EWI to New Door with Brick Nib- Retrofitted

Author details

Original Author:Admin Organisation:Retrofit Pattern Book

Detail summary

Detail for external wall insulation to jamb of a new door, installed or retrofitted into an existing wall with a single brick nib; (detail presumes the new door fixed in place on the internal face of the brick). To prevent potential cold bridging at the existing opening, insulated external wall board is proposed over the existing wall to the door reveal.

Technical description

Plan detail. EWI junction with new door inset into threshold with brick nib.

Reference Specification

For guidance on step access and width for doors: Please refer to Approved document M (access and use of buildings).

Based on specifications of door: Door facings:

  • Laminate: to BS EN 438-1 and -7.
  • Plywood: To BS EN 314, surface appearance to BS EN 636.
  • Hardwood: To BS EN 635-2.
  • Softwood: To BS EN 635-3.

External wood matchboarded doors to BS 459.
Wood framed panel doors:
Timber quality: To BS EN 942.
All adhesives for for wood doors and frames:

  • to BS EN 204 for Polyvinyl acetate (PVAC).
  • To BS EN 12765, class C4 for thermosetting resin.

Fire performance of all doors, Fire resistant doorsets and shutter assemblies:

  • Type testing: To BS 476-22 or BS EN 1634-1.

Smoke control doorsets and shutter assemblies:

  • Type testing: To BS 476-31.1 or BS EN 1634-3.

Intumescent seals:

  • Type testing: To BS 476-23.

Testing authorities to be UKAS accredited.

Single leaf external doorsets to dwellings, security: To BS 8220-1: General to BSI publication PAS 23-1, Specific req. to BSI publication PAS 24.

Safety glazing to door leaves and sidelights to BS 6206 for safety plastics and BS EN 12600 for safety glass. Location: To BS 6262-4.

Perimeter insulation suitable for below ground use and drainage layer. To BS EN 13164

For any new or existing brick/blockwork where not re-used: Aggregate concrete bricks and blocks: To BS EN 771-3. Autoclaved aerated concrete (AAC) blocks: To BS EN 771-4. Calcium silicate bricks: To BS EN 771-2. Clay blocks: To BS EN 771-1.

Cement: To BS EN 197-1 and CE marked.


Care should be taken to ensure air-tightness. Seal all service penetrations through EWI and existing wall. Lap and tape all membranes around edges of EWI system.

All insulation to be continuous to avoid thermal bridging.

Preparation of external wall: Remove any existing loose material and prepare in accordance with manufacturer's requirements.

Any alterations to drainage and other fixtures, or work to prepare the substrate, to be agreed with contract administrator prior to work being undertaken. Prior to start on site inspect the form and condition of the structural substrate; institute repairs and/ or additional works necessary to make the substrate suitable to receive EWI system.

Parts list

  • EWI (Woodfibre), with rendered finish [EW01]

    Composite woodfibre board for use on solid and hard to treat cavity walls.

    • Insulation back board: UdiTherm SK.
    • Insulation top board: Diffutherm NF (T&G, renderable).
    • Thermal conductivity: 0.045W/m2K. GWP 0.
    • Base Coat: levelling on substrate: 90% contact required around edge of boards between board and substrate to prevent thermal bypass. If substrate is very uneven, use base-coat material around edge of board to achieve contact.
    • Fixing: Fixed mechanically to substrate in accordance with manufacturers recommendations.
    • Render/carrier: to manufacturers standard.
    • Beads/trims to Manufacturers standards.
    • Render: Udi Perl
    • Decorative finish: tbc
    • System guarantee: 25 years - ECO compliant insurances and guarantees.
    • System Certification : ETAG

    Unger-Diffutherm. Product Reference: UdiFRONT.
    Supplied by: Back To Earth. Tel: 01392 861763
    Web: http://www.backtoearth.co.uk/

  • EWI (Woodfibre) accessories [EW01]

    • Render edging strip to external corners for render support.
    • Adhesive render edging strip for airtight seal around doors

    As EWI manufacturers' recommendations

  • External Wall insulation board [EW05]

    External wall board- thin profile.

    • Insulation thickness: 20mm.
    • Thermal conductivity: 0.023W/mK
    • Finish: render as adjacent EWI.
    • Render stops/corner beading: Render stop required at junction with door head/jamb. Manufacturer's standard.

    Kingspan Insulation Ltd.
    Product Reference: Kooltherm® K5 External Wall Board.

  • New Insulated External Wood Flush Doorset [GD14]

    Enhanced EcoHomes Doorset.

    • Type: 54mm insulated single leaf door.
    • Target U-value : 1.0 W/m2K
    • Air-tight installation : Install to achieve maximum air-tightness, using appropriate air-tight tape and sealants at all junctions and potential air-leakage points. (expanding PU foam will not be sufficient to achieve adequate air-tightness).
    • Size: As existing.
    • Facings : Manufacturer's standard.
    • Glazing : Factory glazed as required.
    • Finish As Delivered : Factory finished paint system.
    • Ironmongery : Manufacturer's standard, factory fitted.
    • Threshold : Hardwood with mobility threshold seal.
    • Frame : Manufacturer's standard.
    • Handing : As existing.
    • Doorset Fixing : As manufacturer's recommendations.
    • Certification : All timber to be FSC certified.
    • Security : Secured by Design

    Performance Door solutions
    Contact: Tel: 01706 370001.
    Email: http://info@pdsdoorsets.co.uk.
    Product Reference: Enhanced EcoHomes Doorset

  • New Insulated External Wood Flush Doorset [GD14a]

    Ecocontract Entrance Doorset.

    • Size: as existing opening unless otherwise.
    • Door & frame material: FSC 100% redwood.
    • Door & frame drip rail: aluminium.
    • Finishes: internal and external: TBC by contract administrator
    • Glazing : Triple, as standard.
    • Handle colour: TBC by contract administrator.
    • Hardware: As standard.

    Green Building store.
    Product Reference: Ecocontract Entrance Doorset.

  • Softwood timber packers

    As required to build up door reveal to edge of brickwork, internally against brick nib. Size to be confirmed on site.

    Contractors choice


  1. Admin - 2015-04-29 10:43:26 [Displayed version]

    DWG uploaded. General format changes.Title amendments for GD14. Back to Earth contact detail added to EW01.

  2. Admin - 2015-04-29 10:42:47

    DWG uploaded. General format changes.Title amendments for GD14. Back to Earth contact detail added to EW01.

  3. Admin - 2015-04-22 14:17:39

    Pdf file updated to most recent version

  4. Admin - 2015-03-27 16:08:50

    Preview image and .pdf file updated.

  5. Admin - 2015-03-25 13:01:15

    Amendment to parts list- Thin phenolic insulation.

  6. Admin - 2015-03-23 15:59:14

    Technical description - general reformatting.

  7. Admin - 2015-03-18 12:47:30

    Version 2- Introduction expanded. Technical description revised and expanded with BS codes/standards and approved docs. Parts list added with codes and relevant suppliers/manufacturers links.

  8. Admin - 2015-02-27 12:23:46

    Version 2- .dwg file updated

  9. Admin - 2015-02-26 17:17:25

    First Version

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