Warm Ballasted Method of Single Ply Roofing Application

Warm Ballasted Single Ply Systems

Warm ballasted single ply roofing systems offer an excellent solution for situations where access or recreation is a priority. Ballasted systems also provide maximum resistance against roof membrane damage and UV degradation, fire and noise.

A ballasted system relies on the weight of a ballast material, such as pebbles or paving slabs to secure the membrane and system in place.



  1. Ballast.
  2. Protection/Filter Layer.
  3. Sureplan FPO.
  4. Thermazone Insulation.
  5. Icopal Insulation Adhesive.
  6. Vapour Control Layer.
  7. Structural deck.

Sureplan FPO single ply roofing membranes are suitable for use in buried applications and do not require substitution with for alternative grades.

In a warm ballasted roof, it is common to install a typical adhered system with a fully bonded vapour control layer applied to the prepared structural deck. Insulation adhesive is applied to the upper surface of the vapour control layer and the insulation boards are bedded on top.

The roofing membrane is rolled out loose laid with adjacent sheets of membrane positioned to allow an overlap which is then hot-air welded together with a hot-air welder to provide a continuous waterproof covering.

A filtration/protection layer is then installed over the waterproofing to prevent fines from entering the drainage zones and protect the waterpoofing membrane from damage. The whole system is then ballasted using paving slabs on support pads, or 20-40 mm diameter river washed pebbles. The ballast should be sufficient to provide resistance to wind uplift forces.

Perimeter Fastening
Regardless of the type of membrane attachment, mechanical fasteners are always required at the roofs perimeter, angle changes and any details. This ensures that any tensions generated in the field membrane are not transferred to other areas.

Icopal offers a range of thermal insulation boards.

Typical insulation board used: Thermazone Roofboard


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