Lesson 1Compatibility and galvanic corrosion: avoiding dissimilar metals and recommended separation methodsThis part explains how metals work together and galvanic corrosion in metal roofs. It shows how to avoid bad metal mixes, choose safe fasteners, and use separation layers, good drainage, and details to protect zinc and zinc-coated steel parts.
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 part talks about fasteners and clip systems for metal roofing. It explains hidden clips, exposed screws, picking materials, pull-out strength, and corrosion dangers, with tips on spacing, torque, 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 part explains how roof decks and bases must hold up metal roofing. It covers steel purlins, timber battens, and sheathing, looking at spacing, strength, fixings, and how they match 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 part compares standing seam, corrugated, and ribbed profiles. It looks at water tightness, wind strength, and heat movement, helping you pick profiles, seam heights, and fixings for the slope, weather, 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 part details extra materials to finish metal roofs. It covers flashings, ridge caps, eaves trims, and sealants, stressing watertight design, heat movement, and chemical match 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 part compares zinc and zinc-coated steel for roofing. It looks at rust resistance, patina build-up, stiffness, cost, and how long they last, helping you choose the right metal for the weather, details, and upkeep.
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 part reviews main material properties for metal roofing. It covers thickness in mm and gauge, coating weights, hardness, and expected life, linking them to span ability, dent resistance, and service time.
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 part explains insulation and air flow plans under metal roofs. It covers rigid boards, mineral wool, air gaps, and vent spots to control damp, make it comfy, and protect zinc and zinc-coated steel systems.
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 part sets out usual panel widths, lengths, and overlaps for zinc and galvanized steel. It covers coil widths, expansion limits, side and end laps, and handling to make sure watertight, cheap, and steady 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 part shows underlay choices for metal roofs in mild wet areas. It compares breathable membranes, vapor barriers, and man-made underlays, explaining placing, lapping, and fitting with flashings to handle moisture safe.
Breathable membrane functionsVapor barrier placement rulesSynthetic underlay performanceUnderlay laps, tapes, and sealingIntegrating underlay with flashings
