How do you calculate cavity trays?

How do you calculate cavity trays?

Cavity tray quantities can be calculated by using the angle of the roof and the tile run length of the abutment.

Where is a cavity tray required?

A cavity tray should be provided 150mm above any adjoining roof or balcony surface. The tray should be lapped over any roof upstand or flashing to ensure water penetrating into the cavity does not enter the enclosed area.

What is a lintel tray?

The Lintel Tray is made of tough, durable polypropylene and will protect cavity wall lintels against corrosion from moisture. Any water collects on the top of the lintel tray and is contained by the stop ends. The water is then directed to the outside of the building through Peep or Weep Vents in the outer cavity.

How many cavity trays do I need?

To calculate quantities, allow one cavity tray per course on each roof slope. One stopend starter or corner starter is needed per roof slope, and one ridge tray at each apex. Check roof pitch and select the correct length of tray to suit it.

What are cavity trays made of?

Cavity trays can be formed using a pliable material such as lead, but more commonly they are pre-formed, with a wide range of shapes allowing for different cavity widths, corners, stop ends, steps, lintel shapes, arch shapes and sometimes incorporating external flashing.

How do you install a lintel cavity wall?

Installing a Cavity Wall Lintel

1. Ensure that masonary overhang does not exceed 25mm.
2. Ensure lintel is level along its width.
3. In cavity walls, raise inner and outer leaves supported by lintel together.
4. Masonary above lintels should be allowed to cure before applying floor and roof loads.

Why do I need a cavity tray?

A cavity tray is something that many of our customers will be unfamiliar with but it can be an important addition for conservatories and orangeries. The purpose of it is to prevent rainwater from penetrating any cavity wall and causing water damage to any windows and doors within a conservatory or orangery design.

Can you retrofit a cavity tray?

Type E cavity trays are beneficial for retrofitting projects as they only require one course of bricks to be removed, which saves time, disturbance of the building structure, and costs. …

How do you install a cavity wall lintel?

What is a cavity closer?

Essentially, a cavity closer makes up part of a cavity wall, where windows and doors are fitted. Their main purpose is to protect the building from things such as damp, condensation and heat loss. The cavity closer takes the form of a seal to prevent any water and damp from entering the cavity wall and building.

Can cavity trays fail?

Problems can occur when the cavity tray goes under any flashings or DPC’s associated with the detail. Failure to extend the cavity tray in front of the window head may divert water down the face of the frame or onto the back of the frame, where it may accumulate in weathering grooves.

What is a keystone non-combustible cavity tray lintel?

The Keystone Non-combustible Cavity Tray Lintel offers a non-combustible stainless steel single leaf lintel with combined cavity tray.

Why install a lintel in the outer leaf?

The ease of installation in the outer leaf combines the structural load bearing lintel with the advantages of a self supporting cavity tray. NHBC Standards clause 6.1.12 Lintels states that cavity trays should be provided at all interruptions to the cavity (e.g. windows and door openings and air bricks) Unless Otherwise Protected.

What is a cavity tray system?

Our innovative non-combustible A1 fire rated Cavity Tray system is a practical solution to provide DPC protection over lintels, masonry supports, soffit systems and other elements in the cavity such as fire barriers. Why Specify Keyfix NCCT?

What are keykeyfix’s document B cavity tray system standards?

Keyfix is setting new standards in the delivery of Non-combustible Cavity Tray Systems for projects requiring Document B compliance in buildings utilising steel frame systems in the external cavity.