Cavity Trays Ltd

Type G Cavitray
general-purpose cavitray for
changes of level and building
off the solid or ringbeam

in brief...

  • Easy and fast building-in with brickwork sized units
  • Adjoining lengths interlock
  • Adjustable upstand ensures cavity width compatibility
  • Traditional or timber frame construction
  • Unobstructed cavity compartment area
  • Establishes consistent build quality detail

use
Provides reliable DPC system for general-purpose applications including changes of level, diaphragm walls, porch and garage roof intersections, building off the solid, junctions with bay windows etc.

introduction
The Type G cavitray is designed for general-purpose horizontal applications. It is supplied in preformed lengths and preformed angles, all of which have end upstands. Long runs of tray are easily created as adjoining section ends unite and secure together within the perp joint. Thus a positive union is established. The Type G cavitray is available in three styles.

All the Type G versions feature an adjustable upstand (shown above) within the cavity, which accommodates cavity widths from 50mm up to 140mm.

type G cavitray
1 The Type G cavitray is available in standard lengths and special lengths to suit the project in question. Cavitrays eliminate all waste and ensure perfect stock control.
2 The end upstand or every cavitray incorporates a caisson locking and sealing moulding. This permits adjoining tray lengths to be positively and immediately locked together. Gluing and sticking by site operatives is eliminated. Standards are no longer dependent on the man on site who might not be trained or able to maintain 100% consistency or accuracy.

 3 Preformed angles ensure correct attention around corners, piers and projections.
4 Each type G general purpose cavitray incorporates a durable cavity upstand which is rigid and self-supporting yet fully adjustable. The upstand may be adjusted to suit various cavity sizes from 50mm to 140mm. The upstand does not require building-in to the inside skin. Thus the inside skin may be concrete, blockwork, brickwork, or timber frame as the Type G upstand ensures compatibility. The problems associated with methods which rely on support by building-in to the inside skin are eliminated.
5 The integral stopends of each unit ensure compliance with the latest recommendations regarding collection and dispersal of collected water. Type G cavitrays are compatible with our weepvents which may be incorporated within the external skin.

sizes
Standard profile suits most brickwork sizes incorporating cavities from 50mm in width up to 140mm in width. Standard tray length is 900mm to suit brickwork bonding. Standard profile as illustrated. Internal and external angles are manufactured to stated sizes unless otherwise scheduled.


 When required with a lead flashing attached to the tray, please specify the amount of lead to be left projecting and the lead weight (example: 150mm of code 4 lead left projecting).

When supplied with an attached lead flashing, allowance is automatically made for flashings to overlap adjoining flashings. Special angles, corners etc., to accommodate piers and columns are available.

non-standard
Type G cavitrays can be supplied in different/bespoke lengths to suit infill applications and specific requirements. Trays are simply manufactured to accommodate whatever masonry runs and sizes you are using. Likewise non-standard applications can be accommodated.

material
Upgraded type 10A solid damp-course. Lead flashing to BSEN 12588, 1999. Alternative materials available.

colour
Black.
Lead flashing, natural.

installation/site work
Type G cavitrays should be bedded in mortar, and masonry bedded onto trays.
Do not dry bed.
Ensure weep/vents are incorporated within the external skin at ray level.
designers'
comments

The Type G cavitray
emerging panolplied lip
provides protection to the
bedding course -
a feature which cannot be
achieved with conventional
felts and polymers. Trays
satisfy the requirements
of BS5628, BS8215 and
NHBS requirements.

Each Type G cavitray is a
closed-circuit unit, with
stand-alone collection and
discharge behaviour.
Weep/vents permit cavity
water evacuation and
cavity ventilation.
Because the cavity
upstand is hinged and of
a tensioned nature, it
accommodates the
as-built cavity status
rather than the as-intended,
whilst maintaining a clear
cavity compartment area.

The Type G may also be
used within diaphragm
walls. The widened cavity
and structurally connecting
brickwork cross-ribs of
the diaphragm wall accept
the cavitray which limits
the possible water
"pooling" to an area just
within the cavity void.
DPCs is a diaphragm wall
must not travel across to
the inside skin. Tray
upstands are built through
connecting cross-ribs.



Cavity Trays phone 01935 474769 fax 01935 428223 email enquiries@cavitytrays.co.uk