RENDER SUPPLY CO. NOT JUST RENDER.
Render Guide Calculator
Cladding Calculator
Moulding Calculator

Render Materials Calculator

Render quantity calculator tools should save you time—not add to the maths. That’s why Render Supply Co combines a foam-cladding calculator and a moulding estimator in one place. Enter a few wall measurements, choose your finish, and—within moments—you’ll see an itemised parts list you can trust.

Welcome to Render Supply Co’s Render & Cladding Calculators – your quick, no-stress way to nail your material list before the first bucket is mixed. Whether you’re refreshing a single façade or quoting an entire development, our suite of smart tools turns measurements into accurate shopping lists in seconds.

  • Render Quantity Calculator – Simply follow the form to help you choose your finish (acrylic, mineral, Venetian, textured) and we’ll pinpoint exactly how many bags, or buckets you’ll need, plus a handy allowance for waste.

  • External Foam Cladding Calculator – Work out panels, starter channels, screws, washers, and low-expanding foam at the click of a button. Perfect for NRG Greenboard, Dulux Exsulite, and our own RSC boards.

  • Moulding Calculator – Estimate lineal metres of profiles, joining compound, and sealants so your architectural trims install smoothly and look flawless.

Each calculator is mobile-friendly, lightning-fast, and built around our latest product data, so you’ll always get quantities that match live pack sizes and coverage rates. No more guesswork, no more leftover stock—just confident quotes, tighter budgets, and projects that stay on schedule.

Ready to start? Scroll down, pick your calculator, and let us handle the maths while you focus on the finish.

Brick work
Render Specification Guide and Calculator
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Render Supply Co Render Specification Guide

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Select the substrate / scenario:
1st-coat products
Base Coat Preparation Accessories Needed: Render Angles (2700mm or 3000mm) H-type screed or feather-edge darby Black poly float RLA Universal Primer (for painted brick only) Steps: Ensure the brick surface is clean and free of dust, oil, or loose material. For painted brickwork, apply RLA Universal Primer using a roller or brush and allow it to dry fully. Apply a 2–3 mm base coat of render — thicker where needed to fill voids. Screed the surface flat with an H-type or feather-edge tool. When the render is starting to soildify (firm but not dry), flatten the surface using a black poly float. Allow the coat to cure for approximately 24 hours. In warm, dry conditions, the second coat may be applied after 5 hours.
Insulcon Insulcon Brick Render Medium
Unitex Unitex Redi Render
Quikcoat Quikcoat Hi-Build
Quikcoat Quikcoat Coarse
Coharo Coharo Levelling Coat
Unitex Unitex Hi-Lite
Quikcoat Quikcoat Medium
Insulcon Insulcon Hi-Build
Unitex Unitex Fast R
2nd-coat products
Levelling Coat Once the base coat has set, apply a 1–3 mm levelling coat. Float the surface using a tight circular motion. Lightly mist the wall with water to help keep the surface workable, allowing you to: Close pinholes Move and smooth the render Achieve a uniform, flat finish
Insulcon Insulcon Brick Render Medium
Unitex Unitex Redi Render
Quikcoat Quikcoat Coarse
Unitex Unitex Hi-Lite
Quikcoat Quikcoat Medium
Insulcon Insulcon Hi-Build
Unitex Unitex Fast R
3rd-coat • Top-coat Texture
Final Texture or White-Set Finish Apply your chosen topcoat (texture or white-set) at the manufacturer’s recommended thickness — typically 1–2 mm. Ideal application temperature is 20–23°C: Below this range, drying may take up to 3 days Above it, the surface can skin too quickly, affecting finish quality Use a red plastic float for final finishing. If swirl marks persist, it usually means: The coat is too thick, or The surface/substrate is too cold A correct finish will leave a smooth, even surface ready for painting or sealing.
Unitex Unitex Dry Texture 855
RSC Coarse Trade Texture RSC Trade Texture 15lt
Insulcon Dry Texture Insulcon Dry Texture
Unitex Unitex Textures, Cement Finishes

1st‑coat products
Base‑Coat & Reinforcement Accessories & Tools –
Render Angles (2700 mm or 3000 mm),
1.2 m alkali‑resistant mesh (full roll),
RLA Porous Primer,
H‑type screed or feather‑edge darby, black poly float,
scissors/knife & straight‑edge for cutting mesh

Steps – Prep & prime: Make sure the AAC surface is clean, dry, and free of dust. Roll or brush on RLA Porous Primer to control suction; let it dry completely.
Apply the base coat (2–3 mm): Trowel render onto the wall, building up thicker where voids need filling. Immediately embed the 1.2 m mesh from top to bottom, lapping joins by at least 100 mm and fully wrapping corners/render angles. Screed flat with an H‑type or feather‑edge darby.
Float & cure: When the render is firm but still green, flatten with a black poly float. Allow to cure for ≈ 24 h (in warm, dry conditions you can proceed after ≈ 5 h).
Insulcon Insulcon Dry Patch
Unitex Unitex Fast R
MAC MAC FR Render
Unitex Unitex Dry Poly
Other Quickcoat Dry Poly Render
Other Wet Patch
Quikcoat Quikcoat Hebel Render
2nd‑coat products
Surface‑Readiness (Typically one pass) – AAC generally needs only this single reinforced base coat. Check the wall: if pinholes or low spots remain, spot‑fill and re‑float so the surface is perfectly flat and closed. Once satisfied, leave to hard‑set and re‑prime if required by the top‑coat manufacturer.
Insulcon Insulcon Brick Render Medium
Unitex Unitex Redi Render
Unitex Unitex Fast R
Quikcoat Quikcoat Coarse
Other Quickcoat Medium
Unitex Unitex Harbour Fine
Other Quickcoat Fine Render
3rd‑coat • Top‑coat Texture
Top‑Coat / Decorative Finish – Choose your finish — acrylic texture, fine cement finish, or exterior Venetian plaster. Ensure the base coat is dead‑flat, fully cured, and correctly primed for the selected system. Apply the finish at the supplier’s specified thickness (≈ 1–2 mm for most acrylic textures; finer for Venetian plaster). Float off with the appropriate tool (red plastic float for texture, steel trowel for Venetian) in ideal temps of 20–23 °C. Cooler weather will slow drying (up to 3 days). Hot, windy conditions may cause premature skinning — mist lightly if needed. A correct application yields an even, blemish‑free surface ready for paint or sealer.
RSC RSC Coarse Trade Texture
Unitex Unitex 855 Dry Texture
Insulcon Insulcon Dry Texture
Unitex Unitex Textures, Cement Finishes
1st-coat products
Joint Preparation Accessories & materials Render Angles (2.7 m / 3 m) Alkali-resistant fibreglass mesh – 200 mm (preferred for control joints) or 50 mm tape for board-to-board seams Dry Patch (dry-poly) or Wet Patch polymer render Steps Clean & inspect Remove dust, loose fibres, and surface contaminants. Check sheets are securely fixed with approved screws and correct gapping. Bridge the joins Trowel a thin bed of Dry Patch or Wet Patch over every sheet junction and around corners/render angles. Embed the mesh centrally in the fresh render, pressing it tight so no voids remain. Feather edges with the trowel to keep the joint flush with the board face. Snag-check Once joints have taken up, lightly scrape off ridges or beads to keep the surface flat for the next coat.
Insulcon Insulcon Wet Patch
Quikcoat Quikcoat Dry Polymer Render
Unitex Unitex Dry Poly Render
2nd-coat products
Full Reinforced Base Coat Polymer render only Use a flexible polymer-modified render (or Wet Patch) for the entire façade—essential for fibre-cement movement. Apply 2–3 mm over the whole area, filling any shallow recesses from Stage 1. Mesh banding (optional in high-movement zones) For walls subject to extra stress (e.g., above lintels), bed 200 mm mesh strips into the wet render. Screed & float Screed flat with an H-type or feather-edge darby. When the render is firm but still retains mosture, float with a black poly float to close pinholes and achieve a level, even surface. Optional second base pass If the wall still shows joints or hollows, apply a second skim using Dry Patch or Wet Patch only. Re-float flat and allow to cure (≈ 24 h; 5 h in warm, dry weather).
Unitex Unitex Dry Poly Render
Insulcon Insulcon Dry Poly Render
Quikcoat Quikcoat Dry Polymer Render
3rd-coat • Top-coat Texture
Acrylic Texture Finish Confirm readiness Base coat must be fully cured, clean, and dust-free. Prime if specified by the texture manufacturer. Apply texture (≈ 1–2 mm) Use the manufacturer’s acrylic texture or fine finish coat. Work in controlled areas to maintain a wet edge. Float-off timing Once the texture loses initial gloss but is still pliable, red plastic float in a tight circular motion until uniform. Good timing prevents drag marks and ensures consistent aggregate exposure. Curing & weather Ideal temp: 20–23 °C. Cooler days prolong set time; hot, windy days require misting and smaller work zones. (NOTE NO Cement finishes are advised over Foam substrates unless cleared by manufactures specifications check before advising) A correct application leaves a seamless, crack-resistant surface ready for paint or clear sealer.
RSC RSC Coarse Trade Texture
Unitex Unitex Textures, Cement Finishes
Unitex Unitex 855 Dry Texture
Quikcoat/td>

Quikcoat Texture
1st-coat products
Base-Coat & Mesh Installation Accessories & tools Render Angles – 2700 mm / 3000 mm Starter Channels (installed during cladding) 1200 mm alkali-resistant fibreglass mesh (non-adhesive) Foam Rasp / Planer Foam-compatible adhesive glue or PU foam EPS Base Render, Dry Patch, or Wet Patch H-type screed / feather-edge darby & black poly float Steps Foam preparation Check boards are plumb, tight-butted, and mechanically fixed. Rasp the surface to remove high spots and create a light key, then brush/blow off dust. Install angles & edge trims Bond render angles to corners and reveals with foam adhesive; ensure straight, true lines. Re-check starter channels for alignment and fix any gaps. Embed full-width mesh with first coat Trowel 2–3 mm of EPS base render onto the foam. Press the 1.2 m mesh into the wet render from top down, overlapping joins ≥ 100 mm and fully wrapping corners. Screed and flatten with a black poly float so mesh sits just below the surface. Perfection isn’t required at this stage; slight mesh ghosting is normal. Cure Allow to set ≈ 24 h (or ≥ 5 h in warm, dry conditions) before the levelling coat.
Insulcon Insulcon Dry Patch
NRG NRG PM Render
Quikcoat Quikcoat EPS Render
Unitex Unitex Dry Poly
Quikcoat Quickcoat Dry Poly Render
2nd-coat products
Levelling Coat Apply 2–3 mm levelling pass Use the same polymer-modified render. Fill any hollows or mesh impressions. Screed & float Screed flat, then float while green to close pinholes and leave a smooth, even plane. Optional extra skim If absolute flatness is critical, a light third skim with Dry Patch / Wet Patch can follow once the levelling coat has firmed. Cure fully before top-coating.
Insulcon Insulcon Dry Patch
NRG NRG PM Render
Quikcoat Quikcoat EPS Render
Unitex Unitex Dry Poly
Quikcoat Quickcoat Dry Poly Render
Insulcon Insulcon Highbuild Plus
3rd-coat • Top-coat Texture
Flexible Acrylic Texture Finish Prime if specified by the texture manufacturer. Apply acrylic texture at ≈ 1–2 mm. Work in manageable sections to keep a wet edge. Float-off – as soon as the surface loses its sheen but is still workable, use a red plastic float in tight circular motion to achieve a consistent texture. Environmental tips Ideal temp 20–23 °C. Cooler weather: allow extra drying time. Hot/windy conditions: mist lightly and reduce panel size to avoid rapid skinning. A correct system produces a flat, crack-resistant façade ready for paint or clear sealer.(NOTE NO Cement finishes are advised over Foam substrates unless cleared by manufactures specifications check before advising)
RSC RSC Coarse Trade Texture
Unitex Unitex 855 Dry Texture
Unitex Unitex Textures, Cement Finishes
1st-coat products
Accessories & tools Internal plaster angles or corner beads (2.4 m / 2.7 m) Sand–cement–lime render (≈ 4 : 1 : 1) or premix Hi-build Render RLA Universal Primer (only for painted or highly absorbent brick) H-type screed / feather-edge darby Hawk, steel trowel & clean buckets Steps Prep & prime Brush bricks clean; rake out loose mortar. For painted or dusty brick, roll/brush on RLA Universal Primer and allow to dry. Apply the scratch coat (≈ 6–8 mm) Depending on size of voids or cracks. Trowel render onto the wall, filling joints for full coverage. Screed flat, maintaining plumb with the darby. Scratch horizontal key lines 3–4 mm deep with a comb. Cure Mist-spray if the room is hot/dry. Minimum set — 12 h; overnight is ideal.
Insulcon Insulcon Brick Render Medium
Unitex Unitex Redi Render,Unitex Hi-Lite,Coharo Levelling Coat, Quikcoat Hi Build
2nd-coat products
Float (Levelling) Coat Apply levelling coat (≈ 6 mm) Use the same mix or a polymer-modified float coat for better adhesion. Rule off to a true, even plane. Float & firm When the render is starting to solidify, rub with a black float in tight circles. Fill any hollows; the surface must be flat but still slightly open-textured for the white set. Cure Allow to set until firm—typically 12–24 h depending on temperature.
Insulcon Insulcon Brick Render Medium
Unitex Unitex Redi Render
3rd-coat • Top-coat Texture
White-Set Finish Control suction Lightly dampen the float coat; avoid surface sheen or standing water. Mix & apply white set Use neat lime putty gauged with fine gypsum plaster (≈ 1 part gypsum : 2–3 parts lime putty) or a bagged white-set product (Pro-Rock Multi finish). Trowel on 1–2 mm in tight, even strokes. Polish As the coat firms (loses sheen but still workable), steel-trowel with light pressure. Multiple passes at 5–10 min intervals compress and polish the surface to a smooth, marble-like finish. Environment & drying Ideal room temp 18–24 °C; good airflow but no direct draughts. Protect from rapid drying for the first 24 h—mist lightly if needed. A correctly executed white-set delivers a hard, smooth, paint-ready surface with the classic interior plaster finish.
Pro Rock Pro Rock Plaster
Other Multi Finish

Bag & Texture Calculator

Formula Calculator

Render Supply Co
Foam EPS External Cladding Calculator

This is a formula calculator where you can enter the Square Meters (SQM's) to be Cladded.

Foam Thickness helps calculate the R-Value of the EPS Sheet.

This will calculate how many sheets you would need of the following thicknesses: 50mm, 75mm, 100mm, and 150mm.

PLEASE NOTE:

+50mm Foam boards → 75mm Screws
+75mm Foam boards → 100mm Screws
+100mm Foam boards → 125mm Screws
+150mm Foam boards → 180mm Screws
+Don't forget your starter channels for bottom of cladding.

🛒 Cladding Shopping List

Grab everything you need in one place:

EPS Foam Panels
Shop Renderboard Foam Panels
Render Board Screws
Shop Renderboard Cladding Screws
Render Washers (500 pcs)
Shop Render Washers
Low-Expanding Foam Adhesive
Shop Foam Adhesive
Starter Channels
Shop Starter Channels
Foam Rasp / Planer / Hot Knife
Shop Shaping & Cutting Accessories

Moulding Quote Calculator

🛒 Moulding Shopping List

At the heart of what we do is supplying you with quality render products, tools and accessories so you can complete your project with confidence.

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