Sash window arrangement

A sash window comprising:

• window frame profile and a sealed window unit, the sealed window unit comprising two panes of glass and spacer means holding the panes in spaced parallel relationship, said spacer means including means preventing an entry of air into the space between the panes;
• the unit having at least one side edge, an inner face for facing inwardly into a building and an outer face for facing outwardly of the building to an exterior;
• the profile extending along said one side edge of the window unit so as to provide support thereof and comprising an integral unitary body defining, in cross section, a channel portion and a closed hollow support element for the channel portion;
• the channel portion having a first transverse web against which said one side edge of the window unit contacts and a first and a second side wall each upstanding from the first transverse web and contacting and confining respectively said outer and inner faces of the window unit adjacent said side edge;
• the support element being defined by said transverse web, an inner wall, an outer wall and a second transverse web substantially parallel to the first transverse web;
• the profile being manufactured from material such that the coefficient of thermal expansion of the profile in a longitudinal direction is substantially equal to that of glass;
• means for sealing the window unit in the channel portion against passage of air therebetween consisting solely of a bead of flexible sealant material in a corner of the channel portion between the second side wall contacting the inner face of the window unit and the first transverse web;
• said outer face of the window unit being directly in contact with the respective side so that the outer face of the window unit is free from exposed sealant material;
• means in the first transverse web defining at least one drainage opening for escape of water into the hollow support element;
• and means in the second transverse web of said hollow support element defining a drainage opening for escape of water therefrom.