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ARCH TECH
LECTURE 7 INFO
| Question | Answer |
|---|---|
| What are key considerations when designing wall assemblies? | Constructability, material specificity, rainscreen design, and cladding support |
| What is constructability thinking? | Designing assemblies so they can actually be built efficiently and correctly |
| Why is constructability important? | It ensures realistic construction, reduces errors, and improves performance. |
| What does material specificity? | Clearly defining each material and its role in an assembly |
| Why is material specificity important? | It ensures clarity in construction and proper performance of each layer. |
| Name typical wall assembly components. | Structural framing (2x6 studs), sheathing (OSB), insulation (cellulose), air barrier, weather barrier, and strapping. |
| What is the purpose of a rainscreen? | To manage moisture by allowing drainage and ventilation behind cladding |
| What key feature enables a rainscreen to work? | A ventilated cavity |
| What is masonry cladding? | A non structural exterior layer (Brick) |
| What is a key feature of brick veneer walls? | A cavity between brick and backup wall |
| What is the purpose of the cavity? | Drainage, ventilation, and moisture control. |
| How is brick veneer supported laterally? | With masonry ties connected to the backup wall. |
| Why are movement joints needed? | To accommodate thermal expansion and prevent cracking. |
| What are the main elements of roof assemblies? | Structural support, control layers, and roof form. |
| What provides structural support in roofs? | Rafters, trusses, and joists |
| What are key control layers in sloped roofs? | Roofing material, water control layer, air/vapor control layer, insulation. |
| Where does condensation often occur in sloped roofs? | On cold roof sheathing |
| Why is ventilation important in sloped roofs? | To remove moisture and prevent condensation buildup. |
| What is required for flat roofs? | A continuous waterproof membrane. |
| What is the typical slope of a flat roof? | Min. approx. 1:40 |
| How is drainage handled in flat roofs? | Internal frains, scuppers, and slight slope built into structure or insulation. |
| What structural systems can support flat roofs? | Concrete slabs, steel beams, and wood joists |
| What are control layers in assemblies? | Layers that control heat, air, vapor, and water |
| What layers control moisture in sloped roofs? | Roofing membrane, ventilation cavity, vapor retarder, insulation. |
| What are key control strategies for flat roofs? | Waterproof membrane on top, insulation placement, and vapor control layer. |
| Why is it important to coordinate all layers in an assembly? | Because structure, moisture, and thermal performance all interact. |
| What questions should you ask when reviewing an assebly? | What supports this element? How is it attached? Where is adjustment required? What could be misread on site? |
| What are the main causes of basement failures? | Water and soil interaction, frost action, swelling clays, and high water table |
| What is the most important strategy for basement water control? | Diverting ground water away from the building |
| Why is surface water control not enough? | Because it is often imperfect so walls must still resist water ingress |
| What are two lines of defense in basement wall systems? | 1. exterior insulation surface 2. Foundational wall |
| What does the first line of defense do? | Manages and directs water downward to drainage systems. |
| What does the second line of defense do? | Handles any water that bypasses the first layer. |
| How did insulation perform over time in the study? | All products maintained stable thermal performance over two heating seasons |
| Why does insulation perform consistently below grade? | Because temperatures are more stable underground |
| What happens when moisture moves through insulation? | Thermal performance decreases |
| Why didnt performance drop significantly in the study? | Moisture remained low due to equilibrium conditions. |
| What is EPS insulation? | Expanded polystyrene rigid board insulation |
| How did EPS perform? | Maintained thermal performance and prevented water reaching the wall |
| What is unique about SPF insulation? | Applied in place and forms a continuous sealed layer. |
| What advantage does spf provide? | It protects the footing and directs water away. |
| How does mineral fibre insulation manage water? | Through drainage within fibre voids. |
| Did water reach the wall behind it? | No |
| What is key property of glass fibre insulation? | It compresses but still maintains thermal performance. |
| Are drainage cavities required for basement insulation? | No water can be managed at the surface without cavities. |
| What are drainage grooves intended to do? | Relieve water pressure at the interface |
| What happens when insulation is connected to conductive materials? | Thermal bridging reduces performance |
| Why does houses need ventilation? | Supply oxygen, remove pollutants, and control humidity. |
| How were older houses ventilated? | Through air leakage |
| Why doesnt this work today? | Modern houses are more airtight |
| What happens if ventilation is insufficient? | Poor air quality, high humidity. mold, and condensation. |
| What is the recommended air change rate? | approx. 0.3 air changes per hour |
| Why is mechanical ventilation required? | To ensure consistent air exchange regardless of conditions. |
| When should a ventilation system operate? | Only when needed |
| Where should fresh air be delivered? | Living rooms, bedrooms, and kitchens |
| Why must ventilation system be quiet? | So occupants dont turn them off |
| What is demand controlled ventilation? | A system that adjusts airflow based on indoor conditions. |
| What sensors might be used? | Humidity, CO2, and pollutants. |
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averylumgair