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1 C-39 Roofing Trade Practice Exam Newest 2025/2026 Complete 70 Questions And Correct Detailed Answers (Verified Answers) [Already Graded A+||Brand New Version! Composition flashing (base flashing) should be fastened with: - ....ANSWER ...W Ww One- inch solid cap-head nails or Nails driven theough tin disks Pitch pockets or pitch boxes: - .... ANSWER ... 4 w 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? - — ANSWER ... 4% WM 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: - — ANSWER ...~# WY A vapor retarder or 2! A venting sheet Steel decks should be at least _ ANSWER ... 4 / 22g __ or heavier. - Insulation applied to steel roof decks before the roof membrane is installed should be applied: - ..... ANSWER ... J J In two separate layers where insulation thickness permits The top flanges of a steel roof deck should be installed: - ....ANSWER ...W% W Perpendicular to the roof slope The maximum deflection allowed for a steel deck is: - — ANSWER... 4 & 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. - .... ANSWER... 4 Y 1/2 inches ... 12 inches 4| 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. - ....ANSWER .. 4 4 32/16 On plywood decks not covered with insulation, a base ply should be ____ to serve as as the base ply of the roof membrane. - .... ANSWER... ~ # Attached with annular-threaded nails The choice of membrane type for a roof is frequently determined by: - .... ANSWER ...W% W# Geographical location and Climate Technical information useful in the selection of roof membranes is provided by the: - ..... ANSWER... 4% 4 National Bureau of Standards On low-sloped roofs, felt should be laid ___ the flow of water, beginning at ______ points in the deck. - sees ANSWER ...~# Ww Perpendicular ... low 5] On slopes over 2 inches per foot, felt should be laid: - —_ ANSWER ...W YW 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: - .....ANSWER ... 4 wW 3 inches per foot A roofing contractor discovers damage done by other trades to a newly installed roof. What should the roofing contractor do? - ....ANSWER ...~ YW 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: - ....ANSWER..Y7 4 Welding If final surfacing is not installed, roofing felts already installed should be: - .... ANSWER... f~ w "Glazed" and sealed at the end of each days work The bending radius of compositional roofing materials is generally limited to: - ..... ANSWER ..Ww yw 45 degrees 7| When installing sheet-laying adhesives, the overlap should be: - ..... ANSWER ... 4 w 10" Which of the following are used to carry hot asphalt? - sees ANSWER ...W WY Pouring can or Roofer's bucket or Lowboy Loads should be placed only over supporting beams and trusses on: - .... ANSWER ... Ww Ww Plywood decks What type of fire extinguisher should be used to put out an asphalt kettle fire? - ... ANSWER ..w w Dry chemical When installing composite shingles on a roof with a slope of less than 3:12, a common practice is to: - — ANSWER ... Ww W Use double layers of 15 pound felt for an underlayment You must notify DOSH if asbestos concentrations reach: - ....ANSWER ... 4% 4 0.1% One of the disadvantage of using Hypalon is that it breaks down when exposed to: - .... ANSWER .. 4 4 None of the above, Hypalon is resistant to all of these Sections of metal roofing are usually referred to as: - tease ANSWER ... 4 /% Pans The best roofing method for metal roofs that have only a slight slope is to use a: - .... ANSWER... 4 & 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. - .... ANSWER ... #% YW 3:12 Flat seam roofs of slight pitch should be divided by expansion battens into sections not exceeding: - sees ANSWER... WwW ¥Y 30 ft square Before installing a flat seam roof, a wood deck should be covered with: - .... ANSWER... 47 w 30 lb felt 10 | Which is lowest on the galvanic scale? - ....ANSWER uJ oS Steel Which has the least rigidity? - .... ANSWER... yf # 16 0z soft copper When joining 22 oz copper sheets, which procedure would produce the strongest joint? - ..... ANSWER ..&% S&S Sheets lapped, riveted, and soldered A 10' length of stainless steel will expand ____ temperature increase of 100*F - ....ANSWER.. 47 4 1/8" Sheet copper is over ______ wide. - .... ANSWER... 4% 4 24" How much will copper expand in 10' over a 100*F temperature change? - ....ANSWER... 4 W 1/8" Which is the most common method of mastering copper to a substrate? - ..... ANSWER ... 4 w Cleating 11 | Brackets used to support gutters should be installed on 3' centers and secured by: - .... ANSWER... 47 # 2 fasteners The maximum permitted length of a gutter is______ between ends or expansion joints. - ....ANSWER WH SF 50" Joints in gutters should be lapped 1" riveted on ____ centers, and soldered. - .... ANSWER ..Yf WY 2" The plan area of a building is 2,600 sq ft of roofing with a design factor of 1.10. The downspout for the gutter will drain 200 sq ft of roof area per 1 sq in of downspout area. What should be the area for the downspout? - tease ANSWER ... 4 &Y 14.3 sq in You are installing a galvanized steel roof and the plans call for a built-in gutter. Which metal should you use for the gutter? - ..... ANSWER ...~ w Stainless steel When designing a rectangular gutter, the minimum ratio of depth to width should be: - .... ANSWER ..Y% WY 3 to 4 13 | 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? - — ANSWER ... Ww WY Require crew to wear supplied-air respirators What thickness of zinc coating is placed on steel sheets to create galvanized sheets? - .... ANSWER... 4 & 1.25 0z/sq ft What type of flux is used to solder copper? - —_ ANSWER... ~ 4 Cut acid Which solder is best for copper? - ....ANSWER .. WW 50/50 tin-lead Acid flux residue can be removed with what liquid? - — ANSWER ...W YW 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: - .... ANSWER ...W% Ww Asphaltum paint 14| What is the correct exposure for #235 asphalt shingles? - ....ANSWER .. 4% w 5" Of the following, the most common size of drip edge is: - ....ANSWER ... 4% A 2" x 2" The purpose of an expansion joint is: - ....ANSWER ..S% JS Separate two building sections to allow expansion of materials without damaging the waterproofing system Approximately how many pounds of material is required for one square of a 3-ply asphalt and gravel roofing job? - ....ANSWER ... 4 w 300lb The purpose of installing a can't strip is to support the: - ..... ANSWER ... 4 Ww Base flashing What is the minimum depth to ratio for half-round gutters? - .... ANSWER ... 4 WY 1:2 What is the minimum height a ladder should extend beyond the landing? - ..... ANSWER... WW 36" 16 | Intervals (spans) between roof jacks must not be more than: - .... ANSWER .. 7 w 10 ft A roofing job site should have fire extinguishers placed: - ....ANSWER ...W &@ 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? - .....ANSWER..~J4 BC If there is a potential fall of over 7 1/2 feet, Cal/OSHA requires: - ....ANSWER ... 4 Y Railings or Periphery cables or Safety belts or ropes Cal/OSHA would approve of the following practice ona 4:12 roof: - ....ANSWER ...W W Carrying two buckets at once on the roof 17| A railing is required on work surfaces ______ from the ground. - .... ANSWER .. 47 Y 71/2 ft or higher Ladder rungs must be spaced _______ apart and be at least long. - ....ANSWER ... 4 Y 12"... 11 1/2" In a work place travel distance to a fire extinguisher must not be more than: - .... ANSWER ...Y7 w 75 ft A fire extinguisher must be tested every: - .... ANSWER Jt oH Year What is the minimum distance a metal ladder should be from electrical equipment? - ....ANSWER...W w 4 ft What is the minimum distance a worker must be from an overhead high voltage line? - ....ANSWER..W~ W 6 ft Asbestos should be handled while: - .... ANSWER uJdt oS Wet 19 | Given that a sloped roof has an area of 1,160 sq ft. How many rolls of 15 pound felt (4 sq/roll) are needed to cover the roof with one layer? - .... ANSWER... 47 Ww 3 Which statement is most correct? - .... ANSWER... 4 &# Tar is distilled from soft coal Given a scale 1/4" = 1' what is 3'-6" - .... ANSWER uF oS 7/8" Which of the following is the correct order for installing a tile roof? - .... ANSWER ... 4 Ww Lay underlayment; snap chalkline; load tile; install tile What is the purpose of a shake liner? - .... ANSWER ..% & To waterproof the roof Which of the following are you most likely to use when nailing composition roof shingles on a felted plywood deck? - ....ANSWER .. ~ Y Coil nail gun 20 | Which of the following types of insulation cannot be used in direct contact with BUR? - .... ANSWER ..~4¥~ YW Polystyrene board How should you walk on a roof with flat concrete tiles? - ....ANSWER ...~ Y Step of the headlap of the tiles How would you load tile onto a roof? - .... ANSWER ..&% So Load 6 tiles high and 3 ft from the edge The chalk line for installing tile should be set - — ANSWER ... Ww WY Perpendicular to the eave In a moderate climate with a normal slope, how far should back flashing go upside off a chimney? - _ ANSWER ... 4 w 18" Why should you not install composition single roofs when the temperature is 40* F or below? - ....ANSWER ..&% & The shingles can crack too easily with handling and nailing What in the best way to prevent a leak behind a 36" wide masonry chimney? - ..... ANSWER ... 4 W Install a cricket 
