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 Types Of Roof Ventilation Explained
Roof ventilation facilitates continuous airflow through the roof space, and prevents the build-up of warm moisture-laden air. Without adequate ventilation, several problems can arise, the most common being condensation and mould.
UK Building Regulations and guidance from the NHBC and LABC state adequate ventilation is a legal requirement in both new-build and renovation projects. Pitched roofs should be ventilated to limit the risk of interstitial condensation and be in accordance with BS 5250:2021
Air and vapour permeable roofing felts can be used to address the requirements of a wide range of roof configurations, but not all. There are situations where the mandatory airflow level can only be achieved by incorporating supporting measures. Far more moisture is allowed through breathable membrane than non-breathable, meaning that increased airflow is recommended for the most effective solution.
Small roof areas (3m2 or less) such as those over porches or bay windows are commonly the subject of a condensation risk analysis to ensure the risk of interstitial condensation is mitigated.
Similarly, where a continuous air and vapour control layer is impractical to install in larger pitched roofs incorporating insulation, the design should limit the risk of interstitial condensation by providing 25,000mm2/m eaves ventilation and 5000mm2/m ridge or high level ventilation should be provided below the underlay. A minimum 25mm clear ventilation pathway is required below the underlay.
Different types of roof ventilation solutions
Designed to address specific needs, the following examples permit the designer and builder to fulfil performance objectives and address aesthetic options/variations.
Fascia Ventilators
Fixed to the top edge of the fascia boards of a roof, Type OFV Over Fascia Ventilators allow air to flow in and out of the attic or roof space. Fascia cost is reduced as a smaller (less high) fascia is used, with the Type OFV substituting the final fascia rise. Not visible once the roof overhang and guttering are present, two models are available with 12,500mm² and 25,000mm² airflow ratings.
Type OFV-10 Over Fascia Ventilator Ventilation - Cavity Trays
The Type OFV is just one example from three fascia level ventilator types available to the designer.
Soffit Ventilators
When thermal insulation within the roof space of an existing property is increased, it is commonly necessary to also upgrade the ventilation. Ventilation apertures (70mm holes) are introduced through the soffit on opposing sides of the property to receive circular soffit ventilators (Type CSV). Once installed, air can flow into and out of the roof space (as long as the insulation laid within it is restrained from blocking the flow route where the converging roof timbers approach plate level). The installer may choose whether the Type CSV Circular Soffit Ventilators are fitted in a ‘see’ or ‘no see’ status.
Type CSV ventilators have a deflecting louvered face, providing positive air entry and insect screening. Unlike standard grille ventilators, rotating the Type CSV so the louvers slope downwards towards the property masonry face results in the ventilation openings being almost hidden from view, when viewed from the ground. By selecting a Type CSV in a colour to match that of the fascia, the soffit can maintain a continuous unbroken appearance. It is also available in seven colours and has an airflow rating of 2,100 mm², so fewer need be installed to provide the required performance level.
Alternatively, fitted with the louvers facing the opposite direction – outwardly – provides a punctuated soffit appearance. The designer has a choice.
Type CSV Circular Soffit Ventilators Ventilation - Cavity Trays
The Type CSV is just one example from eight soffit ventilator types available to the designer.
Eaves Ventilators
Eaves ventilators allow air to enter the roof space from the eaves, balancing the temperature inside the attic with the outside environment to prevent condensation.
The Type EROV – Eaves Roll-out Ventilator is a flexible, easy-to-install ventilator that offers evenly spaced airflow along the eaves. Where accompanying insect protection is essential such as in an open-eaves detail, the Type OEVWF -Open Eaves Ventilator with Flyscreen provides effective pest control in addition to ventilation.
Type EROV 400 Eaves Roll-out Ventilator Ventilation - Cavity Trays
The Type EROV and Type OEVWF are just two examples from six eaves ventilator types available to the designer.
Soffit Ventilator Strips
Strip soffit ventilators running along the soffit provide continuous uniform ventilation in and out of the roof space preventing the buildup of moist air. In addition to our standard, easy-to-install Type SSV Strip Soffit Ventilator, our range includes specialised strip soffit ventilators suited to meet the demands of more complex roof designs of both new and existing properties. The Type RASV Reversible Angled Soffit Ventilator features a reversible design for flexibility and installation at various angles, ideal for sloping soffits, whilst the Type USV has a hidden fixing feature making it suitable for both new and refurbishment/upgrading projects.
Type SSV-RU Strip Soffit Ventilator with reduced upstand Ventilation - Cavity Trays
The Type SSV, Type RASV and Type USV are just three examples from seven strip soffit ventilator types available to the designer.
Learn More
See the full range offered by Cavity Trays Ltd. For more see the The Book of Wise Decisions and our Technical Manual Protecting the Building Envelope containing technical data and helpful guidance. Both are available in hardcopy form, without charge upon request. Alternatively, visit our resources page for more.
Remember, whilst standard products are suitable for most applications, some projects require bespoke solutions. Cavity Trays is able to manufacture custom ventilation solutions tailored to specific project needs. Unique architectural designs, historic building renovations, or new builds with unconventional roof structures. Contact Cavity Trays Ltd.
Get in touch with Cavity Trays today
Call our team on 01935 474769 or email enquiries@cavitytrays.co.uk
Non-combustible Beak Weeps from the longest-established cavity tray company.
Superior Functionality with Minimal Visual Presence
Manufactured of zinc pressure die-casting, the new NonCom Beak Weep can be built into a naturally occurring perp joint with a discreet emergence, promoting functionality with minimal visual presence.
What’s more, in addition to being protected from direct wind and rain ingress, the evacuation outlet has radiused sides permitting washed mortar sands and fines to spread and drop. The internal flow route is direct and features zero restricting areas or pinch-points between the cavity inlet and the elevation outlet.
Building Regulations Compliance
New Building Regulations require the exterior walls of buildings more than 11m high to be constructed of non-combustible materials. The NonCom Beak Weep is an A1-rated non-combustible perp weep, designed explicitly for use with non-combustible cavity tray systems of high-rise and fire-resistant buildings.
This innovative non-combustible cavity wall weep features a trapezoid design and discreetly hooded external discharge outlet offering deflection protection against torrential rain and wind conditions.
The NonCom Beak Weep may be used in structures required to meet and conform with UK / European Standards, requiring EN 1774 1997 and A1 fire specification as defined by Commission Decision 96/603/EC.
When installed as part of a compliant wall assembly, NonCom Beak Weeps will satisfy Building Regulations across the UK, including:
The Building Regulations (England and Wales (2010)
The Building Regulations (Scotland) Regulations 2004
The Building Regulations (Northern Ireland) 2012
NHBC/LABC (in select instances)
This makes them the ideal solution for use within high-rise, fire-resistant buildings rising to 11m or more from ground.
Our new NonCom Beak Weeps are 100% compatible with Cavitray systems, include both masonry or mortar merge option, and are sold range of beak overspray colours to match the aesthetic of high-rise buildings of all descriptions.
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 NonCom Beak Weeps, including dimensions and installation instructions or to enquire about any of our products, get in touch with us today. Call our team on 01935 474769 or email enquiries@cavitytrays.co.uk
