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C- 39 ROOFING TRADE PRACTICE TEST 1 AND 2 | ALL QUESTIONS AND
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C-39 ROOFING TRADE PRACTICE TEST 1
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
Pad-type compositional walk pads should be spaced no closer than: --------- CORRECT ANSWER-----------------6 inches For application between membrane plies, bitumen should be applied at a rate of approximately _______ per 100 sq ft. ---------CORRECT ANSWER-- ---------------15 to 35 pounds What is the lowest slope allowed for a wood shake roof with 2 layers of 15 lb felt? ---------CORRECT ANSWER-----------------3: The proper nailing of three-tab asphalt shingles is: ---------CORRECT ANSWER-----------------1" from the sides and 5/8" above the slots 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 Roofer's bucket or
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 Composition flashing (base flashing) should be fastened with: --------- CORRECT ANSWER-----------------One- inch solid cap-head nails or Nails driven theough tin disks Pitch pockets or pitch boxes: ---------CORRECT ANSWER-----------------Are not recommended because they require extensive maintenance Reinforced concrete can be used as a structural deck. Which of the following is a correct statement? ---------CORRECT ANSWER----------------- Some moisture will remain in concrete decks even after the surface is dry 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
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 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 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-- --------------- 5 0 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
