Masterframe Windows

• ▸Country: United Kingdom
• ▸HQ: Essex
• ▸Founded: 1984
• ▸Speciality: uPVC sliding sash windows for period home renovation
• ▸Accreditations: GGF member, Made in Britain
• ▸Market: Victorian and Edwardian home renovation, period property replacement windows
• ▸Climate context: UK - damp, mould risk, heritage building context, period streetscapes

• ▸Bygone sliding sash
• ▸Charisma sliding sash
• ▸Tilt-clean sash option

Masterframe's sliding sash geometry means there is no traditional outer casement face - the sash slides within the frame box. The cleaning access points and grime accumulation zones are entirely different from casement windows. The meeting rail on a Masterframe sliding sash is horizontal, central, and has two faces - the upper face (from the lower sash) and the lower face (from the upper sash). Both accumulate grime. The lower face is particularly neglected because it faces down and is not visible at eye level. Tilt-clean Masterframe sashes allow the outer glass face to be cleaned from inside by tilting the sash inward. This is convenient but creates an access order requirement - tilt and clean one sash at a time, return to position before tilting the other. The spiral balance channels at the sides of the Masterframe frame accumulate debris that transfers to the sash sides when the window is operated. These channels are often completely neglected and should be included in a thorough clean.

This is how I clean Masterframe Windows windows. The tools and technique below come from 25 years of daily professional work on the glass. Every step has been tested on real installations and adapted specifically for Masterframe Windows systems.

• ✕Do not tilt both Masterframe sashes simultaneously
• ✕Do not saturate the brush pile draught seals at the meeting rail with cleaning solution
• ✕Do not use bleach or chlorine cleaners on any Masterframe uPVC surface
• ✕Do not use solvent-based cleaners on colour-foil Masterframe finishes
• ✕Do not force a Masterframe sash if it is stiff - check spiral balance condition before applying force
• ✕Do not use abrasive pads on the frame or sash face

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