How to fit a Living Sedum Roof on your Garden Office

A new garden building is a fantastic way of creating extra space, but if you’re worried it will compromise the greenness of your garden, think about adding a living sedum roof.

A living sedum roof is an eco-friendly roof finish that not only looks great but also adds to the building's insulative properties, reduces sound transfer and creates a haven for wildlife. You can order the kit to install yourself at any time or have our team of expert installers lay the sedum while constructing your garden room.

This step-by-step guide will help you install a living sedum roof on your garden office or shed. Discover more about how eco-friendly our garden buildings are.

Green sedum living roof

Preparation

The roof construction must be completed prior to delivery of the living sedum roof to ensure installation can take place right away. Delivery from the supplier can arrive from multiple sources so sometimes, multiple deliveries will be required to fulfil the shipment.

The drainage board will be the first component needed in the installation and will be the same colour on both sides, but it is important to orient the board correctly before installation. The board has a profile similar to a store-bought box of eggs, and needs to be placed cup-side-up.

drainage board comparison

When fitting the drainage board, make sure it is cut 25mm short around the edge of the EPDM to avoid a sharp edge potentially damaging the roof membrane. Lay down the drainage board and when laying two pieces side-by-side, put the fabric underneath the board for a neat finish.

drainage board installation

Layout the Growth Medium

Growth medium, as it says on the bag is there to help support the growth of the living sedum roof. The growth medium is supplied in 25kg bags which should be spaced out evenly across the roof. Open and carefully spread the contents over the drainage board ensuring the finish is free from lumps & bumps.

growth medium installation

Make sure to cut a 200mm hole in the drainage board around the gutter outlet. Our installers find it best practice to position some pebbles around the gutter outlet to prevent debris from blocking the drainage.

stones around drainage outlet

Roll out the sedum

Now the exciting part, laying out your new eco-roof! 

When lifting the rolls of sedum, remember, that this is a living material and the turf can be fragile. A top tip from our installers is to prepare a sling with an old tarp to cradle the turf rolls whilst lifting and manoeuvring.

Once the turf is on the roof, simply roll out the sedum to cover the whole surface of the drainage board, removing a small section around the gutter outlet. The sedum will arrive in sections of approximately 1.2m x 2m. Some sections will need to be trimmed to size and can be easily cut with an old hand saw or utility knife. 

sedum roof installation

Maintenance

Immediately after installation, the plant can be a little fragile. It's a good idea to keep an eye on it, making sure it doesn't dry out as it establishes. If it's slow to establish, it may require an initial feed.

Sedum is very low maintenance and rarely requires attention. However, If you don’t have a clear view of your new roof, you should check the plant from time to time.

Periodically, you may need to:

  • Weed & remove any moss from the turf.
  • Check for wilting and water if required (usually just during a heatwave).
  • Feed the sedum every couple of years (unless the birds are already doing that for you!).

sedum green living roof

If you’re interested in our eco-roof options for your new garden building, get in touch on 01225 744566 or click here to enquire.

What our customers say...

“Efficient personable service - Fantastic job and speedy from delivery of building to finished structure - many thanks!”

Mr & Mrs Bamford, Bath

“Well everything is finished and it looks wonderful The garden room has already been used many times. Thanks again for a terrific job, we've already had a couple of people saying that they want to move in!”

Mr & Mrs Thomas, Bristol

“We would like to thank you for all your help .... in the selection, supply and build of our garden room. You were all extremely helpful & courteous, and willingly helped me with "tricks of the trade" for the construction of the base and the the self-assembly of the garden room. When I broke my finger during construction (nothing to do with building the room - waterskiing!) you stepped in at short notice to help finish the roof. We are very happy with the building, and would willingly recommend…”

Mr Langley-Johnson - Wiltshire

“Many thanks for your great service. ”

Lord Pembroke, Wilton House, Salisbury

“We are delighted with the garden room and look forward to many happy hours with the grandchildren. We were surprised at the lack of disruption to our daily lives; in short it was a pleasure to have your team here.”

Mr & Mrs Carrs, Frome, Somerset

“I would like to take this opportunity to thank you and the erection team .... for such a positive and professional experience. Our whole experience with Garden Affairs has been excellent and we rate you very highly. The studio itself is gorgeous!! Thanks again.”

Mr & Mrs Mathieson - Bridport