High-modulus fiberglass blades for brise-soleil, fins, and louver arrays — built on F1's multi-layer fabric-reinforced pultruded plate with a full-section modulus up to 40 GPa (E40). Long spans between brackets, no thermal bridge through the envelope, no corrosion, and one blade family that works vertically and horizontally.
It is long, thin, fully exposed, loaded by wind in both directions, and judged by eye down a 40-blade array where a single sagging fin is visible from the street. Deflection governs everything — and deflection is set by the modulus of the blade material, not its strength.
That is the problem F1 Composite's facade sunshade plate was developed to solve. Where standard pultruded flat sheet reaches the EN 13706 E17 or E23 grades — 17 to 23 GPa full-section modulus — our multi-layer fabric-reinforced plate reaches E40: up to 40 GPa across the full section. The gain comes from a laminate F1 developed specifically for thin structural plate: multiple stitched multiaxial fabric layers distributed through the thickness over a high-count unidirectional roving core, so the blade is stiff along its span and across it.
The biaxial capability is what makes one blade family serve a whole elevation: vertical fins spanning floor to floor, horizontal louvers carrying gravity and wind together, angled blades in between. Add what pultruded FRP brings to any facade element — no thermal bridge at the brackets, no corrosion in coastal exposure, about a third of the thermal movement of aluminum, and an architectural AAMA 624/625 finish in any RAL color — and the E40 plate becomes the rational blade material for high-performance envelopes.
Shading arrays fail on details: brackets that bridge the envelope, blades that sag or rattle, coatings that chalk on the sun side. The E40 plate is engineered against each failure mode.
EN 13706 grades pultruded structurals at E17 and E23 — a full-section modulus of 17 or 23 GPa. F1's multi-layer fabric-reinforced plate reaches E40: up to 40 GPa across the whole section, not just in a fiber-direction coupon. On a sunshade blade that stiffness translates directly into longer spans between brackets, thinner blades for the same deflection limit, and fewer penetrations through the curtain wall.
A roving-only pultrusion is stiff along its length and weak across it. The E40 plate stacks multiple layers of stitched multiaxial fabric (0°/90°/±45°) through the thickness, so transverse modulus and strength run at a multiple of conventional flat sheet. That is what lets one plate serve as a vertical fin, a horizontal louver, or an angled blade — the biaxial wind-load demands of facade shading are engineered into the laminate itself.
Every aluminum sunshade bracket is a conductive path punched through the insulation line — the penalty shows up in the whole-facade U-value calculation and as condensation risk at the anchor. FRP conducts heat at roughly 0.3 W/m·K, about 1/500th of aluminum, so an FRP blade on FRP brackets adds far less heat flow at each anchor. The metal fixings remain small point bridges and still belong in the facade U-value calculation.
At 1.9–2.0 g/cm³ the plate runs about a quarter of the density of steel and 25–30% under aluminum, and at equal weight a thin FRP plate is stiffer in bending than a thin steel or aluminum plate. Lower dead load means lighter substructure, smaller anchors into the mullion or slab edge, and blades a two-person crew can set without mechanical lifting.
A sunshade blade lives in the harshest thermal-cycling position on the building — full sun to shade, every day. FRP's coefficient of thermal expansion (≈ 7–9 × 10⁻⁶/K) is close to glass and a third of aluminum's, so a 4 m blade moves about 2 mm (1.7–2.2 mm) across a 60°C swing where aluminum moves 5.5 mm. Joints stay tight; there is no thermal walk, bracket-slot wear, or the oil-canning that shows on aluminum sheet in raking light.
Coastal chloride, urban pollution, and constant wet-dry cycling attack coated aluminum and steel shading over a facade's life. The pultruded plate cannot corrode, carries a resin-rich surface veil under an architectural coating in any RAL color, specified to AAMA 624 or 625, the FGIA coating specifications for fiber-reinforced thermoset profiles (AAMA 2604 and 2605 cover aluminum). There is no recoating budget for corrosion protection.
Because the fabric stack is specified per project, the laminate is tunable: a floor-to-floor vertical fin gets more unidirectional content for span, a wide horizontal louver gets more ±45° and 90° fabric for the gravity axis and the bolt group at its brackets. You send the blade geometry and the wind report; we return the layup and the deflection check.
The E40 plate · standard format
The multi-layer fabric plate itself: 3–25 mm thick, widths to 600 mm, cut to blade length from a continuous pultrusion run. The workhorse format for fin and louver arrays — a clean rectangular section that reads crisp on the facade, machines with standard tooling, and takes concealed or clamped fixings. Practical maximum shipping length is container-limited at 11.8 m.
Custom die · hollow section
Hollow aerofoil and elliptical sections pultruded on a dedicated die, for shading arrays where the architect wants a wing profile or the engineer wants more projected width per kilogram. The closed section adds torsional stiffness for blades on pivot mounts and operable-louver retrofits. Dies to 600 × 300 mm envelope through our custom pultrusion program.
Custom die · hollow section
Closed box and trapezoid sections for the longest fins and deepest louvers, where torsional restraint between widely spaced brackets governs the design. Wall thickness and internal webs are tuned to the wind-load report, and the same multi-layer fabric architecture carries the corner and web stresses.
Vertical fins and horizontal louvers load a blade in fundamentally different ways. The multi-layer fabric laminate is what lets the same plate carry both.
Wind pressure and suction flatwise · self-weight axial · floor-to-floor spans
Vertical fin arrays, the classic brise-soleil for east and west elevations, often run floor to floor at 3–4 m. The load case is almost pure flatwise bending under wind pressure and suction, and deflection, not strength, governs the blade. This is where the E40 modulus pays, but a flat plate spans less than a floor height at typical design pressures (see the bracket-spacing table below): a floor-to-floor fin on two anchors needs a hollow section, a low design pressure or an intermediate bracket. Self-weight acts along the blade axis, where the pultrusion is strongest.
Gravity edgewise · wind flatwise · combined biaxial bending
Horizontal louvers and projecting sunshades on south elevations carry a harder combination: self-weight bends the blade edgewise, wind bends it flatwise, and maintenance and drift loads add to the gravity case — biaxial bending at every span. A roving-only section handles the wind axis and fails the designer on the gravity axis; the multi-layer fabric plate carries both, which is why one E40 blade family serves the whole facade, horizontal and vertical.
A sunshade blade is a continuous beam on bracket supports carrying a wind line-load, and its design is decided by the serviceability check: deflection between brackets, held to L/180–L/240 in most facade specifications — both for appearance down the array and to keep blade tips off the glass line. Beam deflection scales with q·L⁴/(E·I): the load and span are fixed by the architecture, the section by the sightline the architect will accept. The one lever left is E — the modulus of the blade material. That is the entire design case for the E40 plate in one sentence.
The arithmetic is direct. Deflection-limited bracket spacing scales with the cube root of modulus, so moving from a standard E23 pultrusion to the E40 plate buys 20% more span from the identical blade — or, holding the bracket grid, the same deflection limit is met by a blade about 17% thinner and lighter. And because stiffness — not strength — sizes the section, the working bending stress ends up at a small fraction of the laminate's ultimate, which is precisely the margin that makes the fatigue behavior below a non-issue.
One honest caveat belongs here: for horizontal louvers, self-weight is a sustained load, and polymer composites creep under sustained stress. On a thin blade at 2.0 g/cm³ the gravity stress is small, and we verify the sustained case with long-term modulus reduction factors as standard, so creep deflection over the design life is checked rather than assumed.
A facade blade sees millions of fully-reversing gust cycles over the building's life — fatigue, not peak load, is what actually retires metal shading systems. Six mechanisms put the FRP blade on the other side of that problem.
Because the blade is sized by deflection, its working bending stress typically lands below 15–20% of the laminate's ultimate strength. At that amplitude, glass-fiber laminates are generally expected to exceed 10⁷ load cycles with limited stiffness loss, so the gust spectrum over the facade's design life sits toward the flat end of the S-N curve. Confirm with fatigue data for the specified laminate where the project requires a fatigue check.
Aluminum has no fatigue endurance limit — its life keeps falling with every decade of cycles, and the governing details on an aluminum shading system are exactly the bad ones: bolt holes, notches, welded tabs, and slotted expansion holes that add fretting on top of cyclic stress. The FRP blade replaces all of them with plain bolted bearing in a fabric-reinforced laminate at low stress ratio.
Metal fatigue is single-crack propagation: one initiation site at a hole edge, then stable growth to fracture. A multi-layer fabric laminate fails differently — matrix microcracks are arrested at the ±45° stitched layers, delamination fronts are pinned by the through-thickness stitching, and load redistributes around local damage. Degradation is gradual and inspectable, not sudden.
Slender fins shed vortices and can ring in resonance. The material loss factor of a glass laminate is roughly an order of magnitude above aluminum, which compensates its lower mass in the Scruton-number stability check, cuts resonant amplitude, and eliminates the metallic ring and rattle aluminum arrays develop. We screen slender fin geometries for vortex-induced vibration as part of the engineering package.
Gust loading fully reverses: positive pressure on one cycle, suction on the next. The E40 plate is laminated symmetrically about its midplane, so stiffness and strength are identical in both directions, and connections are checked for the reversed reaction — there is no one-way detail to work loose over millions of reversals.
On steel and aluminum, weathering and fatigue multiply: corrosion pits become crack initiation sites, and fatigue cracks breach coatings to accelerate corrosion. FRP breaks the coupling — there is no electrochemical corrosion to pit the surface, and the resin-rich veil plus PU topcoat handle the daily thermal, wet–dry, and freeze–thaw cycling without a coating–substrate mismatch to craze.
Step 1
From the project's basic wind speed, terrain exposure, and blade height: q_p(z) to EN 1991-1-4, ASCE 7 components-and-cladding, or GB 50009 — whichever code your facade engineer signs under. High-rise elevations are banded by height so upper-floor blades aren't designed on ground-level pressure.
Step 2
Shading blades are open elements attached to the facade: the design coefficient depends on porosity of the array, blade angle, and position on the elevation. Mid-face louvers commonly design around c_p,net ≈ ±1.3; edge and corner zones, and free-standing fin tips, up to ±2.0. Pressure and suction both apply — the load fully reverses.
Step 3
w = q_p × c_p,net × projected blade width. A 250 mm louver at q_p = 1.0 kPa and c_p,net 2.0 carries 0.5 kN/m — modest in force, but acting on a long thin member where deflection, not strength, decides the section.
Step 4
Deflection against the specified limit (L/180–L/240 typical for shading) on the continuous multi-span blade; bending and shear at the bracket line — which rarely governs at deflection-limited stress levels; bracket reactions forwarded to the mullion or slab-edge anchor design; and a vortex-shedding screen for slender fins.
Step 5
Because the laminate is specified per run, corner-zone blades get a heavier layup or one extra bracket while the field of the elevation stays on the economic section — instead of upsizing every blade on the building to the worst-case coefficient.
Deflection-governed spacing for a 250 mm louver at c_p,net = ±2.0 (conservative edge-zone value), continuous over three or more brackets, deflection limit L/240. Strength and bracket reactions are verified separately; project values are confirmed by the KNOWHOW calculation package.
| Blade thickness | q_p = 1.0 kPa | q_p = 1.5 kPa |
|---|---|---|
| 10 mm | ≈ 1.1 m | ≈ 0.9 m |
| 15 mm | ≈ 1.6 m | ≈ 1.4 m |
| 20 mm | ≈ 2.2 m | ≈ 1.9 m |
| 25 mm | ≈ 2.7 m | ≈ 2.4 m |
Blades fix to aluminum, HDG-steel, or FRP brackets with A2/A4 stainless bolts — through-bolted or clamp-plate, per the facade detail. Bearing runs through the multiaxial fabric layers, which is exactly what they are laminated in for: edge distances ≥ 2.5d, oversize washers, controlled torque. Blades arrive factory CNC-drilled to the bracket pattern, so site work is bolt-up only.
With a CTE of 7–9 × 10⁻⁶/K, a 4 m blade moves about 2 mm across a 60°C swing, inside normal bolt-hole clearance where the brackets sit on concrete or steel. Blades therefore fix rigidly, without the slotted expansion holes aluminum needs. On an aluminum subframe, check the differential movement between blade and rail. That removes the fretting wear, thermal clicking, and locked-slot failures that aluminum shading develops as its slots seize with oxide and grime.
Glass-fiber FRP forms no corrosion couple with stainless, aluminum, or galvanized steel, so blades mount directly to any substructure without isolation pads or sleeves, and no white-rust or run-off staining bleeds down the finished facade. Metal-to-metal contacts between bolts and brackets still need the usual isolation.
Every site cut or drilled hole in coated aluminum breaches the anodizing or PVDF and starts an edge-corrosion front the warranty excludes. An FRP blade has no metallic substrate: factory edges ship sealed as standard, and any site modification is resealed with a brush-applied resin coat in minutes.
A 250 × 20 mm E40 blade weighs about 10 kg/m — a 3 m blade is a two-person lift from a MEWP or scaffold. No mechanical lifting, no welding permits, no hot work next to installed glazing. Blades machine with standard carbide tooling if the site must adapt, and each blade unbolts individually for replacement without disturbing its neighbors.
There is no recoat cycle for corrosion protection and no corrosion inspection interval. The maintenance scope of an FRP shading array is close to the one the facade already has: periodic cleaning, visual inspection, and a bolt-tension check at the interval the facade engineer sets, because clamped FRP joints can relax. That matters most on high-rise and coastal work, where every access event is a rope or rig cost.
| Property | Value | Design relevance |
|---|---|---|
| Full-section flexural modulus | Up to 40 GPa (E40) | vs 17 / 23 GPa for EN 13706 E17 / E23 standard grades |
| Transverse flexural modulus | 10 – 14 GPa | Multi-layer multiaxial fabric; roving-only flat sheet runs 5 – 7 GPa |
| Longitudinal tensile strength | 350 – 600 MPa | Layup-dependent; tuned per blade span and section |
| Density | 1.9 – 2.0 g/cm³ | ≈ 25% of steel, 25–30% under aluminum |
| Thermal expansion (CTE) | 7 – 9 × 10⁻⁶ /K | Aluminum: 23 × 10⁻⁶ /K — three times the movement per blade |
| Thermal conductivity | ≈ 0.3 W/m·K | Aluminum: 160 W/m·K; far smaller thermal bridge at brackets |
| Fire performance | FR resin systems | Fire-retardant formulations per project spec; available test reports on request. Not a noncombustible (A1 / A2-s1,d0) material |
| Finish | AAMA 624 / 625, any RAL | Architectural PU topcoat over resin-rich veil; AAMA 625 is the superior-performance tier for fiber-reinforced thermoset profiles |
| Criterion | Aluminum blade | F1 E40 FRP blade |
|---|---|---|
| Thermal bridging at brackets | Every bracket is a conductive penetration; thermal-break pads add parts and still leak heat | Low-conductivity blade and FRP bracket; only the metal fixings remain as small point bridges |
| Thermal movement (4 m blade, ΔT 60°C) | ≈ 5.5 mm — slotted fixings, expansion noise, joint wear | ≈ 2 mm: CTE close to glass; fixed connections stay quiet |
| Coastal & urban exposure | Coating breach → pitting; recoat cycle in aggressive environments | Cannot corrode; no recoating budget over the facade's life |
| Surface quality in raking light | Sheet and plate show oil-canning and weld/fixing print-through | Pultruded section is die-formed — flat and consistent along the full run |
| Span between brackets | Governed by extrusion alloy modulus (≈ 70 GPa) at 2.7 g/cm³ | E40 at 2.0 g/cm³ — comparable deflection performance per weight, fewer brackets than thin-wall extrusions in practice |
| Radio-frequency transparency | Shields antennas; conflicts with facade-integrated 5G / telecom zones | RF-transparent — shading arrays can run continuously across antenna zones |
Shading packages rarely arrive as a finished structural design — they arrive as an architect's blade geometry and a wind consultant's pressure map. Our KNOWHOW engineering service closes that gap: we run the span and deflection check against EN 1991-1-4 or ASCE 7 loads, tune the E40 laminate to the governing case, detail the bracket connections and bolt groups in the plate, and supply the calculation package with the quotation. Blades ship cut to length, CNC-drilled to the bracket pattern, finished in your RAL color, and palletized per elevation — quoted DDP to your port or jobsite.
FRP facade sunshade panels — also specified as brise-soleil, solar shading fins, or sun louvers — are pultruded fiberglass blades fixed to a curtain wall or facade to control solar heat gain and glare. F1 Composite supplies them as high-modulus thin plates (and custom hollow sections) produced by pultrusion: continuous E-glass reinforcement pulled through a heated die with a thermoset resin. The result is a blade that is stiff, light and corrosion-free, with a thermal conductivity far below aluminum, so it adds much less heat flow through the envelope at its brackets.
EN 13706, the European standard for pultruded structural profiles, defines two grades by full-section modulus: E17 (17 GPa) and E23 (23 GPa). F1's multi-layer fabric-reinforced plate reaches a full-section flexural modulus of up to 40 GPa — hence E40 — nearly double the highest standard grade. Sunshade blades are deflection-governed: they are long, thin, and loaded by wind. Modulus, not strength, sets how far a blade can span between brackets, so E40 directly buys longer spans, thinner blades, and fewer facade penetrations.
It depends on blade section, wind pressure, and the deflection limit in your facade specification (commonly L/180 to L/240 for shading elements). As an order of magnitude, the indicative table on this page gives about 1–2.7 m between brackets for 10–25 mm E40 louvers at 1.0 kPa; floor-to-floor spans of 3 to 4 m on two anchors need a hollow custom section, a lower design pressure or an intermediate bracket. We run the span check for your actual blade geometry and wind report (EN 1991-1-4 or ASCE 7) as part of quoting, and tune the laminate to the span rather than forcing the design onto a stock layup.
Yes — that is the point of the multi-layer fabric architecture. Vertical fins see mostly flatwise wind bending; horizontal louvers add edgewise gravity bending on top of it, a biaxial load case that exposes the transverse weakness of roving-only pultrusions. The E40 plate carries multiple stitched multiaxial fabric layers through its thickness, giving it transverse modulus of 10–14 GPa — roughly double conventional flat sheet — so one blade family serves both orientations across the facade.
This is where FRP holds a structural advantage over aluminum, which has no fatigue endurance limit — its life keeps falling with cycle count, governed by exactly the details a shading system is full of: bolt holes, notches, and slotted expansion holes with fretting. Because an FRP blade is sized by deflection, its working stress sits below 15–20% of the laminate's ultimate strength, a level at which glass laminates are generally expected to exceed 10⁷ cycles with limited degradation; fatigue data for the specified laminate confirm it where required. The multi-layer fabric also arrests matrix cracks rather than propagating them, the laminate is symmetric for full pressure–suction reversal, and material damping roughly an order of magnitude above aluminum suppresses vortex-induced resonance in slender fins.
With bolted brackets — through-bolted or clamp-plate — in A2/A4 stainless hardware onto aluminum, galvanized-steel, or FRP substructure. Blades ship factory CNC-drilled to your bracket pattern with sealed edges, so site work is bolt-up only: no welding, no hot work near installed glazing, and a 3 m blade at roughly 10 kg/m is a two-person lift. Because FRP's thermal expansion is a third of aluminum's, blades take fixed connections without slotted expansion holes — eliminating fretting wear and thermal clicking — and the material is galvanically inert, so no isolation pads are needed at any interface. Each blade unbolts individually for replacement.
Check the building regulation first. In England, the slats of solar shading devices on relevant buildings (a storey 18 m or more above ground, with dwellings, residential rooms or an institution) must reach class A1 or A2-s1,d0 to EN 13501-1, except devices below 4.5 m above ground; a polymer composite blade does not reach those classes. Since March 2025, Approved Document B also accepts only EN 13501-1 classes, not BS 476 national classes, for reaction to fire. In the US, exterior FRP falls under the plastics chapter of the IBC, which can require NFPA 285 assembly testing depending on building type and height. Where FRP is permitted, we offer fire-retardant resin systems and confirm which test reports exist for the offered formulation, with holder, number and scope, before quotation.
Blades ship with an architectural polyurethane finish in any RAL color, applied over the plate's resin-rich surface veil and specified to AAMA 624 or 625, the coating specifications for fiber-reinforced thermoset profiles (AAMA 2604 and 2605 are the aluminum equivalents). Request the coater's test report for the selected system and color. Dark colors are the hardest to hold against UV fade on a fully sun-exposed shading blade.
On blade material alone, a high-modulus FRP plate typically prices above a commodity aluminum extrusion. The comparison changes at system level: FRP needs no thermal-break hardware at the brackets, fewer brackets per elevation because deflection performance per weight is higher, lighter substructure because the blades weigh less, and no recoat cycle over the facade's life. On coastal and high-rise projects, where access costs dominate maintenance, the lifecycle comparison can favor FRP; run it with project prices. We quote DDP so the landed comparison is explicit.
Yes. Beyond the E40 flat plate, we pultrude custom hollow blade sections — aerofoil, elliptical, box, trapezoid — on dedicated dies up to a 600 × 300 mm envelope, through the same custom pultrusion program that serves our OEM clients. The multi-layer fabric architecture carries over to the hollow sections. Blades are cut to length, CNC-drilled to your bracket pattern, and finished before shipment, so they arrive install-ready.
Send the blade geometry and the wind report. We return the layup, the span and deflection check and a DDP quotation. We reply within one business day; a formal quotation follows once the specification and delivery are reviewed.