Enka^®-Vent
Metal roofs are used extensively throughout the world in all climates for functional and architectural purposes on commercial and domestic properties. For buildings to be durable, their design and construction must suit local climatic conditions, including temperature, humidity, rainfall and interior climate. For example in cold regions, condensation is a major concern while in other regions moisture flow management is important.

Installed between the waterproof underslating and the metal sheathing, Enka-Vent functions as expansion and ventilation layer and allows the evaporation of penetrated rainwater and condensation. It also functions as a sliding plane for movements of the metal sheathing due to temperature differences. At the same time it avoids capillary water transport between underslating and metal sheathing and acts as an "anti-noise layer", reducing the drumming noise of the rain considerably. (PDF file: "Article underslating - drainage composite layers in metal roofings.pdf")


Source: Rheinzink GmbH & Co. KG, Datteln, Germany



For Zinc roofs, two different types of roofs can be determined:
Non-ventilated roofs without a ventilation layer between the wood and the isolation layer, and ventilated roofs including a ventilation layer. Below is an example of a cross section of a non-ventilated roof. In a ventilated roof, there is an air space between layer no. 4 (Plywood/ OSB) and layer no. 5 (thermal insulation).



Non-ventilated roof:

  1 = Standing seam roofing e.g. titaniumzinc or copper
  2 = Enka-Vent
  3 = Waterproofing membrane
  4 = Plywood/ OSB
  5 = Thermal insulation
  6 = Rafter
  7 = Plywood/ OSB
  8 = Vapour barrier
  9 = Support batten/ cavity for electrical work
10 = Inner Cladding


Download brochure Ventilation Layer for Metal Roofs (pdf file):
Enka-Vent