Gueule de Loup windows

“Gueule de loup” is the traditional French window in which the two leaves close directly one over the other, on a beak-shaped profile. That is where the name comes from.

With no centre mullion, the opening stays clear across its whole width. That is why this type of window appears again and again on old buildings and on those designed in their spirit.

About the product

A window that leaves the opening clear

In an ordinary two-leaf window a mullion remains between the leaves. In a Gueule de Loup window there is none: the active leaf closes over the passive one, and the beak-shaped profile makes the joint between them.

The result shows from the street. The window reads as a single opening and the proportions of the façade remain those the architect intended. For buildings whose original joinery was of this type, it is the only version that keeps the appearance.

We make this type of window in laminated timber, to order, to the actual dimensions and geometry of the opening. The division, the finish and the method of installation are settled for the project.

Benefits

Why this type of window is chosen

No centre mullion

The two leaves close one over the other, on the beak-shaped profile.

Clear opening

The opening stays usable across its whole width, both visually and practically.

Suited to heritage work

It is the right solution where the original joinery was of this type.

The proportions of the façade

The window reads as a single opening, not as two openings side by side.

Made to order

It is made to the actual dimensions of the opening, not to a standard size.

Finish to suit the project

The shade and the type of finish are settled for each job.

Applications

Where it is used

Technical details

Gueule de Loup — 58 mm

The traditional system of French joinery, with two sashes that close one over the other. The data below are those confirmed for this product.

A white timber Gueule de Loup window, with two sashes, glazing bars and an espagnolette fitted on the inside

Construction

Sash thickness
58 mm
Frame thickness
84 mm

Glazing

Glazing thickness
26 mm
Gas fill
Argon

Hardware

  • Espagnolette fitted on the inside
  • Fixed ornamental hinges

Construction principle

  • A traditional system particular to French joinery
  • Two sashes
  • A configuration intended to reproduce the look of traditional joinery

The remaining characteristics — transmittance, sound insulation, permeability or security classes — are established on the configuration ordered and are not published here.

Hardware and fittings

Hardware and fittings

In a Gueule de Loup window the active leaf closes over the passive one, with no centre mullion. It is exactly the configuration in which a functional espagnolette makes sense: it takes the locking vertically, at the head and at the sill.

Espagnolettes, in the functional version

Where the configuration of the joinery calls for it, the espagnolette is fitted functionally and actually does the locking: the lever turns the rod, and the rod engages the head and the sill. It is the traditional solution for this type of window. The espagnolette is the vertical bar on the leaf, with rods running up to the head and down to the sill. Depending on the configuration of the joinery, it can be functional — that is, it actually locks the window, through those rods — or it can be fitted decoratively, over concealed modern hardware. The decision is taken at design stage, together with the type of opening.

Decorative espagnolettes MCV C01-C06 for timber windows

MCV C01 – C06 espagnolettes

Six espagnolette designs, in brass, bronze and black finishes, with roses and levers of different shapes. They are chosen by the design of the joinery and by the finish of the rest of the hardware.

Decorative espagnolette sets MCV C7 and C8, with lever, rose and rod

Complete MCV C7 and C8 sets

The complete set for an espagnolette: the lever, the rose with a keyhole, the rod supports and the rod itself, supplied in the same finish. C7 in black, C8 in patinated brass.

Handles and hinges

They are chosen in the same finish as the espagnolette, so that the whole reads as one from the façade.

Decorative window handles MCV F01 and F02, with an operating spindle

MCV F01 and F02 window handles

Handles with a classic design and an operating spindle, for timber windows. F01 with an ornamental rose, F02 with an elongated backplate. They are fitted to the window hardware and operate it.

Decorative hinges MCV B01-B04 for timber windows and doors

Decorative hinges MCV B01 – B04

Visible hinges, with an ornamental pin. B01 galvanised, B02 and B03 in bronze and patinated brass tones, B04 in wrought black, with a shaped pin. They stay on show on the edge of the window, so they are part of how it looks.

Whether the espagnolette is functional or decorative is settled at design stage, together with the type of opening and the window hardware. Both versions are possible on the same espagnolette design.

Technical documentation

Do you need the technical sections?

The detail sections — head, centre and sill junctions — are not published on the site. We send them on request, for the configuration you are interested in.

Request the technical section

Gallery

Works carried out

The gallery for this product is being added to.

Photographs of completed jobs are still to be added here. In the meantime you can see the projects we have delivered in the portfolio.

See the portfolio

Next step

Do you need Gueule de Loup windows?

Send us the dimensions of the openings and, if you have them, photographs of the existing joinery. We will come back with a proposal.

Request a quote

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