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Wetherby Epsitec EPS Dash System - EPS Insulation With Dash Finish

Verified by manufacturer over a year ago

Enhanced EPS 70E

Wetherby Building Systems Ltd Variant:
Third party certifications:
  • KIWA BDA

    KIWA BDA

    Certificate type

A framed KIWA BDA certified external thermal insulation composite system consisting of an enhanced EPS insulation board, base-coated, meshed, finished off with dash receiver and dashing stone finish.

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BOS
 +44 (0)1942 717100 Website

Application

Suitable for use on the outside of steel or timber frame walls of new or existing domestic and non-domestic buildings, with height and boundary restrictions (see systems KIWA certificate for further information).

Description

A KIWA BDA certified external thermal insulation composite system consisting of either vertical timber battens or cavity spacer rails, enhanced EPS insulation board, base-coated, meshed, finished with dash receiver and dashing stone finish.


Features and benefits:

  • Moisture control contribute to limiting the risk of interstitial and surface condensation.
  • Will resist wind-driven rain penetration across the partially ventilated cavity to the supporting wall.
  • Designed to adequately resist impact damage and wind loads normally encountered in the UK.
  • Classified as European class B-s1, d0 in accordance with BS EN 13501-1.
  • Improves the thermal performance of external walls and can contribute to satisfying the requirements of the National Building Regulations.
  • Service life durability of the System will depend on the environment (operating conditions) in which the System will be used.


Preparation:

  • All 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 RagRails can be installed flush to the substrate.
  • Slight variances in the substrate can be overcome by using suitable packers to ensure the system is installed line and level.
  • 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.
  • Where packing out of the RagRail or Timber Batten is required, the fixing lengths may need to be increased. This will need to be confirmed on site prior to the installation of the Wetherby system.
  • All sheathing boards must be securely fixed, correctly jointed and sealed (where required) as per the board manufacturer instructions.
  • Treatment to Existing Timber/ Steel Cladding – 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.

General information

Color

Grey

White

Other

Guidance for specification option:

Various colours available for WBS Dry Dash Aggregate.

Finish

Coarse

Guidance for specification option:

The System is finished with scrim adhesive, alkali resistant scrim cloth, dash receiver and dry dash aggregate.

Material

Expanded polystyrene (EPS)

Guidance for specification option:

Insulation boards.

Aluminium

Guidance for specification option:

Base rail.

Timber

Guidance for specification option:

Spacer support battens/ rails.

Stone

Guidance for specification option:

Aggregate stone.

Steel

Guidance for specification option:

Galvanized steel rails.

Shape

Rectangle

Square

Length

Bespoke

Width

Bespoke

Height

Bespoke

Warranty description

Ten year

Uniclass

Ss_25_45_72_70 Rail-fixed external wall insulation systemsPrimary

CAWS

M21/20 External wall insulation system . . . . . .

M21/210 External wall insulation system

Specification data - Rail-fixed 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 has adequate strength and is designed to adequately resist impact damage and wind loads encountered in the UK. 

System Tested to BS EN 13501-1.

Guidance for specification option:

Achieves a value of B-s1, d0 reaction to fire classification.

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.

Guidance for specification option:

For further information on the above points visit the system KIWA BDA Certificate.

Support rails and brackets

-

Material

15 mm RagRail Cavity Spacer Rails.

Guidance for specification option:

  • RagRails are to be fixed down one side of the rail and through the centre of the rail hitting the studs at 300 mm centres.
  • The above would all be subject to Job Specific Detailing, including Pull Out Tests and Wind Load Calculations.

25 mm RagRail Cavity Spacer Rails.

Guidance for specification option:

  • RagRails are to be fixed down one side of the rail and through the centre of the rail hitting the studs at 300 mm centres.
  • The above would all be subject to Job Specific Detailing, including Pull Out Tests and Wind Load Calculations.

25 mm Timber Battens.

Guidance for specification option:

  • Timber Battens are to be fixed at every 150 mm centres.
  • The above would all be subject to Job Specific Detailing, including Pull Out Tests and Wind Load Calculations.

Manufacturer guidance

  • The RagRails or Timber Battens help to create a drainage cavity between the Sheathed frame and External Wall Insulation. This cavity will then allow for any moisture located within these areas to track down and drain out, either from the bottom of the system or into specifically designed drainage boxes.
  • Rails or Timber Battens should be installed vertically at 600 mm centres and around windows ensuring the insulation boards are fully supported.

Bracket fixings

LS 5.5 (steel frame).

R-QCP (timber frame).

Manufacturer guidance

  • The actual fixings of the Rail/ Battens will need to appropriate for the substrate that the system will be installed over.
  • Fixings and the frequency of them will be subject to pull out tests and wind load calculations. 

Base boards

-

Material

Framed substrate sheathed using Wetherby approved sheathing board.

Guidance for specification option:

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.

Fixings

TKR Screw Range.

R-QCP Screw Range.

Manufacturer guidance

  • Fix boards in accordance with site conditions and manufacturers instructions.
  • The Enhanced EPS Boards are mechanically fixed with WBS approved fixings. These fixings must also be combined with a suitable Cap/ Washer.
  • The fixings frequency, type and length would be subject Pull-Out Tests and Wind Load Calculations

Insulation

-

Material

Enhanced EPS 70E.

Fixings

LS 5.5 (steel frame).

R-QCP (timber frame).

Manufacturer guidance

  • The actual fixings of the Rail/ Battens will need to appropriate for the substrate that the system will be installed over.
  • Fixings and the frequency of them will be subject to pull out tests and wind load calculations. 

Fire barriers and stops

-

Material

Stone Wool/ Horizontal Lamella Fire Barriers.

Guidance for specification option:

  • Required on all projects 2 storeys and above, as per BRE Report BR135:2013. Building Control would also need the confirm the positioning and the requirement of the fire barriers, cavity barriers and intumescent strips.
  • Mechanically fix fire breaks horizontally at agreed locations using stainless steel fixings and washers (as per Wetherby Detail Drawings).
  • Fire breaks must be fully supported by the cavity spacer rails/ timber battens to ensure stability.

Stone Wool/ Vertical Lamella Fire Barriers.

Guidance for specification option:

  • Required on all projects 2 storeys and above, as per BRE Report BR135:2013. Building Control would also need the confirm the positioning and the requirement of the fire barriers, cavity barriers and intumescent strips.
  • Mechanically and adhesively fix fire breaks vertically direct back to the sheathing board at agreed locations and at a rate of 4 stainless steel fixings per board minimum. 

Tenmat Intumescent Strip.

Guidance for specification option:

Required on all projects 2 storeys and above, as per BRE Report BR135:2013. Building Control would also need the confirm the positioning and the requirement of the fire barriers, cavity barriers and intumescent strips.

Fixings

TKE Range.

Guidance for specification option:

Typically used to fix fire barrier and intumescent strips to their agreed locations (Rail/ Sheathing Board/ Steel Frame).

Beads and trims

Not required.

Deflector beads.

Movement joints

-

Form with

WBS Powder Coated Galvanized Steel Movement Joint Bead.

WBS Powder Coated Galvanized Steel Stop Bead.

Manufacturer guidance

  • All structural movement joints must be mirrored through the EWI System. As a minimum, a render system should incorporate the movement joints every 7 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 and 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. 

Sealant

Compriband sealing tape must be installed between the insulation boards.

Render carrier or reinforcement

-

Material

WBS Alkali-resistant scrim cloth incorporated into scrim adhesive.

Mesh size

50 m² (roll).

Fixings

TKE Range – Steel Frame.

R-UCF Range – Timber Frame.

Manufacturer guidance

  • Secondary mechanical fixings are required on all projects 2 storeys and above at a rate of 1 per m² as per BRE Report BR135:2013.
  • NHBC require in all cases that a minimum of one non-combustible fixing is installed through the reinforcement mesh per insulation board, in addition to other fixings.
  • Install secondary fixings through the first pass of wet scrim adhesive and WBS Alkali Resistant Scrim Cloth. 100 x 100 mm scrim patches to be installed over each secondary fixing head.
  • In addition to this the Phenolic System will require further fixings through the mesh, a sharp knife will be required to make a small cut to the reinforcing mesh to allow the fixing head to be pushed through the mesh into the insulation before drilling the fixing into the substrate.
  • All fixing type, length and frequency subject to pull out tests and wind load calculations.
  • Finally scratch scrim adhesive horizontally in preparation for the Wetherby Dash Receiver finish coat.

Render

-

Material

WBS Polymer Cement Dashing Mortar.

Guidance for specification option:

  • Trowel apply one coat of WBS Polymer Cement Dashing Mortar in the traditional manner, at a thickness of 8–10 mm.
  • A darby or straight edged tool may be used to ensure a relatively uniform thickness, which can be smoothed out using a plastic float.
  • Complete individual surfaces in one operation where practical.

WBS Mineral Aggregate Spar Dash.

Guidance for specification option:

  • Whilst the freshly applied Dashing Mortar is still wet, dry dash the render surface in an upwards motion using clean Wetherby dashing grade mineral aggregates.
  • Ensure consistent application of the aggregate to leave an aesthetically pleasing finish. 

Decorative finish

-

Colour

-

Manufacturer guidance

Consult Wetherby Through Coloured Render & Spar Dash Systems document for further information and insert requirement.

System accessories

Not required.

WBS Sealing Tape: Pre-compressed, expanding waterproof sealing tape.

WBS Firtree Fixings.

WBS Jointing Pieces.

WBS End Caps.

WBS EVO-STIK Silicone Sealant.

WBS APU Bead.

Roof verge extenders.

Under and over cills.

Cill extenders.

End stop profiles.

Guidance for specification option:

Insert requirement: Available in stainless steel, PVC-U or organic polyester powder-coated galvanized steel.

Corner mesh profiles.

Guidance for specification option:

Insert requirement: Available in stainless steel, PVC-U or organic polyester powder-coated galvanized steel.

Expansion joint profiles.

Guidance for specification option:

Insert requirement: Available in stainless steel, PVC-U or organic polyester powder-coated galvanized steel.

Samples required

Approved samples required.

Guidance for specification option:

  • Submit samples of Wetherby Dash 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.

Guidance for specification option:

  • Securely fix Wetherby bellcast bead above DPC level at base of the system.
  • Mechanically fix bellcast bead at max. 300 mm centres, 50 mm from each end.
  • WBS 3756 base rail connectors should be used to join the tracks.
  • Drainage holes must be drilled into the back of the starter track to allow the cavity to drain.
  • Install 11 mm holes at 150 mm centres to allow for drainage and partial ventilation.
  • Any gaps behind the basetrack allowing free air movement behind the insulation should be sealed appropriately.

System completion

Inspection, documentation, O&M manuals and data sheets.

Guidance for specification option:

  • Inspection of completed installation.
  • Documentation for insulated render systems.
  • O&M manuals and data sheets relevant to the system installed.

Third-party certification

NHBC.

Dimensions

1200 x 600 mm.

Density

15 kg/m³.

CompressiveStrength

70 kN/m² (minimum).

Guidance for specification option:

At 10% deformation of EPS Insulation.

Manufacturer guidance

To BS EN 13163.

ThermalConductivity

0.032 W/m·K.

Guidance for specification option:

To BS EN 13163.

Reaction to fire classification

Class B-s1, d0 to BS EN 13501-1:2002.

SurfaceSpreadOfFlame

Flame Retardant Grade.

Environmental performance

CFC/ HCFC Free.

Ozone depletion potential (ODP)

Zero.

Global warming potential (GWP)

Less than 5.

Board thickness

50–240 mm.

Guidance for specification option:

Thicknesses compatible with the system certification range between 50–240 mm; insert requirement.

Sustainability data

Contains Red List materials

No

Material

Expanded polystyrene (EPS)

Guidance for specification option:

Insulation boards.

Aluminium

Guidance for specification option:

Base rail.

Timber

Guidance for specification option:

Spacer support battens/ rails.

Stone

Guidance for specification option:

Aggregate stone.

Steel

Guidance for specification option:

Galvanized steel rails.

BIM objects

BOS

NBS BIM Object Standard

This BIM object has been authored to meet the requirements of the NBS BIM Object Standard.

Find out more about the NBS BIM Object Standard.

Platform Compatible Version
Revit
 -

1

IFC
 -

1

Third party certifications

KIWA BDA

KIWA BDA

3043 BAW-20-177-S-A-UK - Wetherby Epsitec EPS Dash BDA Certificate

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