CAVITY TRAYS LTD
ADMINISTRATION CENTRE
BOUNDARY AVE
LUFTON TRADING EST
YEOVIL
SOMERSET BA22 8HU
Tel: 01935 474769
Fax: 01935 428223
Suppliers of: cavity wall trays abutment cavity wall trays preformed damp courses cavity wall closers abutment cavity wall closers air bricks roof ventilation soffit ventilation fascia ventilation roof
Cavity Trays Ltd - The only tray manufacturer awarded European Technical Approval (ETA).
View Installation Video on YouTube
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.
Membranes:
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.
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 catagories: Threshold cavity trays, Cavity cloaks, DPC, Remedial cavity trays, Cavity trays, Party wall trays, Cavity weeps, Wall ventilators, Valley gutters, Cavity closers, cavity closers sash frame, Fire barriers, Fire stops, Cavity closers wide cavity, Access panels fire resistant, Access panels, Cavity socks, Damp proofing membranes, Dampcourse jointing tapes, Dampcourses gas resistant, Membranes Contaminated land, Radon protection systems, Roof space ventilators, Ventilation grilles, air bricks, air brick adaptors, Ventilation roof void, Ventilation roof space.
These files are provided by the manufacturer. While Building Products Index takes every care to ensure the information is correct and up to date, we cannot be held liable for any out of date or incorrect information in them. You should check with before specifying or purchasing products.
Cavity Closer Brochure
Published [24/04/12]File size [2410 KB]
Cavity Gable Brochure
Published [24/04/12]File size [238 KB]
Cavity Product Guide 2011
Published [24/04/12]File size [20340 KB]
Cavity Trays Best Practice Guide
Published [24/04/12]File size [4286 KB]
Cavity Ventilation Brochure
Published [25/04/12]File size [2712 KB]
Conservatory Brochure
Published [24/04/12]File size [810 KB]
Where Timber Frame and Floors Meet - Best Practice
May 2012
Where Timber Frame and Floors Meet - Best Practice
Your Risk and Cost Considerations
The way in which timber frame construction and SIPS construction integrate with concrete foundations and floors is flawed. Reliance is placed on a number of separate elements working together as one, but they are actually unconnected so the resultant build detail cannot provide optimum functionality.
At ground level the operative is required to establish three protective dpc’s: One in the outer skin, one in the inner skin and the oversite membrane. But continuous protection requires all three to be linked, and failure to do so means the build detail has three principal weaknesses.
The three principal weaknesses are damp ingress, hygroscopic absorption and contaminated land gases entering the building envelope.
How the last of these weaknesses is best eliminated is currently the subject of the review of Part C of the Building Regulations which is focussed on making new buildings safer for the inhabitants.
The inner skin dpc relies on correct placement to act as a barrier against rising damp. The oversite membrane does not physically link up but merely terminates adjacent to the dpc by turning up against the inner skin. Consequently, contaminated land gases can enter the building envelope via the most common entry point – the floor/wall junction. There is no connected protection and settlement and movement cracking occurs - albeit often hidden under the skirting. Pending the placement accuracy of the inner skin dpc, this is also the area where dampness can be experienced if the inner skin dpc positioning is inaccurate. But contaminated land gases can also enter by rising up through the cavity and the current Part C consultation data refers to oversite membranes linking with protection in the wall. By having separate dpc’s in the inner and outer skins, there is nothing to address the cavity when building the conventional way.
The alternative approach offered by Cavity Trays Ltd is called the Type TFC – Timber Frame Cavitray. It combines the inner and outer skin dpc requirements and does so in a way that offers several important accompanying benefits. The one-placement - one-solution Type TFC establishes unpunctuated protection.
It protects the outer skin and then rises transversing the cavity and at a higher level projects inwardly. The inward projection extends through and beyond the inner skin, providing substantial inboard presence to unite horizontally with the oversite membrane. All the separate unconnected weak areas associated with separate dpc’s are eliminated.
The arrangement also arrests rising contaminated gases from progressing upwardly in the cavity. Instead they are safely discharged out of the wall via cavibricks located below TFC level around the base of the building. The cavity spanning portion means water penetrating the building envelope at higher level is arrested on top of the barrier where caviweeps located in various perp joints provide evacuation routes. This arrangement eliminates volume pooling within the base of the cavity, and this can be advantageous if the land under the building offers poor drainage or is of rock or has a high water table.
Within the cavity the Type TFC profile has a vertical projection that locates against the inner timber frame skin. Apart from aiding optimum placement, this laps and covers the timber that frequently remains partly exposed to the cavity along the bedding course. Hygroscopic exposure of the timber to the usual cavity moisture is thus prevented.
By combining the dpc requirements for both masonry skins with a cavity barrier that extends upwardly and inwardly, the resultant Type TFC provides functionality, an improved standard of build detail and an arrangement that offers greater protection against contaminated land gases.
The Type TFC is manufactured from gas-grade resistant Petheleyne in various profiles. The inboard projection can also be cranked to suit different floor/slab arrangements. Profiles are semi-rigid and supported with a range of preformed angles and steps to suit. Adjoining sections link using gas-grade anchoring strip. Non-standard profiles and angles are normally available within five days.
The current main technical manual of Cavity Trays Ltd is number 22.
Details of the Type TFC are on page 30 in the current Book of Wise Decisions / Best Practice Guide, volume 40.
Cavity Trays Limited Administration Centre Yeovil Somerset BA22 8HU
T: 01935 474769
F: 01935 428223
enquiries@cavitytrays.co.uk
www.cavitytrays.co.uk
Where Timber Frame and Floors Meet - Best Practice
May 2012
Where Timber Frame and Floors Meet
Best Practice - Your Risk and Cost Considerations.
The way in which timber frame construction and SIPS construction integrate with concrete foundations and floors is flawed. Reliance is placed on a number of separate elements working together as one, but they are actually unconnected so the resultant build detail cannot provide optimum functionality.
At ground level the operative is required to establish three protective dpc’s: One in the outer skin, one in the inner skin and the oversite membrane. But continuous protection requires all three to be linked, and failure to do so means the build detail has three principal weaknesses.
The three principal weaknesses are damp ingress, hygroscopic absorption and contaminated land gases entering the building envelope.
How the last of these weaknesses is best eliminated is currently the subject of the review of Part C of the Building Regulations which is focussed on making new buildings safer for the inhabitants.
The inner skin dpc relies on correct placement to act as a barrier against rising damp. The oversite membrane does not physically link up but merely terminates adjacent to the dpc by turning up against the inner skin. Consequently, contaminated land gases can enter the building envelope via the most common entry point – the floor/wall junction. There is no connected protection and settlement and movement cracking occurs - albeit often hidden under the skirting. Pending the placement accuracy of the inner skin dpc, this is also the area where dampness can be experienced if the inner skin dpc positioning is inaccurate. But contaminated land gases can also enter by rising up through the cavity and the current Part C consultation data refers to oversite membranes linking with protection in the wall. By having separate dpc’s in the inner and outer skins, there is nothing to address the cavity when building the conventional way.
The alternative approach offered by Cavity Trays Ltd is called the Type TFC – Timber Frame Cavitray. It combines the inner and outer skin dpc requirements and does so in a way that offers several important accompanying benefits. The one-placement - one-solution Type TFC establishes unpunctuated protection.
It protects the outer skin and then rises transversing the cavity and at a higher level projects inwardly. The inward projection extends through and beyond the inner skin, providing substantial inboard presence to unite horizontally with the oversite membrane. All the separate unconnected weak areas associated with separate dpc’s are eliminated.
The arrangement also arrests rising contaminated gases from progressing upwardly in the cavity. Instead they are safely discharged out of the wall via cavibricks located below TFC level around the base of the building. The cavity spanning portion means water penetrating the building envelope at higher level is arrested on top of the barrier where caviweeps located in various perp joints provide evacuation routes. This arrangement eliminates volume pooling within the base of the cavity, and this can be advantageous if the land under the building offers poor drainage or is of rock or has a high water table.
Within the cavity the Type TFC profile has a vertical projection that locates against the inner timber frame skin. Apart from aiding optimum placement, this laps and covers the timber that frequently remains partly exposed to the cavity along the bedding course. Hygroscopic exposure of the timber to the usual cavity moisture is thus prevented.
By combining the dpc requirements for both masonry skins with a cavity barrier that extends upwardly and inwardly, the resultant Type TFC provides functionality, an improved standard of build detail and an arrangement that offers greater protection against contaminated land gases.
The Type TFC is manufactured from gas-grade resistant Petheleyne in various profiles. The inboard projection can also be cranked to suit different floor/slab arrangements. Profiles are semi-rigid and supported with a range of preformed angles and steps to suit. Adjoining sections link using gas-grade anchoring strip. Non-standard profiles and angles are normally available within five days.
The current main technical manual of Cavity Trays Ltd is number 22.
Details of the Type TFC are on page 30 in the current Book of Wise Decisions / Best Practice Guide, volume 40.
Cavity Trays Limited Administration Centre Yeovil Somerset BA22 8HU
T: 01935 474769
F: 01935 428223
enquiries@cavitytrays.co.uk
www.cavitytrays.co.uk
