CAVITY TRAYS LTD
ADMINISTRATION CENTRE
BOUNDARY AVE
LUFTON TRADING ESTATE
YEOVIL
SOMERSET BA22 8HU
Tel: 01935 474769
Fax: 01935 428223
Suppliers of: Cavity tray, Cavity tray unleaded, Cavity tray with lead, Cavity tray horizontal, Cavity tray refurbishment, Cavity tray gable abutment, Cavity tray conservatory, Cavity tray building regulations, Cavity tray NHBC, Cavity tray non combustible
Cavity Trays Ltd -Manufacturers of Cavity trays, DPCs, Radon Protection, Roof ventilation products & Cavity closers.
The only cavity tray manufacturer awarded European Technical Approval (ETA).
Useful Resources:
- Online Seminars Available: Click Here
- NBS Specifications Available: Click Here
Main Product Ranges:
Damp Proofing Products:
A wide selection of Cavity Trays, profiled DPCs and ancilliary products for all construction methods. Cavity trays can be supplied in all sizes and shapes from load bearing lintels to masonry support systems. Damp proofing Courses (DPCs) are available in preformed & profiled systems to provide excellent Damp Proofing Solutions. Other products include weep vents, flashings, remedial products and arresting barriers for all damp proofing problems.
Radon Products:
Cavity trays can also supply an extensive range of Membranes for all applications. These include: * Contaminated Land Gas Reception Sump * Gas and Water Outlets and Service Entry Points * Methane Barriers * Radon (Cavity) Barriers * Service Pipe Entry Seals (top hats) * Type N Sitesealer Membrane
Ventilation Products:
Cavity Trays supply a wide range of products to solve ventilation problems on all contruction projects. Products include: Air bricks, sleeves, Ventilators, Roof vents, roofline Ventilation for Soffits, eaves and Fascias.
Associated Products:
Cavity Trays offer a wide range of associated products to include: Masonry Attachment Profiles, Loft access doors & hatches, Eaves Protection, Bonding strips and valley gutters.
Cavity Closer Ranges:
Cavity Trays supply a wide range of Cavity Closers for all construction & refurbishment methods. Products include: Bespoke Traditional Cavity Closers, Fire integrity stops & barriers, Acoustic barriers, waterproof barriers, insulated cavity closers & barriers.
Main Product categories:
Cavity tray, Cavity tray unleaded, Cavity tray with lead, Cavity tray horizontal, Cavity tray refurbishment, Cavity tray gable abutment, Cavity tray conservatory, Cavity tray building regulations, Cavity tray NHBC, Cavity tray non combustible, Cavity tray NBS, Cavity tray flat roof, Cavity tray pitched roof, Cavity tray roof abutment, Cavity tray retrofit, Cavity tray rendered wall, Cavity tray roof, Weep, Weep rendered wall, Weep adjustable
Cavity Trays - Elevation Evaluation
Elevation evaluation for construction
Water penetration of the exterior leaf of a masonry wall is a common problem that can cause damage to the building envelope and affect the performance of the cavity insulation. The risk of water ingress depends on various factors, such as the location, exposure, design, and construction of the wall.
One way to assess the potential for water penetration is to look at the different levels of the wall, from the roof to the ground. The higher and more exposed a level is, the more likely it is to be affected by water from rain or other sources. For example, brick dentil coursing, which is a decorative feature at the top of a wall, can provide a water entry route due to cracks or gaps in its joints. On the other hand, a painted rendered area at ground level may be less exposed and less prone to water penetration.
However, even if water does not penetrate downward behind the render, it may still cause problems if it seeps into other parts of the wall. Therefore, it is important to evaluate whether there are any openings or defects in the wall that could allow water to enter or escape. Some examples of these are:
Weep holes: These are small holes in the cavity wall that allow water to drain out of the cavity and prevent moisture accumulation inside.
Damp-proof courses (DPCs): These are horizontal layers of material that run along the bottom of a cavity wall and act as a barrier against water ingress.
Wall ties: These are metal straps that connect different masonry units together and provide structural support and stability.
Insulation: This is any material that fills up space between masonry units and reduces heat loss or gain.
The type and style of lintel and sill also affect how well a wall can resist water penetration. A lintel is a horizontal beam that spans over an opening in a wall, such as a door or window. A sill is a horizontal ledge that supports a window frame. If these elements are not properly designed or installed, they may create gaps or cracks where water can enter or escape.
When designing and constructing your masonry walls, you should follow the following best practices to protect your building envelope from water penetration:
Use high-quality materials and workmanship that meet industry standards and regulations.
Ensure that all joints between masonry units are filled with mortar and have adequate profiles to prevent cracks.
Avoid using pointing techniques that create voids or depressions in mortar joints.
Install weep holes at appropriate locations along your cavity walls.
Use DPCs with suitable thicknesses and materials for your climate zone.
Use wall ties with appropriate sizes and shapes for your cavity walls.
Use insulation with suitable types and densities for your cavity walls.
The experts at Cavity Trays Limited have been providing solutions for all related situations to cavity walls for over 100 years. Our experience in developing innovative products for construction professionals means that we offer technical support, design assistance, speedy delivery, and a 30-year product warranty for our customers.
Cavity Trays - Damp after the storm
The recent weather conditions have brought to light ten construction details that can pose a challenge in dealing with wind-driven rain.
Traditional stepped running flashings – once the rain has been driven just a few millimetres under the running flashing leading edge, it permeates part of the building that should be kept dry.
Bay windows – sideways soak because there is no tray protection linking the bay lintel support level with the higher roof DPC intersection level.
Extensions – absence of tray at roof intersection level.
Window and door openings – inadequate and incorrect protection integration
To address these issues, Cavity Trays Ltd specialises in providing solutions for construction problems, both for new and remedial works.
As the UK’s longest-established cavity tray DPC company, Cavity Trays Ltd is the only manufacturer of cavity trays awarded European Technical Approval. We offer the broadest range of trays to meet NHBC and LABC requirements.
Cavity Trays Ltd are on hand to help you with our Technical Manual and pocketbook if you face any construction challenges related to wind-driven rain.
