Podcast
Questions and Answers
Flat timber trusses are constructed with 2x8s or ___ bolted together as top and bottom chords, as well as 2x4s or ___ web members
Flat timber trusses are constructed with 2x8s or ___ bolted together as top and bottom chords, as well as 2x4s or ___ web members
2x10 2x6
Bowstring and flat timber trusses are spaced ____ ft apart
Bowstring and flat timber trusses are spaced ____ ft apart
20
Flat timber trusses should never be worked on or under if there is ____ fire inside
Flat timber trusses should never be worked on or under if there is ____ fire inside
Heavy
The most common type of lightweight truss has short scraps of 2x4s joined together by means of stamped sheet metal fasteners called a ___ nail or _____ plate
The most common type of lightweight truss has short scraps of 2x4s joined together by means of stamped sheet metal fasteners called a ___ nail or _____ plate
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A second style of light weight truss consist of 2x4s or ___ top and bottom chords connected by _____ steel webs
A second style of light weight truss consist of 2x4s or ___ top and bottom chords connected by _____ steel webs
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These light steel elements act as heat ____. Lightweight trusses biggest drawback is their lack of ____
These light steel elements act as heat ____. Lightweight trusses biggest drawback is their lack of ____
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Gusset plates penetrate the wood only about ____in
Gusset plates penetrate the wood only about ____in
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Drilling a hole (up to __ in. In diameter) weakens the 2x4. Second the hole and steel pin allow fire to attack from the inside and outside the wood of the chord
Drilling a hole (up to __ in. In diameter) weakens the 2x4. Second the hole and steel pin allow fire to attack from the inside and outside the wood of the chord
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A risk to all _____ chord 2x4 trusses is the risk of penetrating the top chord with a power saw blade
A risk to all _____ chord 2x4 trusses is the risk of penetrating the top chord with a power saw blade
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Parallel chord trusses are often only covered with an ____ of roofing and plywood
Parallel chord trusses are often only covered with an ____ of roofing and plywood
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Frank brannigan coined the term ____ loft
Frank brannigan coined the term ____ loft
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No longer do FFs have __-20 minutes in which to search, rescue and attack before they notice the floor or roof sagging.
No longer do FFs have __-20 minutes in which to search, rescue and attack before they notice the floor or roof sagging.
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Many of the new systems fail in less than __ minutes often without any noticeable sag
Many of the new systems fail in less than __ minutes often without any noticeable sag
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The parallel chord beam that consist of a top and bottom chord of 1 1/2x__ in plywood with a web of __ in plywood
The parallel chord beam that consist of a top and bottom chord of 1 1/2x__ in plywood with a web of __ in plywood
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One common type of lightweight roof, especially on _____ buildings consist of open web steel bar joist supporting corrugated steel deck. The problem with these roof rest with the steel itself and it’s ____ when heated
One common type of lightweight roof, especially on _____ buildings consist of open web steel bar joist supporting corrugated steel deck. The problem with these roof rest with the steel itself and it’s ____ when heated
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Steel bar joist are formed by bending a steel bar in a repeating __ pattern
Steel bar joist are formed by bending a steel bar in a repeating __ pattern
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Steel bar joist can be up to ___ ft long and may be spaced up to __ft apart
Steel bar joist can be up to ___ ft long and may be spaced up to __ft apart
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Ch 17 pg 435 says steel bar joist are spaced 2 to __ ft apart
Ch 17 pg 435 says steel bar joist are spaced 2 to __ ft apart
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The roof decking steel sheets averaging __ in thick, __ ft wide and __ ft long are sometimes tack welded in place
The roof decking steel sheets averaging __ in thick, __ ft wide and __ ft long are sometimes tack welded in place
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The insulating material on top of the metal sheets can be either _____ or rubber sheeting up to __ in thick
The insulating material on top of the metal sheets can be either _____ or rubber sheeting up to __ in thick
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The primary hazard to roof FFs from metal deck roofs is ___ into the vent hole while cutting it
The primary hazard to roof FFs from metal deck roofs is ___ into the vent hole while cutting it
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Sudden catastrophic collapse isn’t as common in ___ joist supported roofs
Sudden catastrophic collapse isn’t as common in ___ joist supported roofs
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Past experience has shown while these roofs fail in less than __ minutes of exposure to heavy fire, they don’t fail suddenly
Past experience has shown while these roofs fail in less than __ minutes of exposure to heavy fire, they don’t fail suddenly
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FFs should us a ____ or solid stream to cool the underside of a metal deck and roof joist well ahead of their location
FFs should us a ____ or solid stream to cool the underside of a metal deck and roof joist well ahead of their location
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