House Coetzer, Eye of Africa
Residential

House Coetzer, Eye of Africa

Eye of Africa Estate
A private house where the rendered wall planes are their own weather skin, texture and colour — a few millimetres of Terraco on bonded and dowelled EPS board, on planes flat and long enough to show up any mistake.
SystemTerraco EIFS — a Terraco topcoat over a polymer-modified basecoat with alkali-resistant glass-fibre mesh, on EPS board that is adhesive-bonded and mechanically dowelled. The dowels are photographed; the adhesive, and the brand names of the basecoat and the mesh, come from Technopol's record of the job and not from any frame
Finish recorded on this house"TTC Excel Sil 2mm clear", colour "TX 138-6 [+ 1 gram B7-SO]" — as written on the Terraco sample card kept with the job (ref. TC 0146F, issued 18 September 2017, signed and dated 29/09/17; the "Accepted:" line is blank). The card records one colour; the elevations carry two
Adhesion / pull-off bond strength (declared product value)>2.0 N/mm² — a product declaration. No pull-off test was carried out on this facade
Water (declared product values)W24 <0.15 kg/m²·h^0.5 liquid-water uptake; vapour-permeable at Sd <0.10 m — product declarations. Neither was measured on this house
Thermal duty of the renderNone. The coating is the finish and the weather skin; λ, R and U belong to the EPS board behind it
Not render on this houseA stacked-stone band takes the bottom of the two-storey elevation and clads the entrance block. The EIFS is the wall finish, not the whole external finish

House Coetzer, number 1976 at Eye of Africa Estate, is a double-storey flat-roofed house of the unforgiving kind: long uninterrupted wall planes, deep charcoal parapet and fascia bands, big aluminium-framed glazing, and external corners that turn at a hard arris with nothing to hide behind. There is no eaves shadow, no coursing, no relief. The wall is one flat field bounded by a straight line, and raking sun crosses it every morning. Technopol supplied and applied a Terraco EIFS facade: EPS insulation board fixed to the structure — bonded and mechanically dowelled, both, not one or the other, per Technopol's record of the job; the dowels are in the photographs below, the adhesive bed is not — then a polymer-modified basecoat with alkali-resistant glass-fibre mesh embedded in it, then the decorative topcoat. The basecoat and the mesh are plainly there in the frames. Nothing in the album names either product, so neither is named here. The one product record kept on the job is a Terraco sample card, ref. TC 0146F, issued 18 September 2017: Product "TTC Excel Sil 2mm clear", Colour "TX 138-6 [+ 1 gram B7-SO]", signed and dated at the foot. That card is the last photograph below. Its "Accepted:" line was left blank, so what it carries is a signed product-and-colour record and not an approval — and that record is still the reason the finish on this building is traceable to a card rather than to a screen. It covers one colour; the elevations carry two, the pale field and the charcoal bands. The render carries no thermal duty. Every R-value in this wall belongs to the board behind it; the coating's job is narrower and, on a house like this, harder. It has to be the weather barrier — the product is declared at W24 below 0.15 kg/m²·h^0.5 for liquid-water uptake while staying vapour-open at Sd below 0.10 m — it has to stay stuck, at a declared pull-off bond above 2.0 N/mm², and it has to be the finished surface: no paint job afterwards to bail it out. Those three numbers are product declarations. Nothing on this facade was tested for any of them. What the site record shows is how the system was built at the awkward places. The mesh is visible in the basecoat where the topcoat stops at the parapet cap, and the render is carried over the top of the parapet and down its face as one skin, turned at a square arris sharp enough to throw a hard shadow. The boards are dowelled through with their heads countersunk into shallow recesses in the board face, set to be buried by the basecoat. And across a full two-storey elevation in flat overhead sun, neither the board joints nor the dowel heads telegraph through the finished plane — which is the only test of this system that a photograph can actually settle. The frame at the top of the page is the same house from the driveway with the sun low behind the trees, and at that distance it will not settle anything.

On this building
Product
EIFS/ETICS External Wall Insulation
On site

The photographs

Ours, taken on the job. Not renders.

A full two-storey elevation, the file stamped 27/10/2023 11:37 with the sun near overhead. The pale textured finish runs unbroken across both floors and around the blade wall carrying the 1976 numerals, and no board joints or dowel heads show through it. A dark stacked-stone plinth runs along the base of the ground floor.PHOTO
A full two-storey elevation, the file stamped 27/10/2023 11:37 with the sun near overhead. The pale textured finish runs unbroken across both floors and around the blade wall carrying the 1976 numerals, and no board joints or dowel heads show through it. A dark stacked-stone plinth runs along the base of the ground floor.
Two rendered wall planes meeting in the corner of the roof deck, beneath a projecting charcoal band that turns the corner as one continuous element. On the right the render turns an external corner as a square arris with no bead line breaking the texture.PHOTO
Two rendered wall planes meeting in the corner of the roof deck, beneath a projecting charcoal band that turns the corner as one continuous element. On the right the render turns an external corner as a square arris with no bead line breaking the texture.
The fixing, photographed where the render has been taken off. Insulation dowels with plastic plates and red steel pins sit in shallow recesses cut into the EPS board face, so the heads fall below the board line. A horizontal board joint crosses the frame, with a small patch of yellowed filler let into the board beside it.PHOTO
The fixing, photographed where the render has been taken off. Insulation dowels with plastic plates and red steel pins sit in shallow recesses cut into the EPS board face, so the heads fall below the board line. A horizontal board joint crosses the frame, with a small patch of yellowed filler let into the board beside it.

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