Challenge 3
Wood You Believe We Can Grow a Home?
Explore plants and crops used to create building materials — from cedar longhouses to modern timber frame.
The NASEF Prompt
"Explore plants and crops that are used to create the building materials for homes or other buildings. Research what these crops are, how they are cultivated, and how they are turned into materials for construction."
In the Pacific Northwest, you do not need to "grow" building materials — the forest grows them for you. The question is how you manage the forest, how you harvest, and what engineering traditions you draw from. Our answer begins with ten thousand years of Coast Salish architecture.
Pacific NW Building Traditions
The forests of the Pacific NW provided everything needed for shelter. The building traditions that emerged here are feats of engineering, art, and ecological thinking.
Western Red Cedar Longhouses
The cedar longhouse is the defining architectural achievement of the Pacific NW Coast peoples. These structures could be 60 to 100+ feet long, 30 to 40 feet wide, and housed multiple families of a clan. Built without metal tools, nails, or mortar.
Engineering
- Post-and-beam frame: Massive cedar posts (up to 3 feet diameter) set in post holes, supporting ridge beams and purlins
- Plank walls: Split cedar planks lashed between pairs of poles — removable and rearrangeable
- Shed roof or gabled: Overlapping cedar planks, some with adjustable smoke holes
- No nails or fasteners: Entire structure held by gravity, mortise joints, and lashing
- Modular design: Wall planks could be removed and carried to seasonal camp sites
Cultural Significance
Longhouses were not just shelter — they were the social, ceremonial, and political center of a village. Interior space was organized by family rank. Carved house posts told clan histories. The longhouse was the community itself made physical.
Dimensions
- Length: 60-120 ft (18-36 m)
- Width: 30-40 ft (9-12 m)
- Height: 12-15 ft (3.5-4.5 m)
- Capacity: 6-12 families
- Lifespan: 100+ years
Material Properties
- Naturally rot-resistant (thujaplicin)
- Lightweight for its strength
- Splits cleanly along grain
- Insulating (low thermal conductivity)
- Aromatic (insect repellent)
Douglas Fir Structural Timber
Douglas fir (Pseudotsuga menziesii) is the structural powerhouse of the Pacific NW forest. Where cedar provides rot-resistance and workability, Douglas fir provides raw strength. It has one of the highest strength-to-weight ratios of any wood species.
Traditional Uses
- Ridge poles for longhouses
- Canoe cross-pieces
- Fish trap frameworks
- Fuel wood (hot, long-burning)
Modern Uses
- Framing lumber (#1 in North America)
- Glulam beams and CLT panels
- Plywood and engineered wood
- Mass timber construction
Key Properties
- Bending strength: 12,400 psi
- Grows to 250+ ft tall
- Lifespan: 500-1,000 years
- Fire-resistant bark at maturity
Tule Mat Houses
Not all Pacific NW architecture was permanent. Tule mat houses were portable, seasonal shelters used by the inland Salish peoples (Yakama, Klickitat, Puyallup for seasonal camps). A pole frame was covered with woven tule mats that could be rolled up and carried.
Design Principles
- Portable: Mats rolled up, poles left at campsite for reuse
- Modular: Add or remove mats to adjust size
- Insulating: Tule traps air; double-layer mats for winter
- Water-resistant: Overlapping layers shed rain effectively
- Breathable: Allows air circulation, reducing condensation
Modern Relevance
The tule mat house is a prototype for modular, portable shelter. Its design principles — lightweight, insulating, water-resistant, assembled without tools — align directly with modern emergency shelter research. What if we designed modern modular housing on these principles?
Bent-Wood Box Technology
The bent-wood box (also called a kerfed box) is one of the most ingenious woodworking technologies in the world. A single plank of cedar is kerfed (grooved) at three points, steamed, and bent into a box shape. The fourth corner is pegged or sewn. The bottom is fitted and sealed with fish glue.
Construction Process
- Select and split a single cedar plank
- Kerf (V-groove) three bending lines
- Steam the plank to soften wood fibers
- Bend at each kerf to form three corners
- Join fourth corner with pegs, stitching, or glue
- Fit and seal the bottom panel
Uses
- Food storage (watertight, pest-resistant)
- Cooking vessels (hot stones dropped in water)
- Burial boxes and ceremonial containers
- Trade goods (decorated boxes as currency)
- Furniture and household storage
Bark Roofing & Wall Materials
Beyond cedar planks, bark itself served as a critical building material. Large sheets of bark from cedar, hemlock, and birch were used for roofing, wall cladding, and temporary shelters.
- Cedar bark sheets: Peeled in large sections for roof shingles; naturally waterproof and long-lasting
- Hemlock bark: Used for temporary lean-to shelters and fish-drying sheds
- Layering technique: Multiple layers overlapped like modern shingles, with gravity and weight holding them in place
- Insulation: Shredded bark packed between wall layers for thermal mass
Agroforestry & Managed Forests
The Pacific NW forests were not "wild" — they were managed through fire, selective harvesting, and cultivation. This is agroforestry: agriculture integrated with forestry.
Indigenous Forest Management
- Controlled burning: Cleared underbrush, promoted new growth, maintained prairies and berry fields
- Selective harvest: Taking only what was needed; leaving seed trees and young growth
- Coppicing: Cutting trees to encourage straight regrowth for poles and planks
- Culturally modified trees: Bark stripping, plank splitting, and test holes that trees survived for centuries
Modern Sustainable Forestry Parallels
- Mass timber (CLT): Cross-laminated timber as a concrete/steel replacement
- Bamboo construction: Fast-growing grass used structurally (global comparison)
- Hempcrete: Hemp fiber mixed with lime for insulating wall panels
- FSC certification: Modern attempt at sustainable harvest (echoing Indigenous practice)
Tacoma Water Neighborhoods
The Water Neighborhoods concept reimagines buildings not as isolated structures but as infrastructure nodes within living watersheds. Every building collects, filters, stores, and distributes water. Every roof is a garden. Every wall breathes.
Roof as Watershed
Green roofs capture rainwater, filter it through living soil, and channel it to cisterns. Inspired by the moss-covered canopy of the old-growth forest.
Walls as Air Filters
Living walls and breathable materials exchange CO2 for oxygen. The longhouse plank wall — permeable, adjustable — is the precedent.
Foundation as Mycelium
Building connections mirror fungal networks: shared resources, mutual support, distributed resilience. No building stands alone.
This is the vision our Minecraft shelter build works toward: not just "what crops make building materials" but "how do buildings participate in the living systems around them."
Minecraft Build Guide: Longhouse Construction
Step-by-step guide to building a Coast Salish longhouse in Minecraft:
Foundation & Posts
Place stripped spruce logs as main posts in a rectangle (at least 15x7 blocks). Posts should be 5-6 blocks tall. Use dark oak for the larger center posts. Dig 1 block into the ground for post holes.
Ridge Beam & Purlins
Connect the top of center posts with stripped spruce logs as the ridge beam. Add purlins (horizontal beams) from ridge to wall top. Use spruce logs for structural beams, stripped logs for visible framing.
Plank Walls
Fill walls with spruce planks. Leave gaps or use fence gates for doorways. For the removable plank effect, alternate between planks and trapdoors. Add wooden buttons as pegs.
Roof
Use spruce slabs and stairs for a gently sloping shed roof. Leave a gap along the ridge for a smoke hole. Place campfires below for visible smoke rising through the opening.
Interior
Create family sections with beds, storage (barrels and chests), and central fire pits (campfires). Use item frames with tools. Add banner designs on walls for clan crests. Place armor stands for carved house posts.
Surrounding Landscape
Plant spruce and dark oak trees around the longhouse. Add a water source (river or beach) nearby. Build fish drying racks, canoe storage, and a managed forest area showing selective harvest and coppicing.
Bonus: Tule Mat Shelter
Build a smaller A-frame structure using fence posts and green/brown carpet draped over them. Place it near a seasonal camp area (fishing weir, berry patch). This contrasts the permanent longhouse with portable seasonal shelter.
TEK8 Petals for This Challenge
The building craft itself. Post-and-beam engineering, plank splitting, bent-wood box construction, steaming and bending. Fire is both tool (steaming wood) and design element (smoke holes, fire pits).
Activities: Simple joinery projects, plank splitting demonstrations, model longhouse construction, bent-wood experiments
Agroforestry as garden. Managing the forest is gardening on a landscape scale. Controlled burns, selective harvest, coppicing — the forest as a cultivated garden of building materials.
Activities: Tree species identification, growth ring counting, forest management planning, nursery planting
Gathering materials from the forest. Reading the landscape for the right tree, the right bark, the right tule patch. Understanding what the land offers before you build.
Activities: Forest walks for material identification, bark texture rubbings, wood hardness testing, CMT surveys
Resources & Citations
Cedar Longhouse Architecture
Hilary Stewart, "Cedar: Tree of Life to the Northwest Coast Indians"; Wayne Suttles, "Handbook of North American Indians: Northwest Coast"; Burke Museum longhouse documentation
Bent-Wood Box Technology
Bill Holm, "Spirit and Ancestor"; Royal BC Museum collections; Museum of Anthropology at UBC bent-wood box research
Managed Forests & Agroforestry
M. Kat Anderson, "Tending the Wild"; Nancy Turner, "The Earth's Blanket"; Douglas Deur & Nancy Turner, "Keeping It Living"
Mass Timber & Modern Wood Construction
WoodWorks mass timber resources; CLT Handbook (FPInnovations); Timber Building Magazine; APA – The Engineered Wood Association