KIWA Steel Frame Direct Fix Stone Wool - Stone Wool Insulation
Verified by manufacturer over a year ago
KIWA BDA
Certificate type
Direct fix external wall insulation system with stone wool insulation.
Application
External wall insulation, direct fix, steel frame.
Description
Direct fix external wall insulation system with stone wool insulation.
The system consists of mineral wool insulation which is mechanically fixed to the existing structure. An adhesive basecoat is applied with a reinforcement mesh, mechanically fixed back to the existing structure (additional adhesive fixing is necessary on a project specific basis where a breather membrane is not required).
Stress patches are applied over the fixings. Primer is applied before the application of a silicone finish. Brick slip adhesive is applied before the application of the brick slip. The brick slips are then pointed with mortar.
General information
Color | Other Guidance for specification option: Various colours available. Contact manufacturer for details. |
Finish | Brick |
Material | Silicone |
Shape | Other |
Length | Bespoke |
Width | Bespoke |
Height | Bespoke |
Warranty description | Ten year |
Uniclass | |
CAWS | M21/20 External wall insulation system . . . . . . M21/210 External wall insulation system |
Specification data - External wall insulation systems
System performance | Thermal performance.Guidance for specification option: The systems can improve the thermal performance of external walls and can contribute to satisfying the requirements of the National Building Regulations. Strength and stability.Guidance for specification option: The systems can adequately resist wind loads and impact damage. For further information please systems certification for further information. System tested to BS EN 13501-1.Guidance for specification option: Achieves a value of A1 reaction to fire with the brick slip system and A2-s1, d0 reaction to fire with the silicone system. Risk of condensation.Guidance for specification option: The system can contribute to a limiting risk of interstitial and surface condensation. Durability.Guidance for specification option: When installed and maintained in accordance with the Certificate holders recommendations and this Certificate, the system will remain effective for at least 30 years. Further Information.Manufacturer guidanceFor further information on these points, please refer to the system’s KIWA BDA Certificate. |
Preparation | Breather membrane.Guidance for specification option: A breather membrane may be specified by the project designer/ frame manufacturer. Where this is positioned on the face of the sheathing board, the membrane will prevent the Wetherby system from being adhesively fixed to the substrate. Wetherby must be contacted if a breather membrane is installed to the face of the sheathing board and the specification revised to reflect this, possibly resulting in an increase in mechanical fixings. Treatment to substrate.Guidance for specification option: Remove any defective areas of the existing substrate and where required make repairs ensuring the surface is ready to receive the EWI system. The existing walls are to be cleaned to the satisfaction of the Contract Administrator, to remove any friable material, algae or lichen. WBS Biocidal Wash can be used to treat areas of moss, algae and mould growth. Where required, apply one coat of Wetherby Biocidal Wash to the entire surface by roller or knapsack spray and allow to dry. Brush the surface to remove all signs of growth before work commences. Manufacturer guidanceAll sheathing boards must achieve minimum pull out requirements to be suitable for the system application. The substrate to receive the WBS system must be completely dry and not damaged by rain / frost to reduce the board performance in any way. The board manufacturer should be consulted and pull out tests redone before continuing if rain / frost damage is evident. The substrate shall be clean and structurally sound. Sheathing boards / panel substrates should be line and level ensuring insulation boards can be installed flush to the substrate. Slight variances in the substrate can be overcome by using the WBS Insulation Bedding Adhesive where no membrane is in place but packing out of the insulation boards on direct fix applications is not recommended. All sheathing boards must be securely fixed, correctly jointed and sealed (where required) as per the board manufacturer’s instructions. If the walls are not line and level, the fixing lengths must be checked to ensure adequate embedment into the sheathing board / frame substrate. This will need to be confirmed on site prior to the installation of the Wetherby system. Sizing of flashings, trims and beads may also require alterations. |
Support rails and brackets | |
Fixing method | |
Material | WBS aluminium brick slip base rail.Guidance for specification option: Securely fix Wetherby BSR starter track above DPC level at base of the system. Mechanically fix starter track at max. 300mm centres, 50mm from each end. WBS 3756 base rail connectors should be used to join the tracks, packing shims may be required to ensure the starter track is true to line and level. Any gaps behind the basetrack allowing free air movement behind the insulation should be sealed appropriately. WBS aluminium base rail.Guidance for specification option: Securely fix Wetherby starter track with profile clip above DPC level at base of the system. Mechanically fix starter track at max. 300mm centres, 50mm from each end. WBS 3756 base rail connectors should be used to join the tracks, packing shims may be required to ensure the starter track is true to line and level. Any gaps behind the basetrack allowing free air movement behind the insulation should be sealed appropriately. |
Bracket fixings | LS 5.5 (steel frame).R-QCP (timber frame). |
Boards | |
Material | Manufacturer guidanceInsert requirements. The framed substrate must be sheathed using a Wetherby-approved sheathing board ensuring that they achieve minimum pull out requirements to be suitable for the systems application. This must be done prior to installing any component of the Wetherby system. |
Fixings | Boards are fixed in accordance with site conditions and manufacturer's instructions. |
Insulation | |
Material | Stone wool insulation.Guidance for specification option: Thermal performance ranging from 0.036, thicknesses compatible with the system’s certification range between 50–250 mm. Board size: 1200 x 600mm. Minimum compressive strength: 10 kPa. Thermal conductivity: 0.036 Wm²/K. Performance in relation to fire:
Environmental:
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Additional mechanical fixings | TKR screw range.R-QCP screw range. |
Movement joints | |
Form with | WBS stainless steel movement joints.WBS PVC movement joints.WBS stainless steel surface-mounted render stop beads.WBS PVC surface-mounted render stop beads. |
Sealant | Compriband sealing tape must be installed between the insulation boards.Manufacturer guidanceThe manufacturer insists that all structural movement joints are mirrored through the EWI System. As a minimum they would typically expect a render system to incorporate the movement joints every 7–10 m vertically and at every other floor level horizontally. Structural Engineers will be required to confirm how much movement will occur and where movement joints are located in the substrate give an indication where the joints will need to be installed. All movement joints and surface render beads must be fully meshed in, applying silicone sealant where necessary. |
Render carrier or reinforcement | |
Material | WBS scrim adhesive.WBS Heck K+A scrim adhesive.Glass fibre reinforcement mesh.Manufacturer guidanceTrowel or machine apply a 4–6 mm-thick coat of scrim adhesive to the entire surface of the insulation boards. Lightly run a notched trowel through the scrim adhesive at a 45° angle to ensure the correct thickness of adhesive is applied. Bed WBS Alkali Resistant Scrim Cloth into top third of the wet adhesive, overlapping joints by 75 mm minimum (ensuring mesh cloth isn’t over embedded). The scrim cloth must be overlapped around all building corners, stop beads, movement beads and returned into all reveals and heads. All beads must be fully scrimmed in. Install additional 500 x 250 mm minimum pieces of scrim cloth diagonally across corners of all wall window and door openings including for any utility box areas. |
Mesh size | Manufacturer's standard.Guidance for specification option: Supplied in 50 m² rolls. |
Fixings | TKR screw range (main steel fixing).R-QCP screw range (main timber fixing).TKE range – steel frame - stainless steel screw.R-UCF range – timber frame - stainless steel screw.Manufacturer guidanceInsulation fixings through mesh and second layer of mesh: Fix boards mechanically to the substrate using approved WBS fixings as per the WBS fixing pattern (fixing pattern located at the back of that document subject to wind load calculations). Fixings shall be installed through the wet WBS scrim adhesive and WBS alkali resistant mesh. Additional fixings should be installed to ensure a maximum of 300 mm centres at either side of building corners and around all openings. If required install stainless steel secondary fixing through the scrim adhesive and alkali resistant scrim cloth whilst wet. Finally smooth out scrim adhesive using a spatula. Allow sufficient drying time before applying second layer of scrim adhesive.
Scrim adhesive coat (second application): Trowel apply a further 3–4 mm-thick coat of scrim adhesive to the entire surface of the first pass of basecoat and mesh cloth (once dry). Lightly run a notched trowel through the scrim adhesive at a 45° angle to ensure the correct thickness of adhesive is applied. Bed WBS Alkali Resistant Scrim Cloth into top third of the wet adhesive, overlapping joints by 75 mm minimum (ensuring mesh cloth isn’t over embedded). Level the scrim adhesive using a spatula/ speed skim. As the basecoat tightens remove any lines/ ridges using a purpose-made sponge float to achieve a uniform flat and even surface ready to receive the WBS final finish. Ensure all fixings and mesh are fully covered and are not visible and allow for sufficient drying time before applying the Wetherby Primer or for the brick slip system scratch scrim adhesive horizontally in preparation for the WBS Brick Slips. Allow sufficient drying time before applying the Wetherby Brick Slips. |
Render | |
Material | Heck silicone primer.Guidance for specification option: Apply Wetherby Primer with a brush or lamb’s wool roller as per manufacturer’s printed instructions. Allow primer to fully dry, minimum 12 hours. Brick slip adhesive.Guidance for specification option: Trowel apply full spread of brick slip adhesive to the scrim adhesive. Use a 10 mm notched trowel to ensure minimum 5 mm thickness is achieved. |
Decorative finish | Heck silicone render finish.Guidance for specification option: Mix and apply Wetherby Silicone Textured Finish strictly in accordance with the manufacturer’s printed instructions. The top coat should be applied with a stainless steel trowel to the thickness of the grain and finished with a plastic float. Apply in a continuous application always working to a wet edge and in the same direction to ensure consistency of finish. Wherever possible, entire elevations should be completed in a single operation to avoid joint marks in the finish. This can often be achieved by working to natural breaks in the building or working to breaks in colour or texture.
Do not apply Wetherby Silicone Textured Finish with differing batch numbers on the same elevation. Care should be taken to avoid texture changes at different levels. Prior to setting, polish render with plastic float to give an even texture and remove all trowel marks. WBS 7–25 mm brick slips.Guidance for specification option: WBS Brick Slips should be cleaned before application ensuring all slips are free of residue. Whilst the brick slip adhesive is wet the brick slips can be firmly pushed into the adhesive. Brick slips should be installed line and level and staggered leaving a consistent joint.
NB. Brick slips are manufactured using raw natural ceramics and will inevitably vary in nature. Natural variations in colour, texture and dimensions may be present. It is advisable to mix slips from at least 5 boxes to minimize grouping of colours. Any product deemed faulty or out of tolerance should not be applied and should be reported to Wetherby immediately. WBS pointing mortar.Guidance for specification option: Once brick slips have set, point up with WBS Pointing Mortar using a pointing gun. Shape mortar to desired joint type using a pointing trowel. Care should be taken not to apply WBS Pointing Mortar onto the brick slip face or pistols as this can be very difficult to remove. Once pointing mortar is dry, brush down the wall to remove all loose mortar etc. |
Colour | Guidance for specification option: Insert requirements:
|
Protective coating | Aspira render protector.Guidance for specification option: Apply Wetherby Aspira render protector with a roller ensuring a full and even coverage, covering 100% of the substrate. The substrate must be fully dry and clean before application; ensuring morning dew is not present on the substrate. Cross hatch application is recommended to ensure all areas are fully treated. Do not dilute product and protect from rain for a minimum 12 hours after application to allow coating to fully dry. Not required. |
System accessories | WBS sealing tape.Guidance for specification option: Pre-compressed, expanding waterproof sealing tape. WBS firtree fixings.WBS jointing pieces.WBS end caps.WBS EVO-STIK silicone sealant.WBS APU bead. |
Samples required | Submit samples of Wetherby Silicone Render / Brick Slips for approval. Keep approved samples on site for the duration of the contract for inspection and comparison purposes. The manufacturer offers a product sample service, providing a small sample of the finished build-up, colour and brick slip type before a final decision is made. Contact the manufacturer for further information. |
Execution | Install system as per manufacturer’s instructions. |
System completion | Inspection of completed installation.Documentation for insulated render systems.O&M manuals and data sheets relevant to the system installed. |
Sustainability data
Contains Red List materials | No |
Country of material origin | Europe |
Country of product manufacture | Europe |