For most Indian homeowners and developers, a building means a reinforced concrete frame with brick or block infill. Wood is something that goes inside — doors, wardrobes, flooring, perhaps a pergola. Yet over the last three decades a family of engineered wood products known as mass timber has changed what wood can do structurally. Panels of cross-laminated timber, beams of glued-laminated timber and sheets of laminated veneer lumber now form the floors, walls and frames of apartment blocks, offices and towers in Europe, North America, Japan and Australia. Some of these buildings are taller than any brick or stone building in most Indian cities.
The question Indian architects, students and clients increasingly ask is whether this will happen here. The arguments for it are real: mass timber is light, fast to erect, precise because it is made in a factory, and it stores carbon rather than emitting large amounts of it the way cement and steel production does. The arguments against are just as real in the Indian context: a humid monsoon climate, termites, a limited domestic supply of certified structural timber, building codes and fire rules written around concrete and steel, and a construction industry whose cost structure is built on cheap site labour rather than prefabrication.
This article explains what mass timber is and how its main products are made, looks at a handful of landmark buildings with facts that are well documented, examines the honest concerns — fire, moisture, termites, acoustics and cost — and then describes, qualitatively, where Indian codes and industry stand. It ends with a practical view of where wood structures make sense in an Indian project today, and which signals to watch over the next decade.
What mass timber means
Mass timber is not a single material. It is a group of engineered wood products in which many smaller pieces of wood — boards, veneers or strands — are bonded or fastened together into large structural members. The idea is old: glued-laminated beams were used in Europe from the late nineteenth and early twentieth centuries. What changed from the 1990s onwards was industrial production of large panels, reliable structural adhesives, computer-controlled cutting and a body of fire and structural testing that let engineers design taller buildings with confidence.
The key product is cross-laminated timber, usually shortened to CLT. A CLT panel is made of layers of kiln-dried softwood boards — commonly spruce, fir, pine or larch — with each layer laid at right angles to the one below it, glued across its full face and pressed. Because the grain alternates, the panel is stable in both directions and can span like a slab or stand like a wall. It behaves less like a plank and more like a thick, dimensionally stable sheet of plywood, which is why it can replace a concrete slab or a load-bearing wall.
| Product | How it is made | Typical form | Main structural use | Closest Indian analogue |
|---|---|---|---|---|
| CLT (cross-laminated timber) | Odd number of board layers (3, 5, 7) glued at 90° to each other | Panels roughly 60–320 mm thick, up to about 3 m wide | Floor and roof slabs, load-bearing walls, lift and stair cores | A giant structural plywood |
| Glulam (glued-laminated timber) | Boards glued with the grain parallel, finger-jointed for length | Beams and columns, straight or curved | Columns, long-span beams, arches, roof trusses | Laminated timber beams in resorts and halls |
| LVL (laminated veneer lumber) | Thin veneers glued with the grain mostly parallel | Beams, studs, panels | Headers, beams, I-joist flanges | Engineered veneer beams (limited local production) |
| NLT and DLT (nail- and dowel-laminated timber) | Boards on edge joined by nails or hardwood dowels | Decks for floors and roofs | Floor and roof decks; DLT has no glue or metal | Traditional nailed timber decking |
| Mass plywood panels | Many veneer layers built up into thick panels | Large panels | Walls and floors | Thick structural plywood |
| Engineered bamboo (research and early products) | Bamboo strips or strands glued and pressed | Boards, beams, panels | Mostly non-structural; structural use being researched | Bamboo flooring and laminates |
Two numbers explain much of mass timber's appeal. The first is weight. Softwood CLT has a density of roughly 450–500 kg per cubic metre, against about 2400 kg for reinforced concrete — so a timber floor of similar span is a fraction of the weight. Lighter floors mean smaller foundations, which matters on weak soils, on rooftop extensions over existing buildings, and in seismic design, where lower mass attracts lower earthquake forces. The second is carbon. Dry wood is about half carbon by mass, absorbed by the tree as carbon dioxide while it grew. A cubic metre of softwood at around 500 kg therefore holds roughly 250 kg of carbon, equivalent to a little over 0.9 tonnes of carbon dioxide, for as long as the wood is kept in use and not burned or left to rot. That storage only counts as a climate benefit when the forest it came from is managed and replanted.
From glulam to tall timber: five landmark buildings
CLT was developed in Austria and Germany in the 1990s, building on centuries of central European carpentry and on earlier glulam technology. Through the 2000s, design guides, product approvals and fire tests accumulated, and architects began to build higher. The buildings below are among the most widely cited milestones. Each one proved something different, and together they show how the industry learnt to combine timber with concrete where concrete still does a job better.
| Building | Place and completion | Storeys | Structural idea | What it proved |
|---|---|---|---|---|
| Stadthaus, Murray Grove | London, UK — 2009 | 9 | CLT walls, floors, stair and lift cores above a concrete podium | A residential block of this height can be built almost entirely in CLT, quickly and quietly in a dense city |
| Brock Commons Tallwood House | University of British Columbia, Vancouver — 2017 | 18 | CLT floor panels on glulam columns, with two concrete cores | A hybrid tall timber residence can be erected very fast once the cores are up |
| Mjøstårnet | Brumunddal, Norway — 2019 | 18 (about 85 m) | Glulam columns, beams and large diagonal trusses; CLT for stairs and lift shafts | Timber itself can provide stability to a tall building through trusses |
| Ascent | Milwaukee, USA — 2022 | 25 (about 87 m) | Mass timber floors and columns above a concrete podium, with concrete cores | Building codes can be revised to allow tall timber with defined fire protection |
| International Building Code 2021 revision | USA (model code) | Up to 18 in the tallest new type | New construction types IV-A, IV-B and IV-C for tall mass timber | A national model code can write timber height limits around fire testing rather than habit |
The pattern behind these buildings is instructive for India. None of them treated timber as a romantic material; each was a carefully engineered system, designed by teams who planned fire protection, moisture protection during construction, acoustic separation and the connection details from the start. Most of the tallest examples are hybrids, using concrete for podiums, cores or the topmost slabs where mass, stiffness or fire separation is needed. The lesson is not that wood replaces concrete, but that each material can be put where it works best.
How a mass timber building is put together
Three structural systems dominate. The first is the panel or platform system, in which CLT walls carry CLT floors storey by storey, much like a load-bearing masonry building but made of large factory-cut panels; it suits apartments, hostels and hotels with repeated room layouts. The second is post-and-beam, in which glulam columns and beams form a frame and CLT or other timber decks span between them; it gives open floors for offices, schools and retail. The third is the hybrid, in which a concrete core and sometimes a concrete podium provide stability, fire-separated escape routes and service space, while timber forms the floors and frame elsewhere. Hybrids are where most of the tall-building activity sits.
The section in Fig. 3 shows why a timber floor is never just timber. The CLT panel carries the load and, if left exposed, forms the ceiling below. Above it sits a resilient layer and a screed or thin concrete topping, which add the mass a light timber floor lacks and so reduce footstep and airborne noise between flats. Services usually run in the screed, in a raised floor, or exposed below the soffit; they cannot be chased into the panel freely the way an electrician chases a brick wall in India, so routes must be fixed before the panels are cut. In practice CLT panels of about 160–200 mm commonly span somewhere around 4–6 m for homes and offices, but the engineer decides the panel and span from the loads, deflection, vibration and fire rating — these are indicative figures, not design values.
| Aspect | Mass timber (CLT + glulam) | Reinforced concrete frame | Structural steel frame |
|---|---|---|---|
| Self-weight of a floor | Low — roughly a fifth to a quarter of an equivalent concrete slab | High | Medium (with a concrete deck) |
| Speed on site | Fast — factory-cut panels, few wet trades | Slower — formwork, curing, propping | Fast frame; deck and fireproofing follow |
| Precision | Millimetre-level CNC cutting | Depends on site formwork | High |
| Fire | Chars at a predictable rate; large sections keep strength | Non-combustible; spalling at high temperature | Loses strength quickly; needs fire protection |
| Moisture and termites | Must be kept dry and protected — the critical Indian issue | Largely unaffected | Corrosion must be protected |
| Acoustics | Needs added mass or layers between flats | Good inherent mass | Depends on the deck |
| Embodied carbon | Generally lower, with stored biogenic carbon if sourced from managed forests | High, mainly from cement | High, mainly from steel production |
| Indian supply and skills | Mostly imported panels; few specialist erectors | Everywhere, cheap labour | Widely available |
Fire: why a big timber section does not simply burn away
The first question every Indian client asks about a wooden building is fire, and it is the right question. Timber is combustible. But large timber sections behave very differently in fire from the thin sticks of a bonfire. When the surface of a thick glulam column or CLT panel is exposed to fire, it forms a layer of char. The char insulates the wood behind it, slowing heat transfer, and the core remains cool and keeps much of its strength. The rate at which the char front moves inward is predictable: European design rules in Eurocode 5 use values of roughly 0.65–0.8 mm per minute for softwood glulam and solid timber under standard fire exposure. Engineers design the member so that the section left after the required fire period can still carry the load.
Two further measures complete the fire strategy. Encapsulation covers some or all timber surfaces with fire-rated gypsum board so that the wood does not contribute to the fire for a set period; tall-timber codes often require more encapsulation as height increases and allow more exposed timber in lower buildings. Active protection — sprinklers, detection, compartmentation and protected escape stairs — is treated as essential in tall timber, just as it is in tall concrete buildings. Connections need special care because steel plates and bolts conduct heat into the wood; they are usually recessed, covered or oversized. The adhesive matters too: CLT products are tested to make sure layers do not delaminate and fall away in a way that would expose fresh wood faster than designed.
For India, the honest position is that fire approval for a multi-storey timber structure would be an engineered, case-by-case exercise. The National Building Code of India 2016, Part 4, classifies buildings by occupancy and construction type and controls the combustibility of materials, escape routes and fire separation; it was not written with tall mass timber in mind. Any project beyond a low-rise building would need a fire engineer, a structural engineer familiar with timber, and early discussion with the local fire authority.
Moisture, termites and acoustics: the Indian climate test
In northern Europe the main enemy of a timber building is rain during construction. In much of India the list is longer: monsoon rain for three to four months, high humidity in coastal cities like Surat and Mumbai, large daily temperature swings in dry regions, and subterranean termites almost everywhere. Kiln-dried CLT is delivered at about 12 per cent moisture content. If it is allowed to sit in rain, absorb water at the panel ends or stay wet behind a facade, it swells, checks (cracks along the grain) and, in the worst case, decays. Fungal decay needs wood moisture content above about 20 per cent for a sustained period, so the design aim is simple to state: keep the wood dry, and let it dry out quickly if it does get wet.
| Risk | Where it bites in India | Detailing response |
|---|---|---|
| Monsoon rain during erection | Coastal and western ghats regions, June–September | Schedule erection in the dry season, temporary roofs, sealed panel ends, membranes on floors |
| Rising damp and splash | Ground floors, plinths, verandahs | Keep timber on a concrete or masonry plinth well above ground; damp-proof course; no timber in contact with soil |
| Subterranean termites | Almost all of India | Anti-termite soil treatment (as for any building), physical barriers, no buried wood, inspectable gaps, treated or naturally durable timber where codes allow |
| Wet rooms | Bathrooms and kitchens | Waterproofed concrete or composite pods, leak detection, no timber below shower trays |
| High humidity and air-conditioning | Coastal cities with long AC seasons | Control condensation in walls and roofs with correct vapour control and ventilation |
| Facade exposure | West and south walls in strong sun and rain | Ventilated cladding in front of the timber, deep overhangs, no exposed structural timber on weather faces |
| Footstep and airborne noise | Apartments and hotels | Screed or concrete topping, resilient layers, suspended ceilings where needed |
Termites deserve a separate word. India's subterranean termites forage from the soil and can travel through cracks, conduits and joints into a building. Indian practice already treats soil under and around every new building to IS 6313 before construction, and timber used in buildings is protected to IS 401 where required. A mass timber building in India would need those measures plus physical design: a non-timber ground floor or plinth, no concealed timber cavities that cannot be inspected, and a maintenance plan. None of this is impossible — traditional timber buildings in Kerala, the hill states and the north-east have lasted generations with raised plinths, wide overhangs and good ventilation — but it must be designed, not hoped for.
Where India stands: codes, supply and skills
India has a long timber tradition — the carved havelis and pols of Gujarat, the nalukettu houses and temple roofs of Kerala, the timber-laced kath-kuni walls of Himachal Pradesh, the bamboo houses of the north-east — and a structural timber code. The National Building Code of India 2016, Part 6 (Structural Design), Section 3 covers timber and bamboo, and IS 883 gives the design of structural timber. These documents are written mainly around sawn timber, traditional connections and lower-rise buildings. At the time of writing, there is no widely adopted Indian standard dedicated specifically to the design of CLT buildings, so engineers who use it in India generally refer to the European product standard for CLT (EN 16351) and Eurocode 5, or to North American standards such as ANSI/APA PRG 320, alongside Indian codes, and seek the approval of the local authority for the specific project.
Supply is the second constraint. CLT and large glulam need large volumes of straight, kiln-dried, stress-graded softwood or suitable plantation timber, glued in a factory with structural adhesives and tested for quality. India imports much of its structural timber, and its plantation species — eucalyptus, poplar, rubberwood, Melia dubia and others — are widely used for plywood and veneer but are not yet established as graded structural lamella stock for CLT. Glulam fabricators exist in India and engineered timber roofs appear on resorts, clubhouses and pavilions, but large CLT presses are rare to absent. Most mass timber in India today would therefore be imported panels, with freight, duty, currency risk and long lead times attached.
Skills are the third. A CLT building is assembled like furniture at building scale: crane, a small trained crew, precise anchors, screws and brackets, and tight tolerances on the concrete it sits on. Indian sites are organised around large teams of masons, bar-benders and carpenters working on wet trades. Architects, structural engineers, fire engineers and contractors would all need training and a few reference projects before costs and risks become predictable.
| Factor | Status in India (qualitative) | What would change it |
|---|---|---|
| Structural code | NBC 2016 Part 6 Section 3 and IS 883 cover timber generally; no dedicated CLT design standard widely used | A BIS standard or NBC provisions for engineered mass timber |
| Fire rules | Written around non-combustible construction for taller buildings; timber needs case-by-case approval | Tested Indian provisions for encapsulation, heights and occupancies |
| Panel supply | Largely imported; very limited domestic CLT production | Domestic presses using certified plantation timber or bamboo |
| Certified forests | Some certified plantations; most timber imported | Larger certified plantation base and chain-of-custody systems |
| Cost | Higher than RCC for most projects once import costs are included | Local production, scale, and credit for speed and lighter foundations |
| Skills | Few specialist designers and erectors | Training, reference projects, manufacturer-led installation |
| Demand | Interest from hospitality, institutions and green-building clients | Embodied-carbon targets in green ratings and public procurement |
Where wood structures make sense in an Indian project today
Mass timber in India will not begin with 20-storey towers. It is far more likely to grow from projects where its advantages are obvious and its risks are easy to manage. Hill-station and forest resorts, where access is difficult, wet trades are slow and a light, prefabricated structure saves months; long-span roofs over clubhouses, banquet halls, sports halls and school assembly spaces, where glulam beams give a warm interior and a long clear span; pavilions, sales galleries and exhibition structures that may be dismantled and reused; rooftop additions over existing concrete buildings, where a lighter structure may avoid strengthening the frame below; and hybrid buildings where a concrete podium and core carry the risky parts and timber forms the upper floors or the roof.
Inside, the picture is easier still. Exposed CLT or glulam ceilings, timber stair structures and wall linings bring the look and feel of mass timber into concrete buildings without changing the structural system, though fire classification of exposed finishes still has to be checked for the occupancy. For clients drawn to wood, Aaditya Interior usually suggests starting there — a glulam roof over a double-height space, or an engineered timber ceiling — rather than with a structural experiment that the local supply chain cannot yet support.
| Application in India | Feasibility today | Key condition |
|---|---|---|
| Glulam roof over a clubhouse, hall or villa living room | Good | Fabricator experience, protected from rain, treated against termites |
| Resort cottages and hill-station villas (1–2 storeys) | Good to fair | Raised plinth, deep overhangs, dry-season erection, local approval |
| Pavilions, sales galleries, temporary structures | Good | Design for disassembly and reuse |
| Rooftop addition over an RCC building | Fair | Structural check of existing frame; fire separation from floors below |
| School or office, 2–4 storeys, hybrid | Fair (case by case) | Fire engineering, imported panels, specialist erector |
| Mid-rise apartments (5–10 storeys) | Low for now | Code provisions, acoustic and fire testing, local panel supply |
| High-rise towers | Not yet realistic | Everything above, plus market confidence |
The future: what to watch over the next decade
Several trends could move mass timber from curiosity to option in India. Green-building ratings and large corporate clients are beginning to count embodied carbon, not only operational energy, and the cement and steel in a concrete frame make up a large share of a building's embodied carbon. Research institutions in India have long worked on wood and bamboo — the Indian Plywood Industries Research and Training Institute and the Institute of Wood Science and Technology among them — and engineered bamboo is a natural candidate for an Indian mass material, since bamboo grows quickly and is abundant in the north-east. Prefabrication is spreading in Indian construction through precast concrete and light steel; the same logistics and crane-based assembly would help timber. And international hotel and resort operators, who already build in timber elsewhere, may bring the specifications with them.
Against this, the practical brakes are strong: a cost gap that will remain until panels are made locally, codes that need years of testing and committee work to change, and the climate and termite risks that demand careful detailing every time. The most likely path is gradual — more glulam roofs and timber interiors first, then low-rise hybrid buildings in hospitality and education, and only later, if at all, mid-rise housing. Anyone claiming that Indian cities will soon be full of timber towers is ahead of the evidence.
Rules for considering mass timber on an Indian project
- Start with the reason: speed, low weight, carbon or the look of wood. If none applies strongly, concrete is usually simpler in India today.
- Appoint a structural engineer with timber experience and a fire engineer at concept stage, not after the design is drawn.
- Talk to the local authority and fire department early; expect a case-by-case approval for anything beyond a low-rise building.
- Keep timber off the ground: a concrete or masonry plinth, a damp-proof course and anti-termite treatment to IS 6313 as for any building.
- Plan erection for the dry season and protect panels, panel ends and floors from rain until the building is closed.
- Fix service routes before panels are cut; timber cannot be chased freely like brick.
- Add mass or layers to floors between separate homes or hotel rooms to control footstep noise.
- Ask for certified timber with chain-of-custody documents; the carbon argument depends on responsibly managed forests.
- Budget for import freight, duty, lead time and a specialist erection crew, and compare against the time saved on site.
Frequently asked questions
What is CLT in construction?
CLT, or cross-laminated timber, is a large structural panel made of an odd number of layers of kiln-dried boards, each layer glued at right angles to the one below. It is used for floors, roofs and load-bearing walls, typically in thicknesses of about 90–280 mm, and is cut to size by CNC machines in the factory before delivery to site.
Are timber buildings safe in a fire?
Properly designed mass timber buildings are designed to meet fire-resistance requirements. Thick timber chars at a predictable rate — Eurocode 5 uses roughly 0.65–0.8 mm per minute for softwood — and the char protects the core. Designs add gypsum encapsulation, sprinklers, compartmentation and protected escape routes. Thin, light timber framing behaves very differently and should not be compared directly.
Is CLT available in India?
CLT is available in India mainly as imported panels supplied for specific projects, and domestic production is very limited. Glulam fabrication exists locally and is used for roofs and pavilions. Prices are quoted project by project and depend heavily on freight, duty and exchange rates, so there is no stable per-square-foot market rate yet.
Will termites eat a CLT building?
Termites can attack any untreated wood in contact with soil or damp masonry. A timber building in India needs the same soil anti-termite treatment as any building (IS 6313), a non-timber plinth and ground floor, no buried or concealed wood that cannot be inspected, suitable preservative treatment where specified, and periodic inspection.
Is a wooden building cheaper than an RCC building in India?
Usually not today. Imported panels, specialist erection and engineering make the structure more expensive than a conventional RCC frame for most Indian projects. Savings can come from faster construction, lighter foundations and less finishing where timber is left exposed, but these rarely close the gap yet except in remote or time-critical projects.
Sources & standards
- Bureau of Indian Standards — National Building Code of India 2016, Part 4 (Fire and Life Safety) and Part 6 (Structural Design), Section 3: Timber and Bamboo
- Bureau of Indian Standards — IS 883 (design of structural timber in building), IS 401 (preservation of timber), IS 6313 (anti-termite measures in buildings)
- CEN — EN 1995-1-1 and EN 1995-1-2 (Eurocode 5: design of timber structures, including structural fire design); EN 16351 (cross laminated timber)
- APA — ANSI/APA PRG 320, Standard for Performance-Rated Cross-Laminated Timber
- International Code Council — International Building Code 2021, construction types IV-A, IV-B and IV-C (tall mass timber)
- Published project descriptions from the owners and designers of Murray Grove (London), Brock Commons Tallwood House (UBC), Mjøstårnet (Brumunddal) and Ascent (Milwaukee)
- Indian Plywood Industries Research and Training Institute and Institute of Wood Science and Technology — research on Indian wood and bamboo products
