A Guide to Rooftop Sedum

Rooftop sedum is the name for the plants and wildlife that can be installed on top of roofs. Sedum is the name of the living elements but this type of roofing system is commonly known as a green roof. Green roofs refer to a roof made up of a blanket of rooftop sedum which grows and flourishes to provide a real and natural habitat for plants, animals and wildlife. These bio-diverse rooftop installations offer a home to wildlife and a good-looking, natural view for those lucky enough to be in office space or residences that overlook these.

Wallbarn and SkyGarden are two big manufacturers of rooftop sedum systems. Wallbarn’s system is modular so you purchase certain sized trays and all the smaller pieces you need to make up an entire interlocking system of sedum roof. SkyGarden comes as a blanket system in full kits in a selection of area sizes. In many cases, manufacturers offer pre-grown sedum that’s ready to go so when it’s installed you don’t have to wait for any foliage to grow – you get an instant green roof!

Table of Contents

1. Can you install rooftop sedum on any roof?

2. Does a green roof require maintenance?

3. Can you walk on a sedum roof?

4. How much does a sedum roof cost?

5. A summary of the benefits of a green roof


Can you install rooftop sedum on any roof?

You can install a sedum rooftop green roof on any roof pitch from entirely flat to entirely vertical. Of course, with vertical green ‘roofs’ climbing up walls, you must be sure it’s fixed into place and consider that sedum plants and flowers will shed leaves and petals.

Green roofs aren’t just for commercial buildings like schools and offices. Many domestic residences are choosing green roofs to improve their quality of life and bring some of nature closer to their homes. Private projects are becoming more and more common as the benefits of green roofs become more apparent and cities become denser.

Roofs that are going to have any kind of rooftop green roof system installed on to them should be waterproofed already, but it’s always worth inspecting this as part of maintenance before the green roof is laid. You’ll only have to take it up again otherwise! A rooftop sedum system contributes to the life of a roof as the sedum soaks up water and uses it to survive.

It’s advisable that if your building is older, or perhaps other structural work has been carried out like adding a roof light or lantern, that you get a structural survey. This is down to the fact that installing a green roof will add weight to the roof. It’s usually around 100kg per m2 so it’s prudent to tell an expert what your plan is so there’s no trouble further down the line.

Learn how to install a modular green roof here. 


Does a green roof require maintenance?

Sedum is drought-resistant vegetation, so it doesn’t need to be watered. There is some regular maintenance that would apply to any roof though such as inspecting and cleaning gutters, and there is some maintenance that wouldn’t apply to standard roofs! For example, it’s advised that occasional weeding is undertaken to get rid of any unwanted species that disperse and seed themselves.

It’s advised that within the first few months of install of a sedum roof that it’s saturated everyday. This can be done manually if you have access to the green roof or it’s most commonly undertaken using an irrigation system.


Can you walk on a sedum roof?

You can walk on a sedum roof for maintenance on occasion and to do less common tasks like retrieve something dropped out of a window but it’s generally not advised that you walk on a sedum roof often. A green roof is designed to flourish its own eco-system and habitat so humans walking across this will disturb it, squash plants and scare off wildlife. Not to mention, the roof it’s installed on may be safe for the load of the green roof and a few people, but as a thoroughfare or an area for staff members to sit and eat lunch, it’s not safe.


How much does a sedum roof cost?

Sedum roofs are priced per m2 as all roofs are so this is dependent on which manufacturer you want to go with and whether you pay for regular maintenance for the aforementioned items. Installation by a professional is a must for a sedum roof, and recent health and safety legislation has stated that at least two people must be present during the installation regardless of size.

Other variable factors include if you need to install an irrigation system because you don’t have access to the roof to water it when it’s first installed, if you have a lot of detailing in the roof like parapets and chimney stacks, and whether you want the sedum pre-grown or not. If you want sedum already grown so the green roof is truly ‘green’ when installed, this will cost more per m2 than if you opt for a system where the sedum is planted but not flowered yet.

Below is a table to give the cost of a SkyGarden green roof system kit that contains the surface finish, the substrate, the filter fleece, the drainage and retention layer and the protection fleece.

Green roof size and type Estimated cost
50m2 Kit (no pre-grown wildlife) £2,409.42 ex VAT
50m2 Kit (pre-grown wildflower) £2,700.59 ex VAT
100m2 Kit (no pre-grown wildlife) £3,791.80 ex VAT
100m2 Kit (pre-grown wildflower) £4,417.65 ex VAT

 


A summary of the benefits of a green roof

    • Improves roof drainage and uses recycles rainwater
    • Improves energy efficiency by insulating roofs
    • Reduces the affect of UV rays on the roof, increasing life span
    • Improves air and water quality in the area
    • Reduces noise transfer by up to 8 decibels
    • Adds more green space to dense, concrete cities

For more information on green roofs and their benefit, contact our customer service advisors on 01752 692 760 or use or live chat to speak with us at your convenience. 

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