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Insulation of a roof from outside in Sarking

All regular and healthy frames can be insulated from the outside. It is most often during the repair of the roof that one opts for this type of solution, after cleaning and treatment of old chevrons or even replacement of the most dilapidated. But we can also deposit the cover to put in place this insulation which allows to take advantage of an increased habitable volume, the beauty and the charm of an apparent framework and a thermo-acoustic insulation performance. But this site is technical, do not hesitate to entrust it to a professional company as many options are possible.

Necessary material

  • Roofmate (polystyrene) or Luro (glass wool) panels
  • Vario Duplex Climate Membrane
  • Vario adhesive tape KB 1
  • HPV roof underlay

Steps

  1. Roofmate TG-X system
  2. Luro system
  3. Implementation of Luro insulation in sarking

Roofmate TG-X system

Diagram of the Roofmate TG-X system

Diagram of the Roofmate TG-X system

Roof mate TG-X extruded polystyrene foam panels, which are compatible with all types of roofs and roofs, have high mechanical properties giving them high rigidity. Machined on the four edges (grooves / tongues), they guarantee a total continuity of the insulation and the absence of thermal bridges. Their implementation is simple: the fixing of the chevrons is done, for example, using twisted nails. It is a very efficient solution for thermal insulation of roofs.

Luro system

Roof with Luro panels

Roof with Luro panels

The glass wool option offers an effective thermo-acoustic insulation to airborne noise (road noise) and impact noise (rain, hail). Impervious to its mineral nature, the Luro panel is rendered non-hydrophilic to withstand accidental wetting. Its compressive strength allows all types of covers. The fixing of the counter-chevrons on the insulation is carried out with special screws with double thread, the screws SFS Twin.

Sarking makes it possible to enhance the apparent wood structure

Sarking makes it possible to enhance the apparent wood structure

This solution also called "sarking" technique offers a comfort and a decor to live. It enhances, within the sub-slope, the warm aspect of the apparent wood frame.

Implementation of Luro insulation in sarking

Laying Luro panels on roof

Laying Luro panels on roof

1. A marking every 10 cm on the Luro panels facilitates their cutting. The counter-chevrons adapted to the existing frame must be of 60 mm of minimum width and placed in line with the rafters. The location of the counter-rafters can be easily materialized by their location at the bottom of the slope and on the ridge line. They are fixed with SFS Twin screws until flush with the screw heads on the counter-chevron. The screws are depressed at an angle of 30° (alternatively, upwards then downwards of each counter), which offers excellent resistance to tearing.

The screws are fixed on the counter-chevron with an angle of 30°

The screws are fixed on the counter-chevron with an angle of 30°

2. In 2-layer version, Luro panels are placed edge to edge and offset joints. Above 900 m altitude, to mitigate the risk of infiltration of powder snow, a roof underlay must be provided on the Luro panels.

(photos / visuals: © Isover doc, except special mention)

Isover

Isover
ISOVER develops high-performance thermal and acoustic insulation solutions for better energy efficiency of buildings, optimum comfort for their occupants and greater respect for the environment.

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