Cladding And Lagging TQ Prep Flashcards
What is the discharge angle of a gooseneck ventilator?
135°
What is the minimum height of the bottom straight section of a gooseneck ventilator above the base of a roof in heavy snowfall areas?
18”
What provides the main protection against rain, snow, and ice accumulation on the roof?
Roof curbs placed around the opening of the roof.
How often is the Alberta Building Code (ABC) republished?
Every 4 years.
What guidelines does the Alberta Building Code refer to?
SMACNA guidelines.
What are louvres designed to do?
Provide airflow into a building while keeping out moisture, birds, and insects.
What type of louvre blades are better at removing excess moisture?
Blades designed with a profile shape that has extra bends or folds.
How is the gooseneck ventilator hood attached?
It includes a straight section of duct that is fastened mechanically to the curb and sits 12” above the curb flashing.
What finishes can rolls of stainless steel cladding be ordered with?
Stucco embossed, smooth, 3/16” corrugated, or corrolon.
What are Pressed Elbows sized to cover?
Insulated 90° and 45° elbows.
What is the minimum lap for covering pipe insulation with aluminum?
50mm (2”) minimum.
Where should the lap for cladding on a horizontal pipe be placed?
Away from prevailing winds at 2 O’ clock.
What is the purpose of moisture barriers applied to aluminum?
To provide protection against corrosion.
Why can stainless steel cladding be used instead of aluminum?
For chemical and fire resistance.
How should aluminum be fastened on insulated tanks with excessive expansion and contraction?
With steel bands and expansion springs.
What should be used to prevent corrugated sheets from sliding down on a vertical tower?
S Clips.
What measurements are required for the layout of a bevel?
OD of pipe, OD of insulation, Crimp.
Which dimensions are placed into the square to lay out aluminum bevels?
One half of the outside diameter of pipe, one half of the OD of the pipe insulation, and the amount of crimp.
Which layout method is used to layout a gore pattern?
Parallel line development.
What is the primary use for caulking in cladding?
To prevent water from getting into the insulation.
What are the types of cladding end caps?
Crimp type/two piece, Crimper type end cap, Lock form end cap.
At what angle are bevels cut where the insulation ends?
45°.
What dimension do most pipe sizes refer to?
The inside diameter of the pipe, also known as the callout size.
What are end caps used for?
To cover insulation where the insulation ends.
What should be allowed for if the end cap is going over the metal?
Watershed.
What is the minimum overlap for all overlapping vertical sheeting?
75mm (2”).
What should be used to suspend one vertical pipe on another?
S clips.
What is the minimum lap required on all materials?
50mm (2”).
What are pop rivets?
Permanent mechanical fasteners that don’t vibrate or loosen over time like screws.
What are tear drops used for?
To support the banding between sheets.
What must be used when cutting back insulation at a 45° angle?
Metal bevels to cover the ends.
What are muffle jackets?
An inside rubber liner added to lower sound levels.
What types of protection are there in cladding or lagging?
Weatherproofing, fireproofing, chemical resistant, soundproofing.
What is the most common cladding material?
Aluminum.
What do moisture barriers prevent?
Chemical attack at the metal insulation interface.
What are gore elbows mainly used on?
Large mitres elbows, sweeps, or where it is difficult or impractical to use pressed elbows.
Where should bevels be installed in relation to removable objects?
At bolt length, plus 25mm (1”) away from all removable objects.
