Podcast
Questions and Answers
What is the purpose of the mud tube constructed by subterranean termites?
What is the purpose of the mud tube constructed by subterranean termites?
- To protect themselves from the sun
- To create a nesting site
- To store their food
- To provide a route to the wood (correct)
Where are non-subterranean termites typically found in the United States?
Where are non-subterranean termites typically found in the United States?
- The southern part of the country (correct)
- The eastern part of the country
- The northern part of the country
- The western part of the country
What is a sign that indicates the presence of non-subterranean termites inside wood structural members?
What is a sign that indicates the presence of non-subterranean termites inside wood structural members?
- The presence of mud tubes
- The presence of discarded wings
- The presence of sawdust-like pellets (correct)
- All of the above
When are discarded wings typically found in wood infested with non-subterranean termites?
When are discarded wings typically found in wood infested with non-subterranean termites?
What is the primary purpose of vegetable glues?
What is the primary purpose of vegetable glues?
Why should lumber be inspected for evidence of infestation before it is used in construction?
Why should lumber be inspected for evidence of infestation before it is used in construction?
What is the purpose of a physical barrier in termite prevention?
What is the purpose of a physical barrier in termite prevention?
What is the main difference between box nails, common nails, and spikes?
What is the main difference between box nails, common nails, and spikes?
What happens when unseasoned wood is nailed and then seasoned?
What happens when unseasoned wood is nailed and then seasoned?
What is the primary characteristic of animal glues?
What is the primary characteristic of animal glues?
What affects the resistance to withdrawal of a nail?
What affects the resistance to withdrawal of a nail?
Why are nails sometimes coated with cement or rosin?
Why are nails sometimes coated with cement or rosin?
What is the primary purpose of wax in wood finishing?
What is the primary purpose of wax in wood finishing?
What is the characteristic of a Semi-Transparent Stain?
What is the characteristic of a Semi-Transparent Stain?
What is the main advantage of Glue-Lam construction?
What is the main advantage of Glue-Lam construction?
What is the primary difference between Varnish and Sealer?
What is the primary difference between Varnish and Sealer?
What is the typical use of Creosote and creosote–coal tar mixtures?
What is the typical use of Creosote and creosote–coal tar mixtures?
What is a common characteristic of Glue-Lam Timbers?
What is a common characteristic of Glue-Lam Timbers?
What is the primary purpose of OSB APA-rated Sturd-I-Floor?
What is the primary purpose of OSB APA-rated Sturd-I-Floor?
What are the criteria for meeting the OSB panel performance standard?
What are the criteria for meeting the OSB panel performance standard?
What is a characteristic of Casein Glue?
What is a characteristic of Casein Glue?
What is the primary application of Casein Glue?
What is the primary application of Casein Glue?
Which type of glue is used when waterproof glues are needed?
Which type of glue is used when waterproof glues are needed?
What is a common characteristic of Melamine resin, phenol resin, resorcinol resin, and resorcinol resin–phenol resin combinations?
What is a common characteristic of Melamine resin, phenol resin, resorcinol resin, and resorcinol resin–phenol resin combinations?
What is the primary concern for shear wall systems in terms of connection to other structural elements?
What is the primary concern for shear wall systems in terms of connection to other structural elements?
What is a major advantage of using wood composites for outdoor deck and railing systems?
What is a major advantage of using wood composites for outdoor deck and railing systems?
What is a characteristic of wood composites that sets them apart from natural wood?
What is a characteristic of wood composites that sets them apart from natural wood?
What is not a typical application of wood composites?
What is not a typical application of wood composites?
What is an advantage of using wood composites in outdoor applications?
What is an advantage of using wood composites in outdoor applications?
Study Notes
OSB Panels and Performance Standards
- OSB panels adhere to Voluntary Product Standard PS-2 or APA PRP-108, emphasizing structural adequacy, dimensional stability, and bond durability.
- Performance criteria include tests for uniform/concentrated loading, impact loading, racking, and fastener strength.
Applications of OSB
- Commonly used for wall and roof sheathing, as well as subflooring.
- OSB APA-rated Sturd-I-Floor is designed for single-layer floor systems with tongue and groove edges.
Adhesives Used in Wood Construction
-
Casein Glue:
- Derived from milk, sets quickly, and is effective in damp conditions.
- Used in structural joining and glued-laminated timber.
-
Waterproof Resins:
- Includes melamine, phenol, and resorcinol resins, often requiring high curing temperatures.
- Show minimal staining, are strong, and tend to be expensive.
-
Wax Coatings:
- Made from beeswax or carnauba, offering a protective finish against scratches and moisture.
- Prone to cracking and chipping due to expansion and contraction.
-
Varnish and Sealers:
- Varnish applies a clear coat to showcase wood grain.
- Sealers are water-repellent, preventing moisture penetration while allowing grain visibility.
Glue-Laminated Wood (Glu-Lam)
- Limited by the size and characteristics of available trees; lumber over 24 ft (7.2 m) or greater than 12 in. x 12 in. is challenging to source.
- Glue-Lam members are essential for heavy timber construction, typically made from Douglas fir or southern pine.
Paint and Coating Classifications
- Paints categorized as exterior or interior, with solvent types classified as water-based or oil-based.
- Important for providing structural integrity under extreme loading conditions, ensuring system flexibility and shear wall effectiveness.
Wood Composites
- Wood fibers can blend with plastics for outdoor applications like decking and railing.
- Composites resist moisture and insects, require less maintenance, and are less prone to splintering compared to traditional wood.
Termite Identification and Control
-
Subterranean Termites:
- Construct mud tubes for moisture access, revealing their presence.
-
Non-Subterranean Termites:
- Can thrive in damp or dry wood without returning to the ground, detectable by tiny pellet droppings and shed wings.
- Infestation signs may be present in lumber delivered at construction sites.
Physical Barriers in Construction
- Comprise concrete or steel supports creating space between wood and ground, with optional metal shields for extra protection.
Fasteners and Nails
- Nails come in various types: box nails (thinnest), common nails, and spikes (thickest).
- Unseasoned wood can cause nails to loosen; best to use dry wood to avoid shrinkage issues.
Glue Types in Wood Manufacturing
- Animal Glue: Traditionally used for wood bonding, made from animal byproducts and utilized heated.
- Vegetable Glue: Made from starch, offers high strength and is used in plywood manufacturing.
Mechanical Fastener Considerations
- Withdrawal resistance of nails varies based on diameter, length, and wood specific gravity.
- Nails may be treated to improve withdrawal resistance.
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Description
Learn about the unique habits of termites, including how they build mud tubes to access wood and protect themselves from the sun. This quiz covers the behavior of non-subterranean termites found in the southern United States.
