Living wildflower roof

[goldenshoe]

Not sure if this belongs in property or gardening, but has anyone got a living roof on their house?

I'm planning an extension and have become a bit obsessed with the idea and would love to cover a flat roof with one. I prefer the look of wildflowers but sedum appears to be the most common option.

Does anyone have any insight to do this? Was it much more costly than a regular roof, and are you glad you did it?

We put one on our wood store, much smaller area. We planted it up with sedums and saxifraga from the garden. It was soon colonised by self seeded flowers, such as Welsh poppies, herb Robert, small willow herb.
It did need a bit of judicious thinning out at times..

I would be worried about the weight myself.
Soil, particularly when wet is really heavy.

That sounds lovely @Beebumble2, I do saxifraga and the idea that things would eventually take root naturally is perfect.

@BigWolfLittleWolf that's something I'm looking at, it can be done but you need to make sure your roof is strong enough to take the extra weight. Hopefully not prohibitively expensive.

that's something I'm looking at, it can be done but you need to make sure your roof is strong enough to take the extra weight. Hopefully not prohibitively expensive
My DH is an ex roofer.
Done properly, it absolutely will be ‘prohibitively expensive’ and even then, it’s not something I would ever trust personally.
Not all roofs are suitable, only flat roofs usually.

DH actually wanted us to have one on the shed but the added weight is absolutely colossal.
We have plenty of plants growing up the walls but a green roof is not something I could ever be relaxed about having.

I have a luxuriant moss garden on my dining room roof. But not from choice...!