External wall insulation (EWI) involves applying insulation, reinforcement layers, and render to the exterior of a building. It provides efficient thermal insulation for new and existing buildings, conserving energy by minimizing heat loss. EWI creates a "warm wall" that eliminates interstitial condensation risks while high performance water shedding render finishes protect the building fabric. The system uses various components like insulation boards, adhesive renders, mesh cloths and finishes to thermally insulate, reinforce and decorate the exterior of structures.

1. Render Protected
External Wall Insulation
(EWI)
Breakfast Briefing
Thursday 29th October 2015

2. What is EWI?
Thermally insulated, protective and
decorative exterior cladding
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Beads and closures
Insulation
Fixings
Reinforcement layer
Base render coat
Finish coat

3. EWI –
Where is it used?
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New Residential
Clancy Quay Residential
Development, Dublin
Remodelling
Buildings
Orwell Road, Dublin
Commercial New
Build
Pipers Hill Secondary
School, Naas
Social Housing
Refurbishment
Knocknaheeny Estate, Cork

4. Benefits of EWI
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Provides efficient thermal insulation for
refurbishment and new build projects
Conserves energy
Minimises heat loss
Eliminates interstitial condensation by
creating a 'warm wall' construction
High performance water shedding range of
finishes to protect the building fabric
Comprehensive range of colours and
textures enable the creation of striking
visual effects

5. Construction Overview - Single Skin
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T
T
D
D
D
T
D
T T
T
D
D
No Insulation Internal Wall Insulation External Wall Insulation
-5o
21o 21o
21o-5o
-5o
Reproduced from: DEFRA/DTLR (Department of Environment, Food and Rural Affairs/ Department of Transport
Local Government and the Regions); Limiting thermal bridging and air leakage; Robust construction details for
dwellings and similar buildings. Please note that this is a UK standard which may be used for guidance but is
not a requirement in Ireland.

6. System Components
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Insulation
Flexible adhesive render
Fibre glass mesh cloth
3-4 mm average thickness
6-12 mm maximum thickness
Achieves all categories of
Impact in accordance with
ETAG 004 (additional mesh)
Polymer Render Systems
using a mesh cloth (thin-coat system)

7. 7
System Components
Render Brick Systems
Insulation
Used in difficult climatic
Conditions
Ability to match existing finishes
Lightweight adhesive render
Fibre glass mesh cloth
3-4 mm average thickness
6-12 mm maximum thickness
7-8mm RBB render basecoat
2-3mm RBF render facecoat

8. System Components
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Insulation
Hand or machine applied render
In two passes 14-15mm scraped
back to 12 mm thickness for
mesh
First pass: through coloured
render, with mesh
reinforcement
Second pass: through coloured
render, scrape finish
One-Coat System
Category 1 Impact
Incorporates Algaecide
Ingredient

9. System Components - Finishes used with Insulated Render
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Light synthetic aggregate
using an acrylic binder
brick-effect render
Mineral render
scraped texture
Dry dash
using 6-8mm
coloured aggregate
Spray roughcast

10. System Components – Performance Coatings
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High Performance Finishes
weber.sil P - silicone resin mineral paint
weber.sil TF - silicone-based textured finish
• Highly hydrophobic finishes provide high
water repellency
• Less risk of dirt on surface resulting in a low
maintenance facade
• Low susceptibility to soiling, algae and fungi
growth - façades stay new looking for longer
• Highly vapour permeable
• UV stable and resistant to acid rain
(independently tested)
• Resistant to blistering and peeling
• Low VOC content
• Available in over 250 colours

11. Technical Advice – Generic Details
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12. Technical Advice – Generic Details
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13. Technical Advice – Generic Details
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14. Technical Advice – Generic Details
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15. Benefits of Render
Protected External Wall Insulation (EWI)
Summary
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Enables thermal management of buildings
Maintains a dry, stable structure
Removes the risk of condensation
Contributes to the reduction of CO² emissions
Provides beneficial whole life costs
Creates simplicity in design
Combines aesthetics with durability
Reduces building maintenance

16. 17
Thank you for attending, any
questions?