Gueule de Loup

Gueule de Loup wooden windows are an icon of traditional French joinery, inseparable from Haussmann-style Parisian buildings. Their name refers to the specific way the sashes are joined: the "mouton" and the "gueule de loup" (wolf's mouth) form a unique structure with a distinctive look and significant practical advantages. One sash acts as the active leaf, the other as the passive leaf.

Gueule de Loup windows are fitted with characteristic espagnolette hardware and a decorative handle. The movable central mullion lets 15 to 20% more natural light into the interior than conventional windows.

Why it is worth recommending Gueule de Loup wooden windows:

• Historical authenticity: they are a direct reference to the architecture of prestigious districts of Paris and other historic French cities (they meet the requirements of the Architectes des Bâtiments de France).
• Exceptional brightness: they let in plenty of light thanks to the absence of a fixed mullion and the use of slimmer profiles than standard wooden systems.
• Effective sound insulation: they efficiently reduce city noise thanks to the properties of the whole structure and the way the sashes are joined.

Choose Gueule de Loup wooden windows if your customer:

• is renovating a historic building or wants to faithfully reproduce the Haussmann style;
• expects the highest quality offered by noble wood species, precisely finished and effectively protected;
• is looking for exceptional designs, with fittings that clearly set them apart from other wooden systems.

Technical features of Gueule de Loup wooden windows:

• Profile heat transfer coefficient: Uf from 1.1 W/m²K
• Espagnolette closing
• Available hardware and hinge colours: white (RAL 9016), black (RAL 9005), old gold
• Frame/sash height: 109–175 mm
• Minimum dimensions of the active sash: 325 x 625 mm
• Maximum dimensions of the active sash: 833 x 2144 mm
• Minimum dimensions of the passive sash: 333 x 625 mm
• Maximum dimensions of the passive sash: 841 x 2144 mm
• The sash width must be less than or equal to its height
• Minimum dimensions of the whole structure: 800 x 731 mm
• Maximum dimensions of the whole structure: 1816 x 2250 mm
• Maximum sash weight: 50 kg

*The above Uw value is given for a reference window measuring 1230 x 1480 mm with 4/16Ar/4th glazing, wood species: pine.