BC Chapter 7 Flashcards
Solid wood has a useful tensile strength comparable to some types of steel based on strength to unit weight.
Defects in wood can greatly reduce this comparison, so the standard tenslie strength for wood is considered to be:
p. 183
700 psi
Most structural lumber has a moisture content of _______% or less.
p. 183
19%
__________ beams are frequently used in heavy timber where greater lengths are required.
p. 184
Glulam or Glue Laminated Beams
________ joints cannot be used where tensile stresses will be transmitted; butt Scarf and Finger Joints can.
p. 184
Butt Joints
____________ Composite Lumber is a wood-like product made from wood fiber and PVC.
p. 187
Thermoplastic Composite Lumber
What is the flame spread rating of Thermoplastic Composite Lumber?
p. 187
80
Nonveneered Panels are made of engineered wood formed into sheets using resin, heat and pressure.
Name 3 kinds:
Which is strongest?
p. 188
- OSB
- Particle Board
- Waferboard
A composite panel used in structural applications; made of plastic foam between two outer wood panels.
p. 189
Structural Insulated Panel (SIP)
___________ are used to increase the insulative properties of a building. Because foam insulation is combustible and because flame spreads rapidly over its surface, building codes impose stringent regulations on its use.
p. 191
Exterior Insulation and Finish Systems (EIFS)
Insulation material can also take the form of loose-fill materitals such as:
(4)
p. 191
- Granulated rock wool
- Mineral wool
- Glass wool
- Cellulose fiber and shredded wood, treated with water soluble salts to reduce combustiblity (fire in this material will slowly smolder).
A brick or stone veneer does not significatly affect fire behavior in a wood frame building but it does add to the thermal insulating value of the wall.
Veneer add litle structural support.
p. 193
True
During overhaul, firefighters can easily breah gypsum board.
Opening walls aid firefighters in locating fire travel in light wood-frame buildings.
p. 194
True
Maufacturered Components are prefabricated and shipped to the site for placement.
This permits greater quality control and more efficient use of materials.
Manufactured Components include:
(4)
p. 195
- Adhesives
- Dimensional Lumber
- Metal fasteners
- Panels
Pyrolysis of wood begins somewhere below ______degrees.
p. 197
392 degrees
The ____________ of a fuel is the total amount of thermal energy, in BTu, that can be released if the fuel is completely burned.
p. 197
Heat of Combustion
Platform framing is more prone to shrinkage than balloon framing because platform framing uses more horizontal members.
The shrinkage can produce greater vertical movement. This vertical movement can cause undesireable effects such as cracking of plaster and misaligned door and window openings.
p. 204
True
In heavy timber Type IV construction internal columns are not less than __ x __ inches.
And beams (except roof beams) are not less than ___ x ___ inches.
p. 206
8x8
6x10
