Support Base


Support Base for Air Conditioners, Patios, Etc.
Some owners, and even some so-called professionals, have been very generous to us as roofers by creating a lot of work. When it comes to installing a heat pump, patio or any other item on your membrane, you should know that, ideally, NOTHING should be installed directly on the membrane.


Wooden structure for an ad installed directly on the membrane with weights (cement block)

Wooden structure and heat pump installed directly on wood, which then rotted

Heat pump installed directly on wood that rotted (photograph to the right).


Patio whose structure was built directly on top of the membrane.


There must be a “buffer” zone between any item installed on a roof and the membrane, so that the weight of the item is cushioned, preventing the gravel from perforating the membrane or the item simply breaking through the existing membrane.
There are several materials that can be used as membranes, including rubberized carpets, etc. For us, the ideal solution is even more simple: extruded polystyrene, commonly called Styrofoam, because it is solid enough to support the weight but is not too rigid, which means that the gravel will penetrate the Styrofoam rather than the membrane (see photographs below).


Properly installed patio, but unfortunately the membrane is in very poor condition (photograph to the left).

Patio on a membrane in poor condition – Proper installation with Styrofoam between the membrane and the support base

Above (photograph to the right) proper installation with Styrofoam between the support base and the membrane


6 x 6 and membrane (roof)


Questions or Comments? Contact us!


Jacques Perron

Published August 21, 2013

Created by

Legal notice