EWI carrying round internal corner
Detail summary
Standard detail for external woodfibre wall insulation system carrying round an internal corner.
Target Values:
Psi Value: -0.1977 W/mK
Technical description
Plan detail. EWI to internal corner with external perpendicular wall. Continuous insulation around corner to prevent thermal bridging with butted joints between insulation and continuous render over.
Suggested Installation sequence:
- Cut back rigid board on A to enable perpendicular board to be fixed.
- Fix insulation boarding A to existing wall.
- Cut back rigid board on board B and fix to butt.
- Stuff any gaps with woodfibre off-cuts.
Render.
Installation: by system manufacturer, or a contractor approved by the system manufacturer.
Integrity:- Weathertight under all anticipated conditions.
- Capable of resisting all dead loads and design live loads, including impact and wind loads, and accommodating all thermal movements without damage.
Render
Materials/ Surfaces: Do not use frozen materials and do not apply materials to frost bound surfaces.
Adhesives/ Mortars/ Renders: Do not apply when air temperature is at or below 5 °C on a falling thermometer or below 3 °C on a rising thermometer, or when temperature of the air or wall surface is above 30 °C and the surface is not protected. Temperature of the work: Maintained above minimum level recommended by manufacturer until adhesive/ mortar/ render has fully hardened.
Newly rendered surfaces: Protected against rain and snow by covering when precipitation occurs. Coatings damaged by rain or frost: Replace.
Notes
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/substrate: Before work- remove any existing loose material from external wall and prepare in accordance with manufacturer's requirements. Substrate to be structurally sound, adequately true and level, dry, free from contamination by dirt, dust, efflorescence or other deleterious substances, and in a suitable condition to receive specified coatings.
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.
Existing Services
Gas Meters and Inlets: Gas meters and inlets to be left in-situ. Insulation to be fitted round them as closely as possible, whilst ensuring they are still properly ventilated. Care should be taken when excavating close to gas mains.
Soil Pipes: An assessment of the condition of soil pipes should be undertaken prior to external wall insulation being undertaken. Assume soil pipes will remain in situ unless agreed in by contract administrator. However in some cases pipes may need to be replaced/ moved. Any changes to existing pipework to be agreed in writing by the contract administrator before work starts.
Rainwater Pipes and Waste Water Drainage: Rainwater pipes and waste water pipes will be moved to the outer face of insulation as standard, and swan-necked back into gulleys where possible. Any work additional to this should be agreed in writing with the contract administrator.
Windows and doors: Where windows and doors are to be replaced in insulation please refer to contract/window schedules for details. Where windows and doors are to be retained in insulation please refer to relevant detail drawings to show reveal insulation and cills.
Parts list
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External Wall Insulation (Woodfibre), 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.
- 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/
Revisions
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Admin - 2015-04-29 13:42:24 [Displayed version]
DWG file uploaded. EW01 parts list contact information added.
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Admin - 2015-03-27 16:40:17
Preview image and .pdf file updated.
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Admin - 2015-03-24 14:45:54
General reformatting. Links added to parts list suppliers.
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Admin - 2015-03-13 13:02:30
Title, intro, technical description updated. Parts list added.
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Admin - 2015-02-27 17:11:15
Version 1
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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
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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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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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