Wood Flashcards
Most of the lumber used today for the building structural frame comes from what type of wood?
Softwoods; plentiful and inexpensive
Most of the lumber used today for furniture, cabinetry, interior paneling, flooring, and other fine woodwork used what type of wood?
Hardwoods, and some denser softwoods; better stability, attractiveness, finish ability, and resistance to wear
Wood buildings are typically judged to have lower what compared to steel or concrete buildings of comparable size?
Embodied energy and global warming impacts
Quartersawn wood
Produces smaller pieces, generates greater waste
More dimensionally stable and have a more visually pleasing grain figure
Used for flooring, trim, siding, and other types of finish woodwork
Can hold paint better
The averages of the equilibrium moisture content for exterior and interior woods
Exterior: 12%
Interior: 8%
Standard framing lumber is seasoned to a moisture content level of
19%
Boards and Dimension Lumber
Boards and Dimension Lumber
Timbers
Type IV heavy timber walls
Must be constructed of at least 2 layers of boards, each not less than 1” thick, laminated crosswise, cross-laminated or nail-laminated timber panels at least 4” thick, or other 1 hours fire resistant rated construction
Finish layer of nominal 1” tongue-and-groove boards is used how and where
In type IV heavy timber construction over solid wood, glutamate, and NLT decking between floors to resist the passage of hot gasses and smoke
Laid diagonally or at right angles to the decking
In heavy timber construction, a common design problem is
There are no places to hide building services
Roof insulation in heavy timber is
on top of the roof deck
Electrical wiring in heavy timber construction is
Either run through exposed conduit, or be channeled within the deck
Mass timber construction
Wood structural systems incorporating cross-laminated timber or other large format, load bearing wood panels, and is often associated with structures exceeding the building code height limits of conventional timber frame construction
Fire resistance rated connections
Embedded in the wood member, or covered with gyp or other fire-protective material
Foam plastic on the outside of the foundation wall can align with cont. insulation on the wall above
When insulation is applied to the inside of the basement wall, air-impermeable rigid foam boards may be used to prevent warm interior air from reaching the cool concrete wall surfaces and causing condensation. When facing the building interior, plastic foam insulation must also be covered with a layer of gyp or other fire-resistant material to delay the release of toxic gasses in the event of building fire
When crawlspaces are insulated, the strategies are similar to basements. Insulation under the perimeter areas of the slab may also be required. Must be covered with an inhibition barrier facing or finish material that reduces the risk of fire
When a crawl pace is ventilated to the exterior, the floor above must be insulated. Reduces thermal bridging and protects the joints and insulation above from high humidity
When a slab on grade is connected to the foundation wall, insulation is applied to the exterior. Energy code requires a minimum depth
When the slab on grade and foundation wall are not connected, insulation may be applied under and around the edges of the slab
Foundation sill plate
Sometimes called mudsill
Is attached to the top of the ounation to serve as a base for the wood framing to follow
Preservative-treated for resistance to insects and moisture
Blocking/bridging
Where floor joists exceed 12” in depth, bridging id inserted at intervals not exceeding 8’
Is wood a good insulator
No
