REW07 – Retro Ecowall to Diasen EWI System Junction – Plan
Price range: £9.00 through £14.00 + VAT
This plan detail shows the junction at a wall corner where the internal Retro Ecowall system meets a Diasen external wall insulation (EWI) system on the outer face of the same wall, applied to a 215mm solid brick wall.
A minimum 1000mm return of the Retro Ecowall system is required at the junction. The primary detail shows the system returned along the externally insulated wall with a reduced thickness of 20mm Gutex Thermoroom boards; an alternative detail shows a 40mm return board thickness with 15mm existing lime plaster retained in lieu of insulating plaster. An option to extend the Retro Ecowall system for the full length of the wall to avoid creating a step is also indicated. The external EWI system comprises 60mm Diasen Diathonite Evolution lime and cork insulating plaster in two layers with Diasen Polites 140 reinforcing mesh, a 3mm Diasen Argatherm breathable lime-based finishing plaster with Diasen Polites 80 mesh, and Diasen D20 primer followed by breathable exterior paint.
See drawing notes for full information.
Features of this detail: retrofit, IWI, internal wall insulation, vapour open build-up, breathable, masonry wall, solid wall, lime render, cork insulation, insulating plaster, wood fibre insulation, wall corner, EWI junction, external wall insulation
This Detail Features
Ecological Building Systems
Ecological Building Systems support the construction sector in the creation of a better built environment through the supply of innovative, sustainable, ecological building materials and solutions and deliver quality, affordable products and training.
Many of the products featured in this detail are available from Ecological Building Systems, and Ecological are on hand to provide expert technical advice when specifying and designing high performance buildings in terms of airtightness, windtightness and high levels of insulation.
Featured Products
Gutex, based in Germany, is a fourth generation family run company and leading manufacturer of woodfibre insulation boards. Gutex was the first in Europe to manufacture insulation boards from ecological wood fibre, incredibly this was in 1932. Testament to Gutex's continuous innovation philosophy, they became the first manufacture to produce single-ply homogeneous wood fibreboard insulation using a low-energy dry process which allowed the production of thicker higher quality boards, providing superior thermal storage capacity.
Diathonite Thermactive is a breathable lime and cork-based insulating plaster designed for internal solid masonry walls and ceilings. It improves thermal performance while allowing moisture to move naturally through the wall, helping to reduce condensation and maintain a healthier indoor environment, making it particularly well suited to older, solid-wall and retrofit properties.
Lime Green Solo is a breathable, one-coat lime finishing plaster for internal walls and ceilings, designed to provide a smooth, durable finish over masonry, lime plasters and wood fibre insulation boards. Made from natural lime-based materials and free from cement, it helps regulate moisture, reduces the risk of condensation and mould, and is particularly well suited to the renovation and retrofit of older, solid-wall buildings where breathability is essential.
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