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Unleaded Inter-loc Horizontal Cavity Trays for New Build and Existing Walls

Unleaded preformed horizontal cavity tray system, including corner and stop end units, suitable for new build and existing brick, block and stonework constructions.

Featuring integral interlocking lapped joints to securely join cavity tray lengths together and create a watertight run which eliminates the requirement of additional tray jointing adhesives (taping etc) on site.

For external wall constructions not exceeding 102.5mm in thickness and clear cavity widths of between 50mm and 125mm

  • trays to suit clear cavity widths of 126mm+ are available to order.

Available in two standard lengths, to allow build to standard brick bonding lengths for ease of use:

  • 4 standard brick length (900mm) for general use
  • 2 standard brick length (450mm) for making up a run to the required length.

Preformed horizontal cavity trays provide protection from water penetrating the external wall leaf of a cavity wall down through to the internal wall leaf in specific vulnerable areas across the building such as:

  • the abutment of a flat, lean to or mono-pitched roof
  • over concrete ring beams
  • over building components that can act as a through cavity carrier such as air bricks, metre boxes, ducts and cavity liners.

Also available supplied with convenient factory fitted lead flashings or a mortar barrier strip to aid the installation of post fitted lead.

Preformed cavity tray systems are an effective method of DPC and present many benefits such reliability, speed of installation, reduced cold bridging opportunity and site waste.

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Features & Benefits

  • Tough and stable DPC method
  • Suitable for brick, block and stonework constructions
  • To fit clear cavity widths of between 50-125mm
  • Can be time, labour and material saving
  • Cold bridging opportunities reduced
  • Generally doesn’t require cutting into insulation
  • 150mm high back upstand exceeds NHBC requirements
  • Interlocking tray joining system eliminates additional joining adhesives 
  • Allows inner and outer wall leafs to be built independently if required
  • Doesn’t degrade over time or under high loads
  • Isn’t affected by temperatures
  • Rigid construction that won’t collapse into cavity
  • Can be dispatched in convenient plot/area specific order consignments upon request

Applications

External cavity walls abutting flat, lean to or mono pitched roofs (and when lead flashings will be fitted independently to the trays) such as:

  • attached outbuildings and garages
  • conservatory and extensions
  • porches and bay windows
  • attached buildings with different roof lines.

Over concrete ring beams or slabs and components that can act as through cavity water carriers such as:

  • air bricks and cavity sleeves
  • ducts
  • meter boxes.

For external cavity walls built from standard brick, block and stonework:

  • not exceeding 102.5mm thickness
  • with clear cavity widths of between 50-125mm
  • non- standard requirements are available, please contact us with your project details.

Technical Information

With pre-formed cavity trays it’s not strictly necessary for the tray to span all the way across the cavity (except projects in severe weather exposure areas).

As long as the cavity tray stands back from the rear face of the masonry and projects back into the cavity far enough to intercept drips falling from the wall ties, then it will perform effectively.

If installing cavity trays with a partial fill cavity insulation, please deduct the insulation material depth to calculate the available ‘clear cavity width’.

Cavity trays work in conjunction with weep holes:

  • cavity trays collect and retain water inside the cavity wall
  • weep holes discharge water back out through the external cavity wall leaf
  • weep holes must be provided in every horizontal cavity tray to comply with Building Regulation requirements

We recommend that purpose made weep holes/weep vents are installed, such as Timloc’s:

  • wall weep vents – 1143 range
  • concealed wall weeps – TW1 range.

Stopends must be specified and installed if a cavity tray has to be cut down to suit the project.

How to order

We strongly recommend that customers take advantage of our free of charge cavity tray specification and project take off service.

Our Technical Services Team will be pleased to advise the most suitable products for your project and will prepare a fully itemised schedule of quantities if required.

To calculate horizontal tray quantities for standard brick/block length constructions:

  • divide the overall length of the cavity tray run by 0.225 (representing one standard brick and mortar joint) to give the number of trays required
  • divide the number of trays required by 2 for (IL2 2 brick tray) or 4 (IL4 4 brick tray)
  • always round up to the next tray - excess length has to be cut down
  • always use stopends if the cavity tray has to be cut down
  • stopends will not be required when the cavity tray run is built within the body of the building i.e. bay windows (for these applications the tray’s integrated stopend can be built into the next available joint projecting past the abutting roof).

Please provide the following project information with horizontal cavity tray enquiries:

  • type of roof construction (pitched, mono, flat)
  • length of abutting roof
  • external wall material and thickness
  • clear cavity width
  • cavity insulation material and thickness
  • are leaded, unleaded or unleaded with mortar barrier strip trays required?
  • are long or short lead lengths required?

Installation Advice

On-site installation and best practice guidance is all part of our service, please don’t hesitate to contact us to arrange a site visit.

Please don’t hesitate to contact the Timloc Technical Team if there is any doubt regarding installation.

When specifying and installing horizontal cavity trays it is important to consider the following recommendations:

  • Allow for the cavity tray run to be slightly longer than the overall width of the roof abutment or area requiring tray protection (a minimum projection of 150mm is recommended).
  • We recommend that horizontal trays installed to protect a roof abutment should be 150mm above the finished roof line - no less than 75mm.
  • The exposed area between the base of the cavity tray and the roof covering must be protected by an appropriate flashing.
  • Cavity trays must always be bedded onto fresh mortar - never dry bedded.
  • The masonry laid over the cavity trays must also be bedded onto fresh mortar - approximately half way through the mortar joint.
  • The cavity area must be kept clean and free from mortar droppings and debris.
  • A stopend must always be fitted at the start and finish of a run of cavity trays.
  • Inter-loc trays feature integrated stopends, however a separate stopend must be installed if the last tray in the run has to be cut down to suit the project.
  • Separate stopends are installed using pre-applied butyl mastic seal.
  • Ensure that the release paper is completely removed from the stopend and that the application area is clean and dry.
  • Pressure must be applied along the full length of the joint area once the stopend and cavity tray are brought together.
  • It is usually necessary to link a number of cavity tray sections together to form a continuous run.
  • Inter-loc cavity trays feature an integrated capping system for joining units.
  • If there is any doubt about the integrity of any joint DO NOT proceed until the joint is made good – apply additional suitable sealant if necessary.
  • Weep holes must be provided in the face of the wall along the cavity tray run to discharge any water collected within the tray system. 
  • We recommend that weep holes are formed using Timloc’s preformed wall weep vents (1143 range) or concealed tunnel weeps (TW1 range).
  • Weep holes should be spaced every 900mm along the run (450mm over lintels), ensure that 1 weep hole is provided per every Inter-loc tray in the run.
  • If necessary for the cavity tray run to turn a corner – always use a purpose made unit (external and internal corner units available).  Never try to site fabricate this critical detail.
  • High quality workmanship, cleanliness and attention to detail are essential with all cavity tray installations.

Quality, Regulations and Standards

  • Satisfies all NHBC requirements
  • Manufactured to BS EN ISO 9001 quality management system
  • Manufactured to BS EN ISO 14001 environmental management system
  • Complies with all relevant Building Regulations
  • Meets all relevant British Standards

Material and Colour Choice

  • Horizontal Inter-loc cavity tray units are injection moulded in 2mm polypropylene
  • Accessory products are vacuum formed in 2mm thick medium density polyethylene
  • Available in black only
  • nbs plus
  • riba

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