Description:
This green roof was built was bult on the outside toilet at New Roots - Glossop Road, Sheffield.

Elements:

Frame made of tanilised timber -£18

Waterproof layer - Pond liner 3mm from B&Q £21

This was laid on the roof so that it hung over all the edges. The pond liner also acts as a root barrier.

Moisture Mat -Carpet 10mm (found in a skip)

Carpet was used as it will insulate & retain moisture during wet periods and release water during dry spells.

Drainage Layer- Floradrain & gravel 50mm (Gravel £4)

We used Floradrain, an egg box style plastic sheeting. It came in strips which were cut to length and overlapped by about 5cm. This was then filled with 10mm gravel.

Filter Membrane 2mm

This material came with the floradrain and is used to stop any debris blocking up the drainage and it protects the pond liner from any mechanical damage.

It came in strips so was cut to length and overlapped by about 10cm. It was laid up and over the frame.

Soil 50-100mm

Sedum Mats

Once all of the layers were put on (except the soil) the frame edges were capped with strips of tanilised timber (1"wide, ½" thick).

Excess pond liner and filter membrane were trimmed off with scissors and neatened with a stanley knife.

Location:
Glossop Road, Sheffield