Type Y Mullion Window Cavitrays Cavity Trays - Cavity TraysType Y Mullion Window Cavitrays Cavity Trays - Cavity Trays

Type Y Mullion Window Cavitrays

  • Preformed and packed per opening.
  • Consistent build quality detail.
  • Will not sag, distort or creep.
  • Black solid polypropylene.
  • Dimensioned to suit specific site details.

Preformed trays for use with mullion window surrounds and similar.


Mullion window assemblies manufactured from synthetic or real stone generally require a total of three cavitrays to maintain damp course integrity across the window head. Type Y stone mullion assembly cavitrays are preformed and each requires building into one skin only. An upper tray arrests the flow of penetrating water preventing the flow reaching the label-mould where a second tray offers protection where the cavity width is restricted. A third tray with optional insulation isolates connection between inner and outer skins.

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Where to buy

Our cavity trays are available from suppliers up and down the country.

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