EWI to clipped eaves with room in roof (insulation to rafters) [Version ID #228]
Detail summary
A detail for External Wall Insulation, designed to deal with potential cold bridge at eaves - where new insulation to rafters meets external wall insulation. Where there is a limited overhang at the existing eaves, an integral gutter is required to enable water run-off. The EWI is used 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.
SUGGESTED INSTALLATION SEQUENCE:
1.) Lift and remove bottom rows of tiles. 2.) Roll back existing bitumen roofing membrane. 3.) Inset eaves insulation - FAB RF06 .4.) Fix external wall insulation - cut to fit to eaves insulation and cut back to form gutter parapet - FAB EW01 .5.) Re-fix tiles. 6.) Install loft insulation - FAB RF01 - making sure it meets the back of the eaves insulation - FAB RF06
REFERENCE SPECIFICATION:
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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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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Stainless steel gutter [RF06g]
Flashing at junction between flat roof verge and external wall insulation. Profile as drawing. 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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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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Insulation Boards Or Batts Fitted Between Rafters [RF02a]
Formaldehyde Free Glass mineral wool semi rigid batts friction fitted between rafters. / Thermal Conductivity: 0.032W/mK / GWP : 0 / Thickness: 35 mm less than rafter depth. / Width: To suit rafter spacing.
Knauf. / www.knaufinsulation.co.uk / Reference: DriTherm Cavity Slabs.
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Integral vapour control with Insulated Dry-Lining Board [RF02a]
Type: Phenolic foam backed plasterboard. / Thermal Conductivity : 0.020W/mK. / GWP : <5. / Insulation thickness: As required to meet target U-value (80mm where 35-75mm mineral wool insulation, 60mm where 75-100mm mineral wool insulation, 50mm where 100mm + mineral wool insulation). / Thickness: 12.5mm. / Vapour Control: Integral Vapour Control Layer - ensure all joints between sheets detailed and taped to minimise vapour transmission using vapour-tight tape.
Kingspan Insulation Ltd. / www.kingspaninsulation.co.uk / Reference: Kooltherm® K18 Insulated Plasterboard.
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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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Ventilation path from loft space (for HR membranes)[RF06c]
Polycarbonate sheeting - equivalent to 10mm continuous ventilation gap
Contractors choice
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Eaves Vent strip [RF06c]
Ventilator strip to allow airflow under roof whilst preventing ingress of insects and small birds.
Contractors choice
Revisions
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Admin - 2015-04-29 09:29:02
DWG file updated. Contact details updated for EWI to include Back To Earth. Formatting changes.
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Admin - 2015-04-29 09:26:58
DWG file updated. Contact details updated for EWI to include Back To Earth. Formatting changes.
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Admin - 2015-03-27 16:17:15
Preview image and .pdf file updated.
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Admin - 2015-03-23 13:03:26
Introduction expanded with target u-values. Technical description updated with more detailed construction sequence and BS/approved doc links. Parts list updated with links/codes. General re-formatting.
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Admin - 2015-03-23 12:58:32
Introduction expanded with target u-values. Technical description updated with more detailed construction sequence and BS/approved doc links. Parts list updated with links/codes. General re-formatting.
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Admin - 2015-03-13 18:02:12 [Displayed version]
Technical description updated with installation sequence.
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Admin - 2015-03-12 12:44:18
Version 7- Title, description and technical description updated and expanded. BS and Approved doc information added. Parts list updated.
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Admin - 2015-03-12 12:43:01
Version 7- Title, description and technical description updated and expanded. BS and Approved doc information added. Parts list updated.
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Admin - 2015-03-03 12:02:55
Parts list updated
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Admin - 2015-03-03 11:57:19
Parts list updated
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Admin - 2015-03-03 11:42:18
Preview file updated. Parts list added.
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Admin - 2015-02-27 12:16:13
Version 2- .dwg file updated
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Admin - 2015-02-26 14:34:32
Second version - Change to summary text.
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Admin - 2015-02-26 14:32:04
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
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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
Feedback summary
- 80% of users found this detail easy to implement.
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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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