Lesson 1Compatibility and galvanic corrosion: avoiding dissimilar metals and recommended separation methodsThis lesson explains how metals work together or not in roofs and what galvanic corrosion means. It teaches how to avoid bad metal combinations, pick safe fasteners, and use separation layers, good drainage, and proper detailing to keep zinc and zinc-coated steel safe.
Galvanic series and risk rankingProblematic metal combinationsNonmetallic separation layersFastener and accessory selectionDetailing to keep joints well drainedLesson 2Fasteners and clip systems: concealed clips, exposed screws, recommended materials and corrosion considerationsThis lesson talks about fasteners and clips for metal roofing. It covers hidden clips, exposed screws, choosing materials, strength against pulling out, and corrosion dangers, plus advice on spacing, tightening, and sealing washers for zinc roofs.
Concealed clip types and layoutExposed screw selection and sizingStainless vs coated carbon steelFastener spacing and edge distancesAvoiding overdriving and oil canningLesson 3Roof deck and substrate requirements: steel purlins, timber battens, sheathing compatibilityThis lesson shows how roof decks and bases must hold up metal roofing well. It discusses steel purlins, wooden battens, and sheathing, with focus on spacing, strength, fixings, and matching with zinc and zinc-coated steel panels.
Minimum deck slopes for metal roofingSteel purlin sizing and spacing rulesTimber batten dimensions and fixingSheathing types and fastener pull-outSubstrate flatness and tolerance checksLesson 4Standing seam vs corrugated vs ribbed profiles: water tightness and thermal movementThis lesson compares standing seam, wavy corrugated, and ribbed profiles. It looks at keeping water out, resisting wind, and handling heat expansion, to help you pick profiles, seam heights, and fixings for the slope, weather exposure, and zinc materials.
Profile selection by roof slopeStanding seam height and lock typesCorrugated and ribbed span limitsWater channeling and side lap designThermal movement in long panelsLesson 5Accessory materials: flashings, ridge caps, eaves trims, sealants compatible with zinc/zinc-coated steelThis lesson details extra materials to finish metal roofs properly. It covers flashings, ridge caps, eaves trims, and sealants, stressing leak-proof design, heat movement, and safe chemical matching with zinc and zinc-coated steel.
Types of flashings for zinc roofsDesigning ridge and hip capsEaves trims and drip edge detailingSealant types safe for zinc surfacesThermal movement joints in accessoriesLesson 6Comparison of zinc vs zinc-coated steel: corrosion resistance, patina formation, lifespanThis lesson compares pure zinc and zinc-coated steel for roofing. It checks rust resistance, patina build-up, strength, cost, and how long they last, to help choose the best metal for the weather, details, and upkeep plans.
Base metal composition differencesPatina formation stages on zincCorrosion behavior in marine zonesCost, weight, and stiffness trade-offsTypical lifespan and warrantiesLesson 7Material properties: thickness (mm/gauge), coating weights, and expected durabilityThis lesson goes over main properties of roofing metals. It includes thickness in mm or gauge, coating thickness, hardness, and expected lifespan, connecting these to span ability, dent resistance, and total service life.
Common zinc and steel thicknessesGauge systems and metric conversionCoating weight classes and labelsMechanical strength and span limitsService life expectations by climateLesson 8Insulation and ventilation strategy: types of insulation (rigid, mineral wool), ventilation gaps and placementThis lesson explains insulation and air flow plans under metal roofs. It covers hard boards, mineral wool, air gaps, and vent positions to stop condensation, make it comfortable inside, and protect zinc and zinc-coated steel setups.
Choosing rigid vs mineral woolWarm roof vs cold roof build-upsVentilation gap sizing and layoutEave and ridge vent positioningCondensation risk assessment basicsLesson 9Typical panel widths, lengths, and recommended overlaps for zinc and galvanized steelThis lesson sets out usual panel widths, lengths, and overlaps for zinc and galvanized steel. It handles coil widths, expansion limits, side and end overlaps, and handling tips for leak-proof, cost-effective, stable fitting.
Standard coil and panel widthsMaximum practical panel lengthsSide lap geometry and sealant useEnd lap lengths and staggeringTransport and site handling limitsLesson 10Underlayment options: breathable membranes, vapor barriers, and synthetic underlays for temperate climatesThis lesson shows underlay choices for metal roofs in moderate climates. It compares breathable sheets, vapour barriers, and man-made underlays, explaining placing, overlapping, and fitting with flashings to handle moisture well.
Breathable membrane functionsVapor barrier placement rulesSynthetic underlay performanceUnderlay laps, tapes, and sealingIntegrating underlay with flashings