Zurn is proud to introduce its green roofing drain product line specifically suited for the unique needs of a green roof installation.
Green shed roof drainage.
Older green roofs often used a permeable layer of rock aggregate such as scoria or gravel for drainage.
Cut a piece of weed matting large enough to cover the roof and the inside of the frame.
The drainage layer has an important role to play in the total system structure of a green roof.
The design of the different drainage layers allows for a portion of the stormwater to be retained above where the water is allowed to flow freely off of the roof.
Pour a layer of gravel into the frame 2 3cm deep.
Make sure that the roof has a pitch that will enable drainage.
The rock aggregate should also have a suitable ph and be low in soluble salts to ensure plant growth is not adversely affected.
Make sure that the shed roof is fully waterproof.
Step 3 allow for drainage.
This improves the drainage of the green roof which helps reduce soil erosion and aerate plants.
This roof was towards the shallow end of the spectrum and could perhaps have been a bit steeper.
The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall.
When saturated these layers can weigh in at more than 100kg per square metre or 20lbs per square foot.
Whereas too steep means that the growing medium slides down the roof.
Step 4 build a retaining frame.
The slope of a green shed roof needs to be a balance between being too steep or too shallow.
Step 2 waterproof the shed.
The drainage also contributes to good aeration of the plant roots.
Having proper drainage on a green roof is a critical aspect of the system.
During a dry period the water stored can be reabsorbed by the vegetation layer above.
A shallow roof pitch wont allow water to drain away.
Green roofs can range from roof gardens with raised beds and pots to rolled out green carpets to shed roofs containing planting cells that are filled with soil or compost and planted up with low growing perennials and grasses.
It buffers water and allows excess water to drain away.
Green roof solutions offers many different drainage layer options depending on system goals regarding water retention.
If the pitch is more than 20 degrees from horizontal you will need to take precautions so the soil in your garden does not slip.
