The Roofing Knowledge HubVolume 1 · Issue 2 · July 2026
Building & envelope
Roofing, in Plain Language
The roof is the hardest-working part of a building — it keeps the monsoon out, holds the heat off, carries its own weight and shapes the whole house — and the one most people think about least, until it leaks. This is the literacy library that makes it clear: the shapes and materials, how to design and plan a roof, match it to your climate, and renovate an old one. A guide to understanding, planning and specifying — structure, waterproofing and work at height belong to qualified professionals.
The Ultimate Guide to Roofing Systems
The one guide that makes roofing make sense — the five jobs a roof does, the three shapes (flat, sloping, terrace), the material families, the layers that keep water out and heat off, and how to choose the right roof for an Indian home.
Read itThe master guides
Design, plan, climate-match & renovate
For the home01The Complete Guide to Residential Roof Design
How to design a roof for a home from first principles — choosing the shape for your site and climate, the structure, the eaves and overhangs that tame Indian sun and rain, slope, drainage, waterproofing, insulation, terrace use and a solar- and rainwater-ready roof.
New homes02Roof Planning Guide for New Homes
The decisions to lock in before the roof slab is cast — loads and future floors, slope and drain outlets, service penetrations, waterproofing and insulation, solar and rainwater readiness, parapet and terrace access. Plan before you pour, because after it everything gets expensive.
Climate-matched03Roof Selection Guide for Indian Climates
India is five climates, not one — hot-dry, warm-humid coastal, composite, cold and the monsoon coast. Each needs a different roof shape, material, slope and detailing. A plain-language, zone-by-zone guide to matching the roof to the weather.
Renovation04The Roof Renovation & Replacement Guide
When to fix, when to re-do and when to tear off an ageing Indian roof — reading the warning signs, making the repair-vs-replace call, re-waterproofing a tired RCC terrace, re-roofing a sloping roof, and hiring a contractor you can trust.
Roof types & shapes
Flat, sloping & terrace — and every form
Flat roofs05The Flat Roof Design Guide
The flat roof is India's default urban roof — a usable RCC deck that stacks for future floors. But it is never truly flat: it lives or dies by the fall that drains it and the waterproofing that seals it. A plain-language design guide.
Sloping roofs06The Sloping Roof Design Guide
The pitched roof beats water by gravity — ideal for Kerala, the Konkan and the hills. How to choose the pitch by material and rainfall, design the truss or rafter structure, pick tiles vs metal, and detail the underlay, battens, ridges, valleys, eaves and cavity ventilation.
Terraces07The Terrace Roof Design Guide
How to design a flat roof to be genuinely used as a terrace — waterproofing and drainage that survive foot traffic, terrace flooring, parapet safety, planning zones for garden, sit-out and utility, and the extra loads a lived-on roof carries. India-grounded.
Flat vs sloping08Flat Roof vs Sloping Roof: Which Is Right for You?
Flat roof or sloping roof? The one decision that shapes the whole house. A decisive, balanced, India-grounded comparison across cost, rain, heat, usable space, maintenance, looks, future floors and solar — with a clear verdict for your situation.
Roof shapes09A Guide to Roof Shapes: Gable, Hip, Shed & More
Shed, gable, hip, half-hip, gambrel, mansard, butterfly, sawtooth and combination — a plain tour of the common sloping-roof shapes, what each does well, how it sheds water and meets wind, and which one suits an Indian home.
Special forms10Special Roof Forms: Domes, Vaults, Shells & Membranes
Beyond flat and pitched roofs lie the engineered forms — domes, barrel vaults, folded plates, thin-shell concrete, tensile membranes, space frames and cable roofs that span auditoriums, stadiums, airports and temples. What each is, how it carries load, and why every one needs a structural engineer.
Materials & structure
What the roof is made of — RCC, tiles, metal & more
RCC / concrete11The RCC Roof Guide
The RCC roof is urban India's default flat roof. What reinforced cement concrete is, the slab types (one-way, two-way, flat, waffle, filler), why grade, cover and curing decide its life, the problems that plague it, and why waterproofing is never optional.
Clay tiles12The Clay Roof Tiles Guide
Fired-clay roof tiles stay cool, breathe and last generations — the classic wet-region roof. The main types (Mangalore, country Nattu, pan, flat, ridge), clay versus concrete, how tiles lay on battens and underlay, the minimum pitch, and safe maintenance.
Metal13The Metal Roofing Guide
Metal roofing is the fast, light, long-spanning choice for sloping roofs, sheds, hills and industry. The material families, profiles and coatings — and the four India issues that decide whether it lasts: coastal corrosion, condensation, rain noise and heat.
Sheets14The Roofing Sheets Guide (Non-Metal)
The light, cheap, quick non-metal sheets that roof India's verandahs, porches and sheds — fibre-cement, polycarbonate, FRP, PVC/uPVC, bituminous and translucent daylighting sheets. What each is, its light, cost, lifespan, strengths, weaknesses, best use, and the fragile-roof safety they all demand.
Traditional15Traditional Indian Roofing Materials
India's vernacular roofs — country clay tiles, the Madras terrace, lime and brick-bat coba, thatch, timber shingles, bamboo, stone slabs and mud roofs — region by region: how each works, its climate logic, its honest maintenance cost, and its low-carbon relevance today.
Tile vs metal16Tile Roof vs Metal Roof: Which Should You Choose?
Tile roof vs metal roof, settled for an Indian home. A decisive head-to-head on cost, lifespan, weight, heat, rain noise, looks, speed, span, coastal corrosion, repair and resale — with a clear choose-tile-if and choose-metal-if verdict.
Waterproofing & drainage
Beating the monsoon — keep water out, move it off, harvest it
Waterproofing17The Roof Waterproofing Guide
Keeping water out is a roof's single most important job. The waterproofing systems compared, the critical details that decide success or failure, surface prep and flood testing, and new-roof versus existing-roof strategies — India-grounded.
Terrace waterproofing18Flat Roof & Terrace Waterproofing
The flat RCC terrace is India's most common roof and its most common leak. Why flat roofs are hardest to waterproof, traditional brick-bat coba and china-mosaic versus modern membranes and liquid coatings, the fall-to-drain and layered build-up, and re-doing a leaking terrace.
Drainage19The Roof Drainage Guide
Roof drainage is getting rainwater off the roof fast and completely — the first defence against leaks, before waterproofing. The slope, gravity vs siphonic systems, outlets, scuppers, gutters and downpipes, sizing to monsoon rainfall, emergency overflow and ponding, and the link to rainwater harvesting.
Gutters & downpipes20Roof Gutters & Downpipes
Gutters catch the rain running off a sloping roof and downpipes carry it to the ground, drain or rainwater tank. Gutter and downpipe types, the material choice for Indian rain, sizing to roof area and rainfall, leaf guards, and the monsoon-prep job of keeping them clean.
Rainwater harvesting21Rooftop Rainwater Harvesting
The rain on your roof is free water and, in most Indian cities, a legal duty. What rooftop rainwater harvesting is, the two paths (store or recharge), the parts that make it work, how much a roof collects, and the upkeep that keeps it honest.
Leaks & repair22Roof Leak Diagnosis & Repair
A leaking roof is the homeowner's most common crisis. Read the signs, understand why the leak is rarely above the stain, learn where roofs actually leak, how leaks are traced, monsoon fixes vs permanent repair, and where the safe DIY line stops.
Thermal, cool, green & solar
Beat the heat, grow it green & harvest the sun
Insulation23The Roof Insulation Guide
The roof is the biggest heat collector on an Indian home. How insulation works, U-value and R-value made simple, where to insulate, the materials compared, how thick to go against Eco Niwas Samhita targets, and how to retrofit an existing roof.
Over vs under-deck24Over-Deck vs Under-Deck Roof Insulation
Should roof insulation go above the slab (over-deck) or below it (under-deck)? A head-to-head across thermal performance, slab protection, waterproofing, ceiling height, retrofit ease, cost and condensation, with a clear choose-this-if verdict for Indian homes.
Cool roofs25The Cool Roof Guide
A cool roof reflects the sun instead of soaking it up, cutting roof-surface temperatures by 15 to 30 degrees and top-floor rooms by a few. What makes a roof cool, the options, the temperature drops, and the fast payback — India-grounded.
Green roofs26The Green Roof Guide
Turn a hot, dead rooftop into a cool living layer. What a green roof is, extensive vs intensive vs semi-intensive, the layered build-up, the critical structural load, plants and irrigation for Indian climates, real benefits and costs, and retrofit feasibility — India-grounded.
Solar27The Solar Roof Guide
Putting rooftop solar on an Indian home — the system types, how to judge if your roof is ready, mounting and waterproofing, electrical and fire safety, cost and payback, and the permissions, net-metering and subsidy path. India-grounded, and pointed at current MNRE and DISCOM sources.
Ventilation28Roof Ventilation & Condensation
Roof ventilation lets the space under the covering breathe — shedding trapped heat and stopping the hidden condensation that rots timber and rusts metal sheet from below. Ridge, soffit, turbine and powered vents; intake plus exhaust; and the vapour-barrier question. India-grounded.
Tools & calculators
Put the hub to work. The first of a growing set of India-grounded roofing calculators — start by measuring the roof you are pricing, tiling or harvesting rain from.
Roof Area Calculator
The true (sloped) roof area from plan size & pitch — for tiles, sheets, coating & cost.
Measure it CalculatorRoof Pitch Calculator
Convert pitch between degrees, x-in-12 ratio, percentage & the slope factor.
Convert it CalculatorRoof Tile Calculator
How many tiles you need — Mangalore, country or concrete — with breakage & ridge tiles.
Count them CalculatorRainwater Harvesting Calculator
How much rain your roof can harvest a year — litres, kL & a suggested tank.
Harvest it CalculatorRoof Heat Gain Calculator
How much heat your roof adds — and how much insulation cuts it, in AC tons.
Beat the heat More soonA full roofing toolset
Sheet counts, rainwater, waterproofing & cost calculators are on the way.
All toolsA complete roofing library, built out section by section
These pillars are the spine. Each area below expands into deep-dive guides on roof types and structures, materials, waterproofing and drainage, thermal performance, cool, green and solar roofs, rainwater harvesting, safety, cost, maintenance and compliance — plus interactive calculators — all India-grounded, all honest about what belongs to a qualified professional.
Roof Types & Structures
Flat, sloping & terrace; RCC, steel, timber & alternatives
Materials
Tiles, metal, sheet, membrane & traditional roofing
Waterproofing & Drainage
Keeping water out & moving it off — the monsoon essentials
Cool, Green & Solar Roofs
Beating the heat, harvesting rain & generating power
Cost, Buying & Comparisons
What it costs, how to choose & this-vs-that decisions
Maintenance & Repair
Inspection, leak diagnosis & repair-vs-replace
Regulations & Standards
NBC, BIS, by-laws, structural, fire & solar approvals
Calculators & AI Tools
Area, slope, material quantity, rainwater, cost & more