CAVITY TRAYS LTD
ADMINISTRATION CENTRE
BOUNDARY AVE
LUFTON TRADING ESTATE
YEOVIL
SOMERSET BA22 8HU
Tel: 01935 474769
Fax:
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 Ltd - What Is A Weep Vent?
Cavity trays are essential components in construction, ensuring moisture control within cavity walls. One critical aspect of these trays is the weep, which facilitates drainage and ventilation. This article delves into the performance and functionality of cavity tray weep vents, with a focus on the Beak Weep manufactured by Cavity Trays Ltd. By exploring various models and their characteristics, we aim to provide a comprehensive understanding of why the Beak Weep stands out in the industry.
What are Weep Vents?
Cavity tray weep vents play a pivotal role in maintaining the integrity of cavity walls. These small outlets allow water that penetrates the outer leaf of a wall to drain out, preventing moisture from reaching the inner leaf and causing damp issues. Their design and placement are crucial in ensuring effective moisture management.
Types of Weeps
Most weep vents have minimal elevation visual presence, terminating at the elevation face with either a simple hole or a hole protected with a cover or beak. Different models offer varying levels of performance based on their design and functionality.
Weep Vent Presence and Functionality
When comparing weep vents, it is important to establish whether the viewable outlet dimensions are the smallest dimensions through which water or air flow must pass. Some open-hole models may have a weep vent outlet dimension that reduces part-way along within the moulding. Such dimension variance or restriction can impact flow measurements and overall performance.
The Beak Weep
The Beak Weep, manufactured by Cavity Trays Ltd, is designed without flow-route impingements, ensuring a consistent and effective drainage and ventilation pathway. Unlike some models, the Beak Weep aperture is protected against wind-driven rains, making it highly suitable for areas that are highly exposed.
Cavity Trays Beak Weep on orange surface
Advantages of The Beak Weep
The Beak Weep addresses the major concern of water-retention, where wind pressure can prevent evacuation and cause water to be trapped, potentially overwhelming the DPC/tray system within the wall. Additionally, the drop-outlet is dimensioned with upward radiused sides, permitting washed mortar sands to spread and drop at the outlet. This design minimizes the risk of blockage and maintains optimal functionality.
Performance in Exposed Sites
One of the standout features of the Beak Weep is its suitability for highly exposed sites. The protected outlet and high weep flow dimension ensure reliable performance even under challenging weather conditions. The radiused sides further enhance its effectiveness by allowing debris to be expelled easily.
Visual and Practical Benefits
While the advantages of the Beak Weep may not be immediately apparent upon visual inspection, its design offers several practical benefits:
Protected outlet
Highest weep flow dimension
Highest vent flow dimension
Suits highly exposed sites
Radiused sides allow spread and drop of washed
mortar debris.
Contact The Experts
To learn more about Weep Vent performance and optimisation, including dimensions and installation instructions or to enquire about any of our products, get in touch with us today or call us on 01935 474769.
The Beak Weep is manufactured by Cavity Trays Ltd, the longest-established cavity tray manufacturer.
Why Fire Rated Cavity Closers Are Essential for Modern Safety and Confinement
Fire rated cavity closers are essential for modern building safety. They play a critical role in preventing the spread of fire and smoke through cavity walls, ensuring the safety of building inhabitants. However, their effectiveness is highly dependent on correct installation and adherence to best practices. By understanding and addressing the real-world challenges of construction tolerances, builders can ensure that these critical components perform as intended, providing vital protection in the event of a fire.
Buildings should be constructed to eliminate or minimise, as much as possible, all potential fire and fire safety risks likely to arise. The building and its inhabitants should at all times be suitably protected. In theory, this should be a fairly straightforward undertaking, but in practice, the building envelope can present both designer and builder with considerations that are not always immediately obvious.
Understanding Cavity Wall Construction
Cavity wall construction relies on the external leaf (that can become saturated with rain) from not coming into contact with the inner leaf that is required to keep dry. Wall ties are shaped to structurally link the skins and prevent rain tracking across to the inner leaf. The cavity successfully separates and isolates the two. However, in the event of a fire, both air and fire can be drawn through the cavity within all the external walls of the building, fueling combustion. This raises the question of whether there is an optimum way of protecting the external envelope at one of the most frequently occurring features—where it is punctuated by window and door openings. Such openings present the designer and contractor with the usual heat-loss and damp-transference considerations, but with multi-occupancy and numerous other structure categories, there is also the additional important requirement to protect against fire and fire transference.
The Role of Fire Rated Cavity Closers
Fire-resistant cavity closers are an accepted way of addressing window and door reveals. A typical closer contains a non-combustible thermal and fire-resistant core that straddles the cavity, effectively linking both skins. Such closers provide passive fire protection. Applied to all four sides of an opening, the completed installation provides a level of fire resistance, commonly 30 or 60 minutes.
Testing and Standards for Fire Rated Cavity Closers
To establish the number of minutes, closers are subjected to testing at a fire research station. Such stations do a good job, and accordingly, best practice construction is witnessed. Products interface squarely, correctly, and consistently. However, if one looks at the actual on-site building tolerances, they are different, prompting the question of whether currently accepted site tolerances adversely affect the performance of fire-resistant cavity closers.
Are such tolerances compatible with those required with a fire-resistant closer, bearing in mind closer and masonry must interface consistently and without gaps, to perform? Construction tolerances accepted by various authoritative bodies vary, but in general buildings, the following are commonly witnessed:
Fire Rated Cavity Closer Installation
The optimum performance of any fire-rated closer is dependent on correct incorporation. Put simply, the relationship between a fire-resistant closer and masonry should match those under which the test results were achieved. Cavity wall openings constructed to the varied tolerances shown above differ from those used by testing stations and are unlikely to replicate the test results.
Testing stations qualify their test results relate only to the behaviour of the specimens of the elements of construction under particular conditions of test and do not reflect actual behaviour in fires. All openings in cavity walls should be formed squarely and uniformly, observing best practices to fulfill the objectives and requirements of Building Regulations Approved Document Part B.
Materials and Longevity
While functionality relies on continuous interfacing, core longevity can be aided with the use of stainless-steel metal ties as opposed to plastic ties securing the closer to the masonry. Metal ties that project through the closer body and continue into the actual protective core itself can extend the period the resistant core is anchored and held in position when fire is attacking with continuous interfacing and retention being the objectives. The building fabric should be constructed so that there are ‘no reasonably avoidable gaps within various elements, at the joints between elements, and at the edges of elements such as those around window and door openings,’ as stipulated within L1A 5.9.
Fire Rated Cavity Closer Considerations
Fire testing establishments and bodies such as the BBA quite understandably do not provide warranties. It is down to those constructing the building to aspire to the highest standards to get it right. While one continues to witness variable masonry tolerances, one questions whether building envelope fire resistance will actually provide the intended level of protection in the event of a serious fire. Compliant construction should leave nothing to chance.
A site agent of many years standing poignantly summed up the situation: ‘When you buy a new car, the manufacturers often claim it can travel an impressive number of miles per litre, and I do not doubt such a figure is honestly produced, albeit dependent on a featherlight foot on the accelerator, well-inflated tires, etc. Real everyday driving is different, and thus the resultant performance/fuel consumption will be different.
Learn More
Cavity Trays is an industry leader in the design, manufacture and supply of damp-proofing, cavity closers, ventilation, and other specialist products in the construction sector.
We have decades of experience helping businesses comply with all relevant building regulations. To learn more about our Cavity Closers, including dimensions and installation instructions or to enquire about any of our products, get in touch with us today or call us on 01935 474769.
