EWI to clipped eaves with hidden gutter [Version ID #160]
Detail summary
A detail for External Wall Insulation, designed to deal with potential cold bridge at eaves - where new or existing loft or roof insulation meets external wall insulation. Where there is a limited overhang at the existing eaves, an integral gutter is required to enable water run-off. Here the EWI is brought up to form a verge, which is then capped with a Stainless steel gutter.
Technical description
Section detail. EWI to existing wall. Up to eaves, clipped, with new/ existing loft insulation join to EWI.
All guttering to BS EN 12056-3, clauses 3–7 and National Annexes. Collection and distribution of rainwater: Complete, and without leakage or noise nuisance. Reference should be made to Approved Document H (drainage and waste disposal) and Document F (ventilation)
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
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External Wall Insulation (Woodfibre), rendered finish [EW01]
For use on solid and hard to treat cavity walls. Composite woodfibre board. UdiTherm SK back board, Diffutherm NF (T&G, renderable) top board. \ Fixed mechanically to substrate in accordance with manufacturers recommendations. \ 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. \ Thermal conductivity: 0.045W/m2K. GWP 0.
Unger \ www.unger-diffutherm.de \ Reference: UdiFRONT. \ Render: UDI Perl
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Eaves Vent strip/ Protected ventilation path [RF06c]
Sheeting to allow continuous ventilation gap below tiles/ ventilator strip to allow airflow under roof whilst preventing ingress of insects and small birds.
Contractors choice
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Breathable Membrane/ Roof Underlay [RF06c]
Sealed to phenolic foam insulation and dressed to drainage point at the end of each run of guttering to allow water to exit construction.
Green Building Store \ http://www.greenbuildingstore.co.uk \ Reference: Solite x UM
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Single piece stainless steel box gutter [RF06g]
Flashing at junction between flat roof verge and external wall insulation. To BS 460, and BS EN 12056-3, clauses 3–7 and National Annexes. \ Profile as drawing. \ Size as per drawing- to suit existing roof dimensions and cover depth of external wall insulation. Ensure provides adequate capacity for rainwater discharge from roof. \ Thickness 1.2mm. \ Joins to be avoided where possible. If required must be fully welded and tested. Could be glued and blind riveted subject to approval. \ Self finished Stainless steel grade 304. \ Setting out: to falls. \ Welded stop ends required. \ Fixed as manufacturers recommendations. \ Test on completion.
Contractors choice
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Insulation to Eaves (rigid) [RF06c]
Phenolic Foam. / Thermal conductivity: 0.023W/m2k. / Thickness: 50mm. / Width: cut to suit rafters. / Installation: Continuous with roof insulation, no gaps, to avoid cold bridging. Friction fit between rafters.
Contractors choice
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Insulation to Eaves (Flexible) [RF06c]
Woodfibre offcuts from external wall insulation. Insert into gaps between wall plate/top of wall and rigid insulation to ensure continuity and avoid air movement.
Unger \ www.unger-diffutherm.de \ Reference: Diffutherm
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Softwood battens (for replacing existing slating) [RF06c]
50x25mm timber battens. Fully factory Pre-graded. \ All timber to be FSC certified \ Preservative treatment required. \ Fastening: Galvanized steel nails, sized to penetrate 40 mm (minimum) into rafters.
Contractors choice.
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Double/Single-sided air seal tape [DP09b/a]
Tape for junctions critical to air-tightness. 60mm (typical). \ Accessories: ORCON F sealant and TESCON PRIMER RP (for use on rough/old surfaces to assist adhesion)
Pro Clima \ http://www.greenbuildingstore.co.uk/page--pro-clima-airtightness-tapes-options.html \ TESCON VANA/ TESCON PROFIL (single sided) \ Contega L (double sided)
Revisions
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Admin - 2015-11-03 16:30:31
Edited the notes
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Admin - 2015-04-29 09:17:25
DWG file updated. Back to earth contact details added for EWI. Formatting changes to Parts list
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Admin - 2015-03-27 16:12:16
Preview image and .pdf file updated.
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Admin - 2015-03-27 11:19:19
Parts list updated so concurrent with detail drawing. DP03 added to parts list.
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Admin - 2015-03-27 11:14:12
Parts list updated so concurrent with detail drawing. DP03 added to parts list.
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Admin - 2015-03-23 16:01:08
General formatting and error reduction.
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Admin - 2015-03-23 15:02:23
Parts list updated- loft insulation added. General formatting and error removal.
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Admin - 2015-03-23 12:01:43
Introduction/summary updated. Technical description revised and updated with British Standards and Approved docs. Links added. Parts list updated: reformatted and links added.
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Admin - 2015-03-23 11:59:19
Introduction/summary updated. Technical description revised and updated with British Standards and Approved docs. Links added. Parts list updated: reformatted and links added.
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Admin - 2015-03-23 11:58:52
Introduction/summary updated. Technical description revised and updated with British Standards and Approved docs. Links added. Parts list updated: reformatted and links added.
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Admin - 2015-03-13 18:00:06
Updated with additional titles and codes. Installation sequence added.
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Admin - 2015-03-12 12:10:40 [Displayed version]
Version 6- Title, description and technical description updated and expanded. BS and Approved doc information added. Parts list added.
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Admin - 2015-03-03 11:26:17
Preview file updated
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Admin - 2015-02-27 12:48:00
Preview image updated
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Admin - 2015-02-27 12:47:23
Preview image updated
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Admin - 2015-02-27 12:14:52
version 2- .dwg file updated
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Admin - 2015-02-26 14:15:27
First version
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For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
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User name
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
-
User name
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
Feedback summary
- 80% of users found this detail easy to implement.
- 50% of users found it easy to source skills for this detail.
- 60% of users found this detail hard to understand.
- 100% of users found the overall cost for this detail to be low.
- 90% of users found materials for this detail easy to source.
Discussion
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
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