Wall, roof, and floor assemblies. Fire resistance, acoustics, moisture, thermal performance, and the transition details that make or break them.
Every Assemblies and Detailing practice question links back to the reference you'd use in the real exam.
Canadian Handbook of Practice
Building Construction Illustrated
Fire resistance reference
Acoustic reference
Acoustic reference
Envelope reference
Rainscreen reference
Examitect drills each of these areas. The list below maps to the question categories you'll see inside.
Why this topic matters. Assembly questions test whether you can read or specify a wall section. Examiners reward candidates who can trace each control layer through an assembly and know what changes at every transition.
An assembly is a stack of materials that together provide a specific performance: fire resistance, acoustic separation, weather resistance, thermal performance. Detailing is how you join one assembly to another. Most envelope failures happen at the details, not in the field of the wall.
Six performance domains: fire resistance (rated assemblies, tested or generic), acoustic separation (STC, IIC, NRC), moisture management (rainscreen, drained cavity, vapour control), thermal performance (continuous insulation, thermal bridging), durability (corrosion, decay, UV), and constructability (sequencing, tolerances).
Common STC ratings: 50 for typical demising walls (residential between dwellings), 55 to 60 for high-performance separations. IIC for footfall noise: 50 minimum. Common 1-hour fire ratings via gypsum: single layer 5/8 inch Type X each side. 2-hour assemblies use double-layer construction. Rainscreen cavities: typically 10 to 25 mm drained and ventilated.
Watch for distractors that solve an acoustic problem with insulation alone. Mass, decoupling, and absorption are all required. Tested assemblies are required where listed; generic alternates require documentation. Continuous insulation outside the framing reduces thermal bridging dramatically, but pay attention to fastener attachment.
Placeholder notes. Full Assemblies and Detailing notes (with diagrams, worked examples, and references) ship with paid access.
Estimated study time. Most candidates spend 12 to 18 hours on Assemblies and Detailing. Adjust up if you don't see this work in your day job, down if you do.
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See how Examitect explains every answer with real book references.
Sound Transmission Class, a single-number rating of how much airborne sound an assembly blocks. Higher is better. Typical residential demising wall: STC 50.
Multiple options. A common one: 2x4 wood studs at 16 inches o.c. with single-layer 5/8 inch Type X gypsum each side. Tested assemblies in the gypsum reference document show many alternatives.
An exterior cladding system that allows drainage and ventilation behind the cladding. The cavity is typically 10 to 25 mm. The drainage plane (sheathing membrane) is the real water control layer.
12 to 18 hours. Pair this with materials and with building science. They overlap significantly.
Topics that pair well with Assemblies and Detailing prep.