moss, grass, wildflowers, random weeds and succulents. Everything but the succulents die off in summer (they are dead now) but they either reseed, or the roots survive until the rains come. When we go up on the roof, we will often propagate the succulents around (as easy as pulling pieces off and poking them in holes) and try to slowly get better coverage, especially on the south facing slope where it is driest. I'll post a couple pics of our roof tomorrow if I remember :)
Charli Wilson wrote:I just wanted to say what a beautiful building!
Gerry Parent wrote:Hi Marta, From my experience, I've almost always had the edges dry first and work its way towards the center. It seems to me that the water is able to wick/dry away faster contacting with either air or another dry material (against a wall or form) than in the middle where up or down is its only path to dry from. Unless you made the mixture slightly different (more wet or different ratios) I'd give it more time to dry. Of course a fan or an open window providing cross ventilation would help considerably. Good luck!