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You are here: Building Insulation - Roofing - With bitumenous tiles-Isoventilato System

Technical Specifications

  • Positioning of the edge stop beam
  • Lay down STIFERITE’s Isoventilato panel with laths parallel to the gutter.
  • Install panels using self-threading screws directly into the lath incorporated in the panel.
  • Seal the joining sections of the panels with waterproofing self-adhesive tape as protection against eventual formation of condensation.
  • Lay down and install ventilation wood laths and multi-layer wood support (plywood, OSB) using nails or self-threading screws directly to the lath incorporated in the panel.
  • Lay down bitumen tiles and ventilation elements (bird protector grill, ventilated ridge)

Instructions and Guidelines
When the pitch is less than 20-25%  use a bituminous membrane on top of the multi-layer wood support

The ventilation laths must be minimum 5cm in height and the distance between them at least 50/60 cm.

Also see: the installation procedure

The tables indicate the suggested thickness of Stiferite’s panels based on

  • Climate Zones
  • Current legislative set limits of thermal transmittance
  • And the following composition of the structure:


Suggested thickness
STIFERITE Isoventilato

DLgs 311/06

TAX deduction MD 65%
DM 26/10/2010

A 60 mm 70 mm
B 60 mm 70 mm
C 60 mm 70 mm
D 70 mm 90 mm
E 80 mm 100 mm
F 80 mm 100 mm

Note: For different composition of structures or material, we suggest using the calculation program available online (see: Thermal transmittance and verifications of condensation with Glaser method)




Tie point of Wall and Roof made of cement and micro-ventilated