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Questions and Answers
Which material is known to create combustible void spaces, increasing fire risks in wood-frame construction?
Which material is known to create combustible void spaces, increasing fire risks in wood-frame construction?
- Glass
- Concrete
- Wood (correct)
- Steel
What does the term 'framed building' refer to in wood construction?
What does the term 'framed building' refer to in wood construction?
- A building with non-combustible materials
- A building with a skeleton of beams and columns (correct)
- A building with no interior walls
- A structure with load-bearing walls
What is a 'wall-bearing building'?
What is a 'wall-bearing building'?
- A building where the walls carry the structural load (correct)
- A building where the beams carry the structural load
- A building with curtain walls
- A building with metal siding
What is the purpose of chamfering the corners of timber?
What is the purpose of chamfering the corners of timber?
What is 'engineered wood'?
What is 'engineered wood'?
Which of the following best describes 'glued laminated timber (glulam)'?
Which of the following best describes 'glued laminated timber (glulam)'?
What is a 'heavy timber' classified as in construction?
What is a 'heavy timber' classified as in construction?
What is the main characteristic of 'legacy construction'?
What is the main characteristic of 'legacy construction'?
What is the primary concern with wood shingle roofs in terms of fire safety?
What is the primary concern with wood shingle roofs in terms of fire safety?
Which classification is given to roofing materials that are the least fire-resistant?
Which classification is given to roofing materials that are the least fire-resistant?
What is a key firefighter safety concern with tile roofs?
What is a key firefighter safety concern with tile roofs?
What is imitation timber primarily used for in construction?
What is imitation timber primarily used for in construction?
What is a significant fire hazard of imitation timber?
What is a significant fire hazard of imitation timber?
What is a flitch plate girder composed of?
What is a flitch plate girder composed of?
What is a ridge board used for in roofing?
What is a ridge board used for in roofing?
What is the purpose of a top plate in wood-frame construction?
What is the purpose of a top plate in wood-frame construction?
What is a key characteristic of engineered wood products?
What is a key characteristic of engineered wood products?
Which framing method poses a risk of fire traveling from the cellar to the attic?
Which framing method poses a risk of fire traveling from the cellar to the attic?
What does the term 'matched lumber' refer to?
What does the term 'matched lumber' refer to?
What is the primary fire hazard of lightweight wood trusses?
What is the primary fire hazard of lightweight wood trusses?
Which characteristic is associated with truss frame construction?
Which characteristic is associated with truss frame construction?
What significant risk do wooden I-beams present in fire scenarios?
What significant risk do wooden I-beams present in fire scenarios?
What hazard is commonly associated with low-density fiberboard sheathing?
What hazard is commonly associated with low-density fiberboard sheathing?
What is the fire-related concern of asphalt felt siding?
What is the fire-related concern of asphalt felt siding?
What is the role of firestopping in building construction?
What is the role of firestopping in building construction?
In the context of fire safety, what does 'draftstopping' aim to restrict?
In the context of fire safety, what does 'draftstopping' aim to restrict?
What is the primary method of fire protection involved with pressure treated wood?
What is the primary method of fire protection involved with pressure treated wood?
Which siding material is considered combustible and is laid horizontally over sheathing?
Which siding material is considered combustible and is laid horizontally over sheathing?
What problem arises from delamination in plywood during a fire?
What problem arises from delamination in plywood during a fire?
Which of the following materials is typically used for sheathing in wood-frame construction?
Which of the following materials is typically used for sheathing in wood-frame construction?
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Study Notes
Wood-Frame Construction and Fire Risks
- Combustible void spaces created by wood increase fire hazards in wood-frame structures.
- Framed buildings utilize a skeleton of beams and columns rather than load-bearing walls.
- Wall-bearing buildings rely on their walls to support the structural load.
Timber Characteristics and Treatment
- Chamfering corners of timber reduces ignition risk by creating safer edge profiles.
- Engineered wood consists of laminated timbers or wood modified for enhanced structural performance.
- Glued laminated timber (glulam) is formed by gluing layers of planks together, providing strength and flexibility.
Construction Techniques
- Heavy timber is classified as lumber with dimensions of 8 inches or more, offering substantial support.
- Legacy construction involves the use of solid wood members, distinguishing it from modern lightweight alternatives.
- Oriented strand board (OSB) is made from layered wood strands glued under pressure, providing a versatile sheathing option.
Fire Hazards in Wood Construction
- Balloon frame construction lacks firestopping, enabling flames to spread swiftly from cellar to attic.
- Platform framing builds each floor as a platform for the next, providing stability.
- Lightweight wood trusses are prone to early collapse in fires due to their small cross-sections.
Fire Safety Measures
- Firestopping limits vertical movement of fire through concealed spaces, crucial for safety.
- Draftstopping restricts horizontal fire spread in larger concealed areas to prevent widespread flames.
- Pressure-treated wood reduces flame spread but can still ignite under prolonged exposure to fire.
Material Properties and Risks
- Wooden I-beams can fail quickly in a fire due to the burning of their OSB webs.
- Delamination in plywood increases its exposed surface area, accelerating burning in fire conditions.
- Low-density fiberboard sheathing can easily smolder or burn if ignited, presenting significant risks.
Cladding and Roofing Concerns
- Novelty siding is a combustible material laid horizontally, posing increase fire risks.
- Asphalt felt siding is highly combustible and produces dense smoke when involved in fires.
- Vinyl siding, made from thermoplastic material, can deform and drip when exposed to extreme heat.
Fire Resistance Classifications
- Class C roofing materials have the lowest fire resistance, raising hazards in high-risk situations.
- Tile roofs may collapse without visible signs of weakness, endangering firefighter safety.
Structural Elements in Wood Construction
- Flitch plate girder consists of a steel plate sandwiched between two wood beams, enhancing load-bearing capacity.
- Ridge boards connect the upper ends of rafters, playing a critical role in roof stability.
- Studs are vertical columns in wood-frame buildings that provide essential structural support.
These notes encompass key facts about wood-frame construction, focusing on fire hazards, benefits of materials, and structural characteristics.
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