Can I install Tiles or Slabs onto an EPDM rubber roof?

It is important before you consider applying concrete slabs or ceramic and decorative tiles to check how much weight your roof can withstand. When working out the weight of using these products over your EPDM rubber membrane, you must allow for not only the weight of the slabs or tiles, but also the weight of the materials required to install the products (e.g screed). 

Option 1: Concrete Slabs

If you would like to install concrete slabs over your EPDM rubber membrane, you must use paving slab supports underneath the concrete slabs. The slab supports must be 15mm high circular plastic discs that support the corners of 4 slabs. When installing the slab supports, ensure they are installed in a standard checkerboard pattern. It is important to bear in mind that water will pass through the gaps in slabs, so always ensure that sufficient trims are installed around the perimeter of the roof so that the water can run into the gutter. 

Option 2: Ceramic Or Decorative Tiles 

If you would like to install ceramic or decorative tiles, you must first install a fleeced underlay over the EPDM rubber membrane to ensure that it is protected from any sharp objects. 

Some EPDM rubber membranes such as Resitrix and ClassicBond Pro already have fleeced underlay incorporated within the membrane. If you have decided to use a rubber membrane that already has fleeced underlay within the membrane, there is no need to install more once the membrane has been installed.

Apply a layer of cement screed on top of your fleeced underlay (or fleeced underlay rubber membrane), ensuring that the screed is a minimum of 70mm thick. Once the screed is fully set you can then install and grout your ceramic or decorative tiles straight over the screed.