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ARCH TECH
LECTURE 5 INFO
| Question | Answer |
|---|---|
| What acoustic issue exists with thermal steel studs? | Sound transmission |
| How is thermal issue addressed? | Continuous insulation and thermal breaks |
| What is the main thermal issue with steel studs? | Thermal bridging |
| How is fire resistance achieved? | Through assemblies for ex. gypsum |
| Does steel burn? | No but it loses strength in heat |
| What is the real structure? | Concrete or structural steel frame |
| Are steel studs usually load bearing? | No |
| How does water vapor move? | From warm to cold, wet to dry, and diffusion through materials. |
| What drives vapor movement? | Vapor pressure |
| What are main phase changes of water relevant to buildings? | Evaporation, condensation, freezing, melting, sublimation, and deposition |
| What is the difference between vapor diffusion and air transport? | Vapor diffusion = slow movement through materials Air transport = fast movement through gaps or cracks |
| Which moves more moisture between air leakage and vapor diffusion? | Air leakage (30 quarts) |
| When does condensation occur? | When warm moist air meets a cold surface |
| In cold climates which direction does vapor move in winter? | From inside to outside |
| In summer months which direction does vapor move in water? | From outside to inside |
| Why is there no universal vapor barrier location? | Because vapor direction changes seasonally |
| What is the key idea about all walls? | All walls get wet the difference is whether they can dry. |
| What do permeable assemblies allow? | Vapor to pass through |
| How do permeable assemblies handle moisture? | They can dry to the inside or outside |
| Why are permeable assemblies more forgiving? | They tolerate small leaks |
| Examples of permeable materials? | Wood fibreboard, gypsum, and mineral wool. |
| What doe impermeable assemblies do? | Block vapor movement |
| What is the risk of impermeable walls? | They trap moisture if leaks occur. |
| Examples of impermeable materials. | Polyethylene, foil faced insulation, metal panels, and glass |
| What is the key design design implication? | Permeable walls manage risk and impermeable walls require perfection |
| What is light wood frame construction? | A building system using small dimension lumber with closely spaced members and nailed connections. |
| Where is light wood frame commonly used? | Houses, townhouses, low rise apartments, and small commercial buildings. |
| How does light framing differ from mass timber? | Light frame is many small members and mass timber is large beams and columns with bolted joints. |
| What does light refer to? | Many small members instead of few large ones |
| Typical stud spacing? | 16" or 24" on center |
| Why is light wood structure considered redundant? | Loads are shared across many members |
| What is platform framing? | Each floor is built as a platform |
| Why is platform framing used? | Simpler construction and fire stopping |
| What defines balloon framing? | Continuous studs from foundation to roof. |
| What is the key issue of balloon framing? | Continuous vertical cavities (fire risk). |
| What are SIPs made of? | Insulation core and structural skins as OSB or plywood |
| What roles do SIPs perform? | Structure, insulation, and air barrier. |
| How do SIPs carry loads? | Through panel skins acting like beams |
| How do vertical loads travel? | Roof to walls to foundation |
| What do studs act like? | Small columns |
| What resists wind and earthquake forces? | Shear walls |
| What materials form shear walls? | OSB and plywood sheathing |
| Why is stud spacing usually 16 inches or 24 inches? | To match material sizes like plywood, drywall and insulation. |
| What are floors made of? | Joists or subfloor |
| What do joists span between | Foundation walls, beams, or load bearing walls |
| What are the two main roof framing systems? | Rafters and trusses |
| What is the advantages of rafters? | Flexible design and allow attics or vaulted ceilings |
| What is the advantages of trusses? | Long spans and efficient and low cost. |
| Limitation of trusses? | Cannot be cit or modified. |
| What is advanced framing? | A method that uses less lumber and more insulation. |
| Key benefits of advanced framing? | Reduced thermal bridging, lower cost, lower embodied carbon |
| Key techniques of advanced framing? | 24 inch spacing, two stud corners, and insulated headers. |
| What is light steel framing? | Thin gauge cold formed steel studs |
| How is light steel framing assembled? | With screws |
| Are steel studs usually load bearing? | No |
| What is the real structure? | Concrete or structural steel frame |
| Does steel burn? | No but it loses strength in heat |
| How is fire resistance achieved? | Through assemblies for ex. gypsum |
| What is the main thermal issue with steel studs? | Thermal bridging |
| How is thermal issue addressed? | Continuous insulation and thermal breaks |
| What acoustic issue exists with thermal steel studs? | Sound transmission |
Created by:
averylumgair