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C-39 ROOFING TRADE TEST 1 AND TEST 2 | ALL QUESTIONS
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C-39 ROOFING TRADE TEST 1
A span rating of _______ means that a plywood panel may be used for roof decking over supports spaced 32 inches o.c. or for sub flooring over supports spaced 16 inches o.c. ---------CORRECT ANSWER----------------- 32/ On plywood decks not covered with insulation, a base ply should be _______ to serve as as the base ply of the roof membrane. --------- CORRECT ANSWER-----------------Attached with annular-threaded nails The choice of membrane type for a roof is frequently determined by: --------- CORRECT ANSWER-----------------Geographical location and Climate Technical information useful in the selection of roof membranes is provided by the: ---------CORRECT ANSWER-----------------National Bureau of Standards On low-sloped roofs, felt should be laid _______ the flow of water, beginning at _______ points in the deck. ---------CORRECT ANSWER------- ----------Perpendicular ... low
On slopes over 2 inches per foot, felt should be laid: ---------CORRECT ANSWER-----------------Parallel to the slopes For asphalt roofs, treated wood nailers should be installed perpendicular to the slope and on 20 - foot centers for slopes up to: ---------CORRECT ANSWER-----------------3 inches per foot A roofing contractor discovers damage done by other trades to a newly installed roof. What should the roofing contractor do? - --------CORRECT ANSWER-----------------Submit a written report to the general contractor and/or the owner for any visible damage When layers of felt are joined by hot-mopping, the process is most similar to: ---------CORRECT ANSWER-----------------Welding If final surfacing is not installed, roofing felts already installed should be: ---- -----CORRECT ANSWER-----------------"Glazed" and sealed at the end of each days work The bending radius of compositional roofing materials is generally limited to: ---------CORRECT ANSWER-----------------45 degrees To allow for the bending radius of compositional roofing materials, all vertical surfaces must have: ---------CORRECT ANSWER-----------------Can't strips between the roof and the vertical surface
Roofing insulation and membranes must be protected from latent moisture in concrete decks. In northern climates, this is usually accomplished with: -- -------CORRECT ANSWER-----------------A vapor retarder or A venting sheet Steel decks should be at least _______ or heavier. ---------CORRECT ANSWER-----------------22g Insulation applied to steel roof decks before the roof membrane is installed should be applied: ---------CORRECT ANSWER-----------------In two separate layers where insulation thickness permits The top flanges of a steel roof deck should be installed: ---------CORRECT ANSWER-----------------Perpendicular to the roof slope The maximum deflection allowed for a steel deck is: ---------CORRECT ANSWER-----------------1/4" per 100 feet If the steel decks must be spot-welded to structural steel, puddle welds _______ or larger in diameter are recommended. They should be made on washers and spaced at least _______ on center. ---------CORRECT ANSWER-----------------1/2 inches ... 12 inches If thermosetting insulation is used over structural decks, the density should be: ---------CORRECT ANSWER-----------------18 to 22 pounds per cubic foot
The correct density for thermosetting insulation is accomplished by: --------- CORRECT ANSWER-----------------Compacting Thermosetting insulation is compacted in two layers if the total thickness is greater than: ---------CORRECT ANSWER----------------- 6 inches Thermosetting insulative fills must be protected from latent moisture in roof decks. Which of the following procedures is recommended? --------- CORRECT ANSWER-----------------Install base-ply vapor barrier and Install wood nailers at all perimeters and Install wood nailers at all roof projections What type of roof is recommended over thermosetting insulative fills --------- CORRECT ANSWER-----------------Aggregate Your estimator has shorted you an area of 20' x 24'. If you are using a two- ply built-up system using rolls that cover 4 roofing squares per roll, how many additional rolls of felt do you need to order? ---------CORRECT ANSWER-----------------2. When installing sheet-laying adhesives, the overlap should be: --------- CORRECT ANSWER-----------------10" Which of the following are used to carry hot asphalt? ---------CORRECT ANSWER-----------------Pouring can or
The best roofing method for metal roofs that have only a slight slope is to use a: ---------CORRECT ANSWER-----------------Flat seam When installing a flat seam roof, the seams may be sealed with a sealant except where the slope is less than _______, in which case the seam must be soldered. ---------CORRECT ANSWER-----------------3: Flat seam roofs of slight pitch should be divided by expansion battens into sections not exceeding: ---------CORRECT ANSWER-----------------30 ft square Before installing a flat seam roof, a wood deck should be covered with: ----- ----CORRECT ANSWER-----------------30 lb felt In the flat seam roofing method, the roof is covered by plans made from: --- ------CORRECT ANSWER-----------------20" x 28" sheets What is the minimum gage copper recommended for flat seam roofs? ------- --CORRECT ANSWER-----------------16 oz Batten seam roof are not recommended for roofs having a slope less than: ---------CORRECT ANSWER-----------------3: Which of the following metals will expand the most? ---------CORRECT ANSWER-----------------Aluminum
Which of the following metals will expand the most? ---------CORRECT ANSWER-----------------Zinc 0.020" thick aluminum is approximately: ---------CORRECT ANSWER-------- ---------24 gage 0.020" thick copper approximately equals: ---------CORRECT ANSWER------ -----------24 gage, B&S Which is lowest on the galvanic scale? ---------CORRECT ANSWER---------- -------Steel Which has the least rigidity? ---------CORRECT ANSWER----------------- 16 oz soft copper When joining 22 oz copper sheets, which procedure would produce the strongest joint? ---------CORRECT ANSWER-----------------Sheets lapped, riveted, and soldered A 10' length of stainless steel will expand _______ with a temperature increase of 100*F ---------CORRECT ANSWER-----------------1/8" Sheet copper is over _______ wide. ---------CORRECT ANSWER------------- ----24"
When designing a rectangular gutter, the minimum ratio of depth to width should be: ---------CORRECT ANSWER-----------------3 to 4 To protect the edge of the building and metal roof from rain and wind, you should install a: ---------CORRECT ANSWER-----------------Perimeter flashing What should be the minimum gage of galvanized steel valley flashing? ------ ---CORRECT ANSWER-----------------24 gage How many fasteners per cleat are required when using expansion cleats for standing seam metal roofs with continuous pans over 30' in length? --------- CORRECT ANSWER----------------- 2 Rigid insulation is to be applied over a wood roof deck. A metal or wood grid system must be installed if the rigid insulation is: ---------CORRECT ANSWER-----------------1 1/2" thick or greater At what slope does a roof become a high-pitched roof? ---------CORRECT ANSWER-----------------Over 6: A roof is considered to be low-pitched when its slope is: ---------CORRECT ANSWER-----------------3:12 or less
A roof with a slope of 8:12 is considered what pitch? ---------CORRECT ANSWER-----------------1/3 pitch Your crew is on the roof welding with materials containing beryllium and there is a strong wind. According to Cal/OSHA, what must you do? --------- CORRECT ANSWER-----------------Require crew to wear supplied-air respirators What thickness of zinc coating is placed on steel sheets to create galvanized sheets? ---------CORRECT ANSWER-----------------1.25 oz/sq ft What type of flux is used to solder copper? ---------CORRECT ANSWER---- -------------Cut acid Which solder is best for copper? ---------CORRECT ANSWER----------------- 50/50 tin-lead Acid flux residue can be removed with what liquid? ---------CORRECT ANSWER----------------- 5 - 10% solution of washing soda When it is necessary to install dissimilar metals, you can place sheet lead or building paper between the metals or paint with: ---------CORRECT ANSWER-----------------Asphaltum paint What is the correct exposure for #235 asphalt shingles? ---------CORRECT ANSWER-----------------5"
Extension ladders must overlap _______ of their working length. --------- CORRECT ANSWER-----------------10% Landing platforms must be provided every _______ if a worker must climb to a height greater than 20 feet on a ladder. ---------CORRECT ANSWER--- --------------20 ft In an excavated area provide a ladder every: ---------CORRECT ANSWER-- ---------------50 ft A tar kettle should be filled no more than _______ of capacity: --------- CORRECT ANSWER-----------------75% Whom should you call for a DOSH permit? ---------CORRECT ANSWER----- ------------The district or field office of the Division of Occupational Safety and Health (DOSH) Which safety method is not approved by Cal/OSHA on a 5:12 monolithic roof 25ft. high? ---------CORRECT ANSWER-----------------Warning lines and headers Intervals (spans) between roof jacks must not be more than: --------- CORRECT ANSWER-----------------10 ft
A roofing job site should have fire extinguishers placed: ---------CORRECT ANSWER-----------------One on the roof and one on the ground Which type of fire extinguisher must be used near a hot tar kettle in use on a roofing job? ---------CORRECT ANSWER-----------------BC If there is a potential fall of over 7 1/2 feet, Cal/OSHA requires: --------- CORRECT ANSWER-----------------Railings or Periphery cables or Safety belts or ropes Cal/OSHA would approve of the following practice on a 4:12 roof: --------- CORRECT ANSWER-----------------Carrying two buckets at once on the roof A railing is required on work surfaces _______ or higher from the ground. -- -------CORRECT ANSWER-----------------7 1/2 ft Ladder rungs must be spaced _______ apart and be at least _______ long. ---------CORRECT ANSWER-----------------12" ... 11 1/2" In a work place travel distance to a fire extinguisher must not be more than: ---------CORRECT ANSWER-----------------75 ft
A roof has a 7' run and 8" per unit rise. What is the total rise at the ridge? -- -------CORRECT ANSWER-----------------56" Which of the following is NOT used as a weathering surface in single-ply roofing? ---------CORRECT ANSWER-----------------Mica If you know the lengths of two sides of a right angle, can you figure the length of the third side? ---------CORRECT ANSWER-----------------Yes, the third side squared = a2 + b The maximum heating temperature for steep asphalt is: ---------CORRECT ANSWER-----------------525F What is the flash point of a coal-tar pitch kettle? ---------CORRECT ANSWER----------------- 240 - 280F What is the name of the thick, black, gummy plastic used for making temporary repairs to damp roof surfaces? ---------CORRECT ANSWER------ -----------Wetpatch Where are sump drains usually installed? ---------CORRECT ANSWER------ -----------Wood decks
Which would be used to strengthen the eaves of a gable roof? --------- CORRECT ANSWER-----------------Fascia For spans less than 10ft, what is the minimum size lumber that may be used with a roofing jack? ---------CORRECT ANSWER-----------------2" x 6" Cal/OSHA may impose _______ concerning machinery. ---------CORRECT ANSWER-----------------Fines and/or restraining orders Trusses should be spaced _______ apart for tile roofs. ---------CORRECT ANSWER-----------------2'-6" Which of the following does not influence the exposure of wood shingles? -- -------CORRECT ANSWER-----------------Type of sheathing Which of the following is least hazardous to your health? ---------CORRECT ANSWER-----------------Hypalon What is NOT a requirement when you reroof over a built-up roof? --------- CORRECT ANSWER-----------------The deck must be torn up Which of the following is not a correct statement about PVC sheet-laying adhesives? ---------CORRECT ANSWER-----------------The overlap should be 10"
A raised delamination of roofing material usually caused by expansion of trapped water vapor or other gases is called? ---------CORRECT ANSWER- ----------------A blister In a 6" star pattern, how many chalk lines are needed? ---------CORRECT ANSWER----------------- 1 What is considered medium pitch for cold-process roofing? --------- CORRECT ANSWER-----------------1/2" per foot To correctly prepare a single-ply roof over concrete, what is needed first? -- -------CORRECT ANSWER-----------------Solvent For corrugated steel and aluminum roofing, what is the minimum headlap? ---------CORRECT ANSWER-----------------6" A gable (pitched) roof has a ridge 30ft long. It is 12 ft from the eave to the ridge. What is the total square footage for the entire roof? --------- CORRECT ANSWER-----------------720 sq ft A gable (pitched) roof has a ridge 28ft long. It is 13 ft from the eave to ridge what is the total square footage for the entire roof? ---------CORRECT ANSWER-----------------728 sq ft
How many roofing squares of material would be needed for a roof with 728 sq ft? ---------CORRECT ANSWER----------------- 7 - 1/ Which of the following structures requires a Class-A roof? --------- CORRECT ANSWER-----------------A hospital Which method of application is not generally used for cold-applied roofing? ---------CORRECT ANSWER-----------------Mopping To preserve health while working in a toxic atmosphere: ---------CORRECT ANSWER-----------------Use a self-contained breathing apparatus (SCBA) A "chicken" or cleat ladder is sometimes used as a safety device for walking on: ---------CORRECT ANSWER-----------------Steep slopes Buckets for carrying hotstuff have a maximum capacity of: --------- CORRECT ANSWER-----------------6 gal Mop buckets have a maximum capacity of: ---------CORRECT ANSWER---- -------------9 1/2 gal The color of coal-tar pitch at its flash point is: ---------CORRECT ANSWER-- ---------------Bright orange
