Amogh N P
✦ In loving memory of Amogh N P — Architect · Designer · Visionary ✦
An Indian student cutting foam board with a knife and steel rule on a cutting mat.
Unit IIIModel Making & Architectural Delineation

Model-Making Materials & Techniques

Card, foam, balsa, acrylic, clay — and how to work them.

≈ 45 min

This is the workshop. The model-maker's skill is matching the right material to the job and working it cleanly — and, increasingly, letting form be generated and found. We survey the materials, the techniques, and the ideas that drive form from nature and number.

Learning objectives

By the end of this lesson you will be able to — mapped to the course outcomes for Model Making & Architectural Delineation:

1
CO3 · Understand

Choose appropriate traditional and new-age materials for a model.

2
CO3 · Apply

Cut, glue, cast and finish model materials cleanly and safely.

3
CO3 · Understand

Match a fabrication process — hand, casting, laser cutting — to the task.

4
CO3 · Analyse

Use generative, parametric and nature-to-structure ideas to explore form.

Traditional & new-age

The materials

From card and foam to acrylic and AAC — each material has its strengths. Use the explorer to compare them, and select a topic.[1, 2, 3]

Card, foam, wood, clay

The staples: MOUNT / mat board and chipboard for clean walls and bases; FOAM BOARD (foamcore) and THERMOCOL for quick light massing; BALSA (cuts easily) and BASSWOOD (holds fine detail); CLAY for moulding volumes; PLASTER OF PARIS for cast elements; and papier-mâché and cork for terrain.[1, 2]

The model-maker's palette mount board foam board balsa / wood acrylic clay / PoP AAC block Traditional ⟶ card, foam, wood, clay, plaster · New-age ⟶ acrylic, polystyrene, AAC, mesh Match the material to the job — quick massing in foam, fine detail in basswood, glazing in acrylic.
DiagramA palette of model materials — board, foam, balsa, acrylic, clay and AAC block
MaterialTypeBest for
Mount / mat boardTraditionalClean walls, bases, presentation models
Foam board / thermocolTraditionalQuick, light massing and study models
Balsa / basswoodTraditionalFrames, fine detail (basswood holds it)
Clay / plaster of ParisTraditionalMoulded volumes; cast elements & terrain
Acrylic / polystyreneNew-ageGlazing; clean-cutting plastic parts
AAC block (Siporex)New-ageSoft, light carved volume studies

Material explorer

Pick a model material to see what it is good for and how it works.

Mount boardTraditional

Works: Easy — knife · Best for: Clean walls, bases, presentation models

Stiff card with a clean coloured face; the staple of crisp presentation models. Cuts cleanly with a sharp blade and steel rule.

Cut, cast, laser

The techniques

Most model work is cutting; casting captures complex form; and laser cutting and 3-D printing sharpen the craft — with care for ventilation and safety.[4, 5, 6]

A clean cut self-healing cutting mat steel rule Sharp blade, steel rule, several LIGHT passes — safer than one heavy cut, and the edge stays square.
DiagramCutting board with a sharp blade and steel rule in several light passes
Casting & moulding the mould pour plaster / resin the cast element Casting captures complex, repeated three-dimensional form that would be slow to cut by hand.
DiagramPlaster poured into a mould to cast a model element
Digital fabrication laser cutting intricate flat parts 3-D printing grows complex parts Cut from a CAD file, print in resin — but ventilate, and never laser PVC. The eye and hand still lead.
DiagramA laser cutter and a 3D printer for digital model fabrication
Generative form

From nature & number

Form can be generated by system and found from nature — Gaudí's hanging models and Frei Otto's soap films let forces shape an efficient structure.[7]

Nature to structure a hanging chain (Gaudí) invert an efficient arch Let forces shape the model — Gaudí's hanging chains and Frei Otto's soap films found structure this way.
DiagramA hanging chain model inverting into an arch — finding structure from natural forces
A flatlay of model materials — mat board, foam, balsa, acrylic and clay.
PhotoA flatlay of model materials — mat board, foam, balsa, acrylic and clay.
A laser cutter cutting intricate model parts from card.
PhotoA laser cutter cutting intricate model parts from card.
Plaster of Paris being cast into a mould for a model element.
PhotoPlaster of Paris being cast into a mould for a model element.
An Indian student cutting foam board with a knife and steel rule on a cutting mat.
PhotoAn Indian student cutting foam board with a knife and steel rule on a cutting mat.
Check your understanding

Self-assessment

1. Which wood is preferred when a model needs fine detail that won't splinter?

2. The safest, cleanest way to cut model board is to:

3. Gaudí's hanging-chain models and Frei Otto's soap-film experiments are examples of:

In a nutshell

Recap

Know the materials — card, foam, balsa/basswood, clay and plaster; acrylic, polystyrene, AAC and mesh.
Cut with a sharp blade in several light passes against a steel rule; mind the grain of balsa.
Cast plaster or resin for complex repeated form; laser-cut and 3-D-print for precise parts.
Let form be generated — by geometry, fractals, parametrics — and found from nature (Gaudí, Frei Otto).
The evidence

References & further reading

  1. [1]Architectural model materials guide — board, foam, wood, plaster, acrylic and their uses. archisoup. https://www.archisoup.com/architectural-model-making-equipment
  2. [2]Model building materials and boards — balsa vs basswood; chipboard; cork. Drafting Supplies. https://draftingsuppliesdew.com/supplies/model-building-materials-and-boards
  3. [3]AAC / Siporex blocks as a soft, light carving medium (used in India as Aerocon). Reference. https://en.wikipedia.org/wiki/Autoclaved_aerated_concrete
  4. [4]Architectural model making — cutting technique, tools and clean edges. howtorhino. https://howtorhino.com/blog/architecture-education/architectural-model-making/
  5. [5]The art of plaster casting and moulding for models. WR-AP. https://www.wr-ap.com/post/the-art-of-plaster-casting-and-its-many-forms
  6. [6]Laser cutting and 3-D printing safety / ventilation in fabrication. MIT EHS. https://ehs.mit.edu/wp-content/uploads/MITEHS_Laser_Cutter_Guidance.pdf
  7. [7]Biomimicry, hanging models and form-finding — Gaudí and Frei Otto. Architizer. https://architizer.com/blog/inspiration/stories/biomimicry-and-parametricism-gaudi-and-hadids-design-legacy/

Further reading

  • Knoll, W. & Hechinger, M. (2007). Architectural Models: Construction Techniques (2nd ed.). J. Ross Publishing.
  • Werner, M. (2010). Model Making (Architecture Briefs). New York: Princeton Architectural Press. ISBN 978-1-56898-870-2.
  • Mills, C.B. (2011). Designing with Models: A Studio Guide to Architectural Process Models (3rd ed.). Wiley.

Sources gathered and fact-checked June 2026. Published values vary by source, sample and method — treat as indicative and confirm against the cited standard before structural use.