Designing the Right Single Ply Roofing System

Single Ply Roofing - Ballasted Warm Roof System

Warm ballasted single ply roofing systems offer an excellent solution for situations where access or recreation are 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.

 Monarplan_Ballested_Warm_350 jpg
  1. Ballast.
  2. Protection/Filter Layer
  3. Monarplan G.
  4. Thermazone Insulation.
  5. Icopal Insulation Adhesive.
  6. Vapour Control Layer.
  7. Structural deck

System Description

Monarplan G single ply roof membranes incorporates a fungicide additive that prevents organic growth within the ballast layer attacking the plasticiser in the PVC membrane ensuring the membranes performance is not compromised.

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 waterproofing 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.


Icopal offers a range of thermal insulation boards.

Typical insulation board used: Thermazone Roofboard

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