Continuous Insulation (EIFS)

What it must achieve

Performance targets

Requirement	Target	Standard	Note
External masonry wall — deemed-to-satisfy (no added insulation required)	Double-skin (cavity) masonry, OR a plastered single leaf ≥140 mm	SANS 10400-XA	Be honest about this: if the wall is cavity masonry or a plastered leaf of 140 mm or more, XA is already satisfied WITHOUT continuous insulation. Do not sell EIFS as a code requirement on those walls — sell it on comfort, thermal-bridge control, energy modelling (SANS 204 rational route), or because the wall is lightweight.
Lightweight / non-qualifying external wall — minimum TOTAL R	≥ 0.35 m²K/W	SANS 10400-XA	This is the real code driver for continuous insulation: LSF, panel and thin-leaf walls that are not deemed-to-satisfy. The 0.35 is a TOTAL assembly R (all layers + surface resistances), not the board R alone — and it is a low bar that a thin EPS layer clears easily.
Roof / ceiling minimum TOTAL R (for reference where the CI layer wraps up into the roof)	3.7 m²K/W in all zones (Zone 5H humid-coastal may use 2.7 with roof ventilation)	SANS 10400-XA:2021	XA:2011 was zone-specific {1:3.7, 2:3.2, 3:2.7, 4:3.7, 5:2.7, 6:3.5}. Confirm which edition the local authority is enforcing before you size anything.
Thermal-bridge / ψ-value control	No numeric limit is set by SANS 10400-XA — assess by rational design	SANS 10400-XA / SANS 204 (rational design)	Continuous insulation's real technical claim is bridge elimination across slab edges, ring beams, lintels and steel studs. There is no published Technopol ψ-value for these junctions — model your actual junction in the free 2D thermal-bridge tool rather than quoting a number.
Reaction to fire of the insulation layer	Class B-s1,d0 (EPS FRCel 20DV, 60 mm)	SANS 53501-1	VERIFIED, report IT 23-08-00009 (valid to Aug 2028). This is a reaction-to-fire class, NOT a fire-resistance (minutes) rating. All EPS is combustible, fire-retardant treated.
Façade fire spread (large-scale) for the rendered EIFS system	Test on file — VALIDITY LAPSED (22 Jun 2026); revalidation required	SANS/BS 8414-2:2017	The Terraco EIFS Alpha System PASS (FTC 21-033) has lapsed and must NOT be presented as a current rating. On any project where a large-scale façade fire result is a condition of approval, treat this as unproven until retested.

Where it goes

The assembly

Decorative/weatherproof outer skin — OPTION A (render EIFS): Terraco Terracoat textured topcoat (Excel / Granule / Sahara, 0.8–3 mm grain) — Ready-mixed acrylic/silicone resin-bound render. It is the finish and weather skin only — it contributes no meaningful insulation; λ/R/U belong to the EPS board below it.
Reinforcement coat: Styrobond DP basecoat with Terramesh glass-fibre mesh fully embedded — The mesh coat is what makes the render impact- and crack-tolerant; it is not optional. Double-mesh at ground-floor impact zones.
Decorative/weatherproof outer skin — OPTION B (metal EIFS / rainscreen): LiteClad profiled 0.5 mm PPGL/PPGI steel weatherskin on top-hat rails or battens — LiteClad is BARE roll-formed steel — it is NOT a composite and has NO bonded EPS core (that is the separate NuClad board). Profiles: IBR Wide 990, Corrugated 990, Standing Seam 282/495, ClipClad 270, DutchClad 293 (wall only). The 0.5 mm steel adds negligible R; the EPS thickness behind it is an independent design input.
Continuous EPS insulation layer — Technopol bulk insulation (LiteCel / FRCel fire-retarded EPS board), thickness to suit the R-value target — This is the only layer that does the insulating. Grades 12–30 kg/m³ (λ 0.033–0.045 W/m·K, grade-dependent). Board runs continuously across studs, slab edges, ring beams and lintels — that continuity, not the λ, is the point of the application.
Fixing layer: adhesive dabs/ribbon and/or mechanical washer fixings back to the substrate — Mechanical fixings must be corrosion-appropriate and are the primary wind-load path on lightweight substrates. Solvent-based adhesives are NOT permitted against EPS (see 'Where not to use').
Substrate: masonry, concrete, or a sheathed light-steel-frame / LSF wall — On LSF, the sheathing board (not the EPS) carries the fixings. Note that the substrate, not the EPS, determines any fire-resistance (REI) rating of the wall.
Internal lining (LSF only): gypsum / fibre-cement lining per the tested assembly — Where an REI-rated load-bearing LSF wall is required, the assembly must follow the tested NuClad LiteCore build-up (FT 24-003) — you cannot substitute layers and keep the rating.

Layers listed outside → inside.

Every number, its source

Performance data & provenance

Property	Value	Standard	Source report	Status
EPS board thermal conductivity λ @10 °C (grade range: 12SD 0.045 to 30DV 0.033)	0.033–0.045 W/m·K	Manufacturer grade table (no named in-validity lab report)	Technopol bulk-insulation datasheet	Provisional
EPS board nominal density (grade range)	12–30 kg/m³	Manufacturer grade table	Technopol bulk-insulation datasheet	Provisional
EPS board-only thermal resistance, 50 mm sheet (derived across the λ grade range: 0.05/0.045 to 0.05/0.033)	1.1–1.5 m²K/W	R = t/λ, derived in-house from the PROVISIONAL datasheet λ range — board only, excludes all other layers	Derived from Technopol bulk-insulation λ (no lab report)	Calculated
EPS board compressive stress @10% compression (grade range)	60–200 kPa	Manufacturer grade table	Technopol bulk-insulation datasheet	Provisional
EPS service temperature (long-term / short-term)	80 / 100 °C	Manufacturer datasheet	Technopol bulk-insulation datasheet	Provisional
Reaction-to-fire class — EPS FRCel 20DV, 60 mm (Euroclass)	B-s1,d0 class	SANS 53501-1 (reaction to fire — NOT a fire-resistance/minutes rating)	IT 23-08-00009 (valid to 2028-08-04)	Verified
Fire-resistance (REI) rating of a plain EPS board / generic EPS-and-render wall	None — plain EPS cores carry no fire-resistance rating; all EPS is combustible (fire-retardant treated only) —	SANS 10177-2	No passing in-validity test exists for a plain EPS-core wall	Provisional
Fire-resistance — NuClad LiteCore LSF wall assembly (load-bearing)	FR60 (E/I/R 60) min	SANS 10177-2 — applies to that tested assembly only, not to a generic EIFS wall	FT 24-003 (valid to 2029-04-22)	Verified
Façade fire spread — Terraco EIFS Alpha System, large-scale test	PASS on file — VALIDITY LAPSED 22 Jun 2026; revalidation required before this may be relied on. Not a fire-resistance rating. —	SANS/BS 8414-2:2017	FTC 21-033 (lapsed)	Lapsed
LiteClad steel skin gauge (bare pre-painted steel weatherskin — NO bonded EPS core, not a composite panel)	0.5 mm	Published LiteClad datasheet	Technopol LiteClad datasheet	Provisional
LiteClad profile cover widths (IBR Wide 990 / Corrugated 990 / Standing Seam 282 & 495 / ClipClad 270 / DutchClad 293 wall-only)	990 / 990 / 282 & 495 / 270 / 293 mm	Published LiteClad datasheet	Technopol LiteClad datasheet	Provisional
LiteClad contribution to thermal resistance	Negligible — 0.5 mm steel adds effectively no R; the separate EPS layer thickness is an independent design input m²K/W	—	Technopol LiteClad datasheet	Provisional
Terraco render — adhesion / pull-off bond strength	>2.0 N/mm²	Supplier datasheet (no named lab report)	Terraco technical datasheet	Provisional
Terraco render — water behaviour (vapour-permeable, low liquid uptake)	Sd <0.10 m; W24 <0.15 kg/m²·h^0.5 —	Supplier datasheet	Terraco technical datasheet	Provisional
Terraco render — grain size / finish grades (Excel, Granule, Sahara)	0.8–3 mm	Supplier datasheet	Terraco technical datasheet	Provisional
Terraco render — coverage	1.5–4.5 (grade-dependent; ~2.0 typical — 25 kg pack ≈ 12.5 m²) kg/m²	Supplier datasheet	Terraco technical datasheet	Provisional
Quality management certification (company)	ISO 9001:2015 — valid to 2028-06-02 (ISO 14001 and ISO 45001 LAPSED Mar 2026) —	ISO 9001:2015 (EQCSA, SANAS C22)	Reg no. Q 2016024	Verified
Agrément SA certification scope	Certificate 2020/609 covers the LiteCore Building System ONLY, as a NON-LOAD-BEARING wall. It does NOT cover LiteClad, Terraco coatings, bulk EPS board, LiteSpan or geofoam. —	Agrément South Africa	Certificate 2020/609 (amended Mar 2021)	Verified

What these labels mean is defined on our data promise; every source report is on the register.

On site

Installation

Confirm the substrate is sound, dry, plumb and free of laitance, form-release oils, dust and loose paint. On LSF, confirm the sheathing board and its fixing pattern are complete and signed off — the EPS is not a structural sheathing.
Set out and fix a starting/base track or drip bead at the bottom of the insulation zone, above the splash/ground-contact zone. Do not run EPS board down into permanently damp ground contact.
Bond the EPS boards with an EPS-compatible cementitious/dispersion adhesive (dabs or ribbon-and-dab) and/or mechanical washer fixings. NEVER use a solvent-based adhesive, bitumen primer or solvent-borne mastic against EPS — the solvent dissolves the cells.
Lay boards break-bonded (staggered joints), tight-butted, with no adhesive in the joints. Interlock boards around corners and cut single boards around openings so that no board joint lines up with a window or door corner — that is where the render will crack.
Rasp the board face flat after the adhesive has set. A flat board face, not a thick basecoat, is what produces a flat render.
OPTION A (render EIFS): apply the Styrobond DP basecoat, fully embed the Terramesh glass-fibre mesh with 100 mm overlaps, add diagonal mesh patches at all opening corners and a double mesh layer in ground-floor impact zones, then apply the Terracoat topcoat (Excel / Granule / Sahara, 0.8–3 mm grain) in the specified texture.
OPTION B (metal weatherskin): fix top-hat rails / battens through the EPS to the structure, then fix LiteClad over them — Standing Seam / ClipClad on concealed clips, IBR Wide 990 / Corrugated 990 with exposed roof screws. LiteClad is the weather skin only; the EPS behind it carries the whole thermal duty.
Protect the EPS from UV. Do not leave the insulation layer exposed and un-coated / un-clad on site — cover it within the shortest practicable period.
Detail the terminations: head, sill, jamb, parapet and slab-edge. The continuity of the EPS across the slab edge, ring beam and lintel is the entire value of continuous insulation — a bridged slab edge undoes it.
Record the actual grade, thickness and fixing pattern installed, and check the as-built build-up against the SANS 10400-XA compliance checker before sign-off.

The limits

Where not to use this

A material specified for the wrong job fails you, then us.

Against or near flues, chimneys, braai/boiler enclosures, or any hot surface

ALL EPS is combustible — it is fire-retardant treated, not non-combustible. Its service temperature is roughly 80 °C long-term / 100 °C short-term (PROVISIONAL, datasheet); it softens and recedes well below flame temperatures. The valid B-s1,d0 class (IT 23-08-00009) is a reaction-to-fire class, not permission to place EPS against a heat source.

→ Keep EPS clear of the flue/appliance by the appliance manufacturer's and SANS 10400-T clearances; use a non-combustible board (stone wool) or a masonry surround in the hot zone.

Where the wall must carry a fire-RESISTANCE (REI / minutes) rating — party walls, escape routes, boundary walls, firewalls

A plain EPS core has NO fire-resistance rating. The old Stone Wool FR30/FR60 (FTC 20-011) and FR120 firewall (FTC 20-119) results have LAPSED, and PIR carries no fire-resistance rating at all (a 100 mm PIR 40 panel FAILED its SANS 10177-2 test). Nothing here gives you minutes.

→ Specify a tested REI assembly — Technopol's only currently-valid load-bearing result is FR60 (E/I/R 60) on the NuClad LiteCore LSF wall (FT 24-003), and it holds only for that exact build-up. Otherwise use a Stone Wool core or a rated masonry/plaster system.

High-rise or high-consequence façades where a valid large-scale façade fire-spread result is a condition of approval

The Terraco EIFS Alpha System large-scale façade test (FTC 21-033, SANS/BS 8414-2) LAPSED on 22 June 2026. It is a test on file, not a current rating, and must not be submitted as one.

→ Treat the façade fire evidence as unproven pending revalidation of the SANS/BS 8414-2 test, and design the fire strategy accordingly (cavity barriers, non-combustible bands, or a mineral-wool insulation layer) rather than relying on a lapsed pass.

On ordinary cavity masonry or ≥140 mm plastered single-leaf walls, sold as an XA compliance necessity

Under SANS 10400-XA a double-skin (cavity) masonry wall, or a plastered single leaf ≥140 mm, is DEEMED-TO-SATISFY with no added insulation. Selling EIFS as a code requirement on such a wall is simply false.

→ If the wall is already deemed-to-satisfy, only specify continuous insulation where you can justify it on comfort, energy modelling or bridge control — and say so honestly rather than invoking the code.

In contact with solvent-based adhesives, bituminous primers, petroleum products or solvent-borne mastics

Polystyrene is dissolved by aromatic and chlorinated solvents, solvent-borne bitumen primers, and many PU/MS solvent-carried mastics. The board simply melts away at the contact face.

→ Use only EPS-compatible cementitious/dispersion adhesives and water-based primers. Where a solvent-based membrane or bituminous primer is unavoidable, separate it from the EPS with a compatible barrier board.

Left exposed to UV / weather for extended periods during construction

Unprotected EPS chalks, yellows and becomes friable under UV, and a degraded surface will not hold the basecoat bond. The system has no weather integrity until the outer skin is on.

→ Cover the insulation with the render or cladding within the shortest practicable period; rasp back any yellowed/friable surface before rendering.

Carrying sustained structural or bearing load (under footings, backfill, slabs, trafficked surfaces)

EIFS board is a non-structural insulation layer. Sustained load beyond about 1% compressive strain drives long-term creep; board compressive stress @10% is only 60–200 kPa (PROVISIONAL, grade-dependent) and 10% strain is a failure metric, not a design allowable.

→ Use geofoam (a graded, load-rated EPS engineered to a 1% strain design limit — see the geofoam design checker) or a load-bearing structural solution.

Below grade, in permanent ground contact, in splash zones, or as an inverted/warm-roof insulation layer

EPS is closed-cell but not impermeable — prolonged saturation raises its moisture content and erodes the effective λ, and a rendered EIFS skin is not a below-grade waterproofing system. The same moisture-uptake caution applies to inverted / protected-membrane roofs, which are a separate application with their own board specification.

→ Terminate the insulation above the splash/ground line on a base track with a drip; use a closed-cell, load-rated below-grade product (geofoam / perimeter board) below that line.

High-impact / high-abuse ground-level zones without an armoured detail

A rendered EPS skin has low impact resistance. In high-abuse zones — loading yards, plant rooms, public frontages, agricultural buildings — the render will be punched through.

→ Use a masonry or impact-rated build-up at ground level, or at minimum double the mesh reinforcement in the impact zone and detail an armoured base.

Questions

Specifier FAQ

Does SANS 10400-XA force me to add external insulation to my wall?

Usually no. Under SANS 10400-XA a double-skin (cavity) masonry wall, or a plastered single leaf of 140 mm or more, is DEEMED-TO-SATISFY with no added insulation. Only lightweight / non-qualifying walls must reach a minimum total R of 0.35 m²K/W. Continuous insulation is therefore specified either (a) because the wall is lightweight (LSF, panel, thin-leaf), or (b) as a deliberate performance move — thermal-bridge control, comfort, energy modelling, or a SANS 204 rational-design route — not because the code demands it on ordinary masonry.

Is LiteClad an insulated panel?

No. LiteClad is bare 0.5 mm pre-painted steel that is roll-formed into profiles. It has no bonded EPS core and must never be specified or sold as a composite or insulated panel. In this application it is the weatherskin laid OVER a separate continuous EPS layer on top-hat rails. The steel-faced EPS composite board is a different product (NuClad); the factory-laminated sandwich roof/wall panel is another (LiteSpan).

What R-value will I get?

It depends on the EPS grade and thickness you specify, plus the rest of the build-up — not on the render or the steel skin. Board-only R for a 50 mm sheet works out to roughly 1.1–1.5 m²K/W across the λ 0.033–0.045 W/m·K grade range (a CALCULATED figure derived from PROVISIONAL datasheet λ). Run the actual build-up through the free SANS 10400-XA checker rather than quoting a headline number.

Is the render system fire-tested?

There IS a large-scale façade fire test on file for the Terraco EIFS system (SANS/BS 8414-2, report FTC 21-033) but its validity LAPSED on 22 June 2026 — it must be described as 'test on file, validity lapsed, revalidation required', never as a current rating. The one currently-valid fire claim relevant to the EPS layer is reaction-to-fire Class B-s1,d0 to SANS 53501-1 (IT 23-08-00009, EPS FRCel 20DV 60 mm). Reaction-to-fire is not a fire-resistance (minutes) rating.

Can I get a fire-resistance (REI) rating out of an EPS EIFS wall?

Not from the EPS board itself — plain EPS core has no REI rating. The only currently-valid load-bearing fire-resistance result Technopol holds is FR60 (E/I/R 60) to SANS 10177-2 on the NuClad LiteCore LSF wall assembly (FT 24-003). That rating belongs to that tested assembly, not to a generic EPS-and-render wall. Where an REI wall is required, specify the tested assembly or a Stone Wool-cored solution.

Does Technopol's Agrément certificate cover this system?

No. Agrément SA 2020/609 covers the LiteCore Building System ONLY, as a non-load-bearing wall. There is no Agrément certificate for LiteClad, Terraco coatings, bulk EPS board, LiteSpan or geofoam. A product certificate is also not a company credential.

What certification does Technopol actually hold today?

ISO 9001:2015 (quality management), valid to 2 June 2028. ISO 14001 and ISO 45001 lapsed in March 2026 and are being recertified — they must not be presented as current.

How thick should the EPS be?

Set the thickness from the R-value target, not from habit. Use the XA compliance checker to back-solve the required board R for your wall build-up and zone, then pick the nearest stock thickness. Also check the thermal-bridge (ψ-value) tool if you have slab edges, balconies or steel penetrations breaking the layer — those bridges routinely erode more performance than the last 20 mm of board adds.

Continuous Insulation (EIFS)

Performance targets

The assembly

The products that do this job

Bulk Insulation Products

Terraco Textured Coatings

LiteClad Steel Profiles

Adhesives & Sealants

Cold-Formed Steel

Performance data & provenance

SANS 10400-XA compliance checker

Installation

Where not to use this

Project references

Menlyn Maine Residences Ph2

Indus, Menlyn Maine

Irene Link, building D

Summit Place, building D

Shoprite, Centurion Mall

House Coetzer, 1976

Specifier FAQ

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