Home > Companies > Cavity Trays Ltd > Type LTT Level Threshold Tray


  • Solid petheleyne damp proof course (DPC) which encapsulates the threshold masonry to prevent the passage of moisture from the exterior skin to the inside, regardless of the type of floor finish.
  • Acts as a threshold DPC and additionally extends downwards over both faces of the masonry. The ends of the tray rise and wrap around the reveal masonry.
  • Permits abutting flooring, insulation, DPC's and damp proof membranes.
  • The visible downward projecting section below sill level can be left in position to interface within the gap provision between any abutting paving or ramp. Alternatively, it may be removed along a separation indentation just below the sill, leaving a small projective bedding lip, which conforms to BS 5268 A.
  • Bespoke service for non-standard dimensions.


Suitable for use with most styles of conventional and level thresholds.

Standard product features



NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-25-20/415 Preformed cavity trays

Product specification

An important note about specifying



Cavity Trays Ltd


+44 (0)1935 474769

Product reference

Type LTT Level Threshold Tray


[1.5 mm]
[2.0 mm]


As drawing ___

Drop option

[150 mm]
[200 mm]

Manufacturer details

Administration Centre,
Lufton Trading Estate,
Somerset, BA22 8HU
Tel +44 (0)1935 474769
Fax +44 (0)1935 428223
NBS Plus