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TRADE & KNOWLEDGE ROOFING EXAM | ALL
QUESTIONS AND CORRECT ANSWERS |
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As per Walkers, on new work, where it is possible to estimate cost with a fair degree of accuracy, a contractor is entitled to ______ profit on the actual cost of the work (job overhead included in the actual cost of the job) ---------CORRECT ANSWER-----------------10% to 15% The stack of a roof relief vent in a built-up roof should extend at least _______ up from the membrane. ---------CORRECT ANSWER----------------- 12 inches It's best to use full-lace valleys only when the roof slope is --------- CORRECT ANSWER-----------------3 in 12 or steeper Thermal resistance (R) indicates a materials resistance to heat flow and is calculated as: ---------CORRECT ANSWER-----------------The reciprocal of (C) thermal conductance Which of the following is a single-point adjustable suspension scaffold consisting of a seat or sling designed to support one employee in a sitting position? ---------CORRECT ANSWER-----------------Boatswains chair To allow for expansion when wet, space shakes: ---------CORRECT ANSWER-----------------3/8 to 5/
___________ is the time rate of eater vapor transmission through unit area of flat material. ---------CORRECT ANSWER-----------------Permeance Drawings in which vertical lines are vertical, but horizontal linea are set at 30 or 60 degrees are: ---------CORRECT ANSWER-----------------isometric Asphalt shingles shall be secured to the roof with not less than _____ fasteners per strip shingle or ______ fasteners. ---------CORRECT ANSWER-----------------4: According to the architectural sheet metal manual, recommended height of a water diverter will vary with the pitch of the roof, but should not be less than_______ ---------CORRECT ANSWER-----------------4 inches Overflow scuppers installed in roofs shall have a minimum height of --------- CORRECT ANSWER-----------------2 in To keep water from getting under the shingles and seeping under the drip edge, at eaves the drip edge should be installed, ---------CORRECT ANSWER-----------------under the felt Metal roof shingles shall not be installed on roof slopes less than _______ - --------CORRECT ANSWER-----------------three units vertical in 12 units horizontal
In structural steel assembly , the permanent floors shall be installed as the erection of structural members progress , and there shall be not more than___________ between the erection floor and the uppermost permanent floor , except where the structural integrity is maintained as a result of the design. ---------CORRECT ANSWER-----------------8 stories As per Roofing Construction & Estimating , when backnailing underlayment in a two ply sealed system , nails should be spaced a maximum of --------- CORRECT ANSWER-----------------12 in. on center Which of the following is a standard for asphalt cements used in roofing? -- -------CORRECT ANSWER-----------------ASTM D 3019 In a high - velocity hurricane zone , not more than ________ of the total roof area of any existing building shall be repaired , replaced or recovered in any 12 month period unless the entire existing roofing system is replaced to conform to requirements of this code. ---------CORRECT ANSWER------- ----------25 percent What is the minimum slope NRCA recommends for structural metal panel roof assemblies? ---------CORRECT ANSWER-----------------1/2 inch per foot According to SMACNA, for standing seam roofs if the surface to receive the roofing is other that _________ , battens must be provided to receive the _________ ---------CORRECT ANSWER-----------------wood, cleats
Crickets or saddles shall be installed on the ridge side of any chimney greater than: ---------CORRECT ANSWER-----------------30 in Standard-sized slate that's 3/4 inch and thicker that is subject to high wind conditions should be fastened with _______ nails. ---------CORRECT ANSWER----------------- 4 When installing a base sheet on a built-up-roof with a polywood deck, all laps should be nailes on _______ ---------CORRECT ANSWER----------------
- 9 in centers Which type of bond would cover defects following completion of a job? ------ ---CORRECT ANSWER-----------------Maintenance Bond Wood roof trusses are used for spans as short as _______ and can be used up to _________ ---------CORRECT ANSWER-----------------25 feet, 200 feet As per Walkers, a short method of figuring roof area of a building with a toof pitch of 3/8 would be to take the entire flat or horizontal area of the roofand multiply this by a factor of: ---------CORRECT ANSWER--------------- --1. What does the following plywood standard indicate, APA 32/16? --------- CORRECT ANSWER-----------------the plywood can span a minimum of 32 inches between rafters.
When installing metal roof panels, what is necessary to prevent cambering or bowing along the edges? ---------CORRECT ANSWER----------------- Installing panels perpendicular with the eave The design dry bulb temperature for Miami in winter is _________ --------- CORRECT ANSWER-----------------46 degrees F What is the minimum gauge of copper recommended for batten seam roofs? ---------CORRECT ANSWER-----------------16 oz As long as mineral granules protect the roll roofing base material, mineral- surfaced roll roofing works well as ________ for long-life roof coverings. ---- -----CORRECT ANSWER-----------------An underlayment The recommended temperature for mop application of type III asphalt is _______ F, +/- 25 F. ---------CORRECT ANSWER-----------------430 degrees F +/-25 F Outlet tubes may be of any shape necessary to fit the downspout, but the outside dimension should be ______ less than the outside of the downspouts it serves. ---------CORRECT ANSWER-----------------1/8 inch When fabricating a conductor head it is recommended that the depth of its top opening equal _______ of its width. ---------CORRECT ANSWER--------- --------2/
OSHA: in structural steel assembly, the permanent floors shall be installed as the erection of structural membrane progress, and there shall be not more than _______ between the erection floor and the uppermost permanent floor. ---------CORRECT ANSWER-----------------8 stories NRCA. End laps for single layer underlayment for tile roofs should be a minimum of ---------CORRECT ANSWER-----------------4 inches To earn a class B fire rating fire retardant wood shingles or shakes must be installed over solid deck plywood or equivalent material of minimum --------- CORRECT ANSWER-----------------1/2 inch-thick OSHA. Powder-actuated tools shall be tested to see that safety devices are in proper working conditions ---------CORRECT ANSWER-----------------Daily NRCA What is the approximate coverage for 5 bundles of shakes using No 1 Hand-split mediums 24x12 with an exposure of 10 inches --------- CORRECT ANSWER----------------- 100 The length of step flashing can be determined by using the following general guideline: ---------CORRECT ANSWER-----------------Exposure + 3 inches = length of step flashing The base of smoke hatches and vents serve as counter flashing. Where the baee of the smoke hatch does not provide at least a _______ counter
What class of roof assemblies are effective against severe fire test exposure? ---------CORRECT ANSWER-----------------A A bond furnished by the contractor that guarantees he will sign a contract is a : ---------CORRECT ANSWER-----------------Bid bond Which of the following conditions would be more suitable to recover rather than replace the existing rood? ---------CORRECT ANSWER----------------- The existing roof has two or more applications of room covering already. NRCA recommends an EVT range for mop application or roofing asphalt as the temperature at which viscosity of _____ centipoise (cP) is attained, plus or minus 25 degrees F ---------CORRECT ANSWER----------------- 125 As per architectural sheet metal manual, formed gravel stop fascias should be installed with a 1/4 in. Opening between sections and these openings should be covered by a _____ in. cover plate formed to the profile of the gravel stop. ---------CORRECT ANSWER-----------------6in According to FBC when installing a built-up roof membrane, what is the maximum temperature allowed for coal tar pitch asphalt in a kettle or tanker? ---------CORRECT ANSWER-----------------400 degrees F ---------CORRECT ANSWER-----------------250 to 1000 predicted on thickness
Caution signs colors ---------CORRECT ANSWER-----------------Yellow and black When the two components of SPF liquid are combined the mixture expands up to ______ times its original liquid volume. ---------CORRECT ANSWER-- --------------- 20 - 30 As per Walker, the R rating for 1/2 (12.5 mm) Gypsum board is: --------- CORRECT ANSWER-----------------0. The overall coefficient of thermal transmission (U value) of an assembly is 0.10. The R-value of this assembly would be: ---------CORRECT ANSWER- ---------------- 10 Which of the following is NOT a standard thickness of butyl rubber waterproofing membranes? ---------CORRECT ANSWER----------------- 100 mils Primary purpose of roof insulation is ---------CORRECT ANSWER------------- ----Provide thermal resistance What is the MINIMUM recommended weight of copper used for standing seam roofing? ---------CORRECT ANSWER----------------- 16 - oz
Wood roof trusses are used for spans as short as_____ and can be used up to _____ ---------CORRECT ANSWER-----------------25 feet, 200 feet When installing SBS-polymer-modified bitumen membrane materials in hot bitumen, it is usually required that the bitumen be applied at a temperature: ---------CORRECT ANSWER-----------------Greater than the EVT EPDM membrane lap seams can be adhered using: ---------CORRECT ANSWER-----------------Adhesive seam tape Mineral-surfaced roll roofing works well as ________ for long-life roof coverings. ---------CORRECT ANSWER-----------------An underlayment Which of the following is incompatible with a BUR system? --------- CORRECT ANSWER-----------------Polystyrene insulation Which type of roofing system is popular, even though it's more expensive? ---------CORRECT ANSWER-----------------Wood shingles and shakes Four-ply coal-tar build up waterproofing membranes can resist hydrostatic pressure head of ________ of water. ---------CORRECT ANSWER------------ -----11 to 25 feet Terne-coated stainless steel, Type 304, is coated with a thin layer of --------- CORRECT ANSWER-----------------zinc and tin
When using wood roof trusses, it is common to span ---------CORRECT ANSWER-----------------The shorter dimension of the building Using the mortar set method and 12 tiles, each tile should be embedded in mortar applied with a filled ---------CORRECT ANSWER-----------------10 inch masonry trowel As per OSHA, what is the maximum permitted height of an unbraced masonry wall? ---------CORRECT ANSWER-----------------8 feet According to the architectural sheet metal manual, what is the minimum thickness of a 4" x 6" plain rectangular copper downspout? --------- CORRECT ANSWER-----------------16 Oz When using step or channel flashing where a tile roof area intersects a side wall, NRCA recommends extending the flashing a minimum of ______ up the wall. ---------CORRECT ANSWER-----------------4" inch When installing EPDM waterproofing, lay the membrane on the substrate or flat surface and allow it to relax for a minimum of ______ before use ----- ----CORRECT ANSWER-----------------30 minutes Which of the following is not a potential problem of ponding water due to the lack of drainage on a low slope roof? ---------CORRECT ANSWER------- ----------Membrane Seperation
According to the NRCA, what is the maximum exposure recommenced when installing 18"inch wood shingles on a slope of 4:12? --------- CORRECT ANSWER----------------- 5 - 1/2" According to the Florida Building Code - Test Protocols for High-Velocity Hurricanes Zones, asphaltic shingles shall be fastened using _______ approved nails per shingle. ---------CORRECT ANSWER----------------- 6 The NRCA recommends _____ plies of asphalt built-up membrane to resist 10" of hydrostatic pressure head. ---------CORRECT ANSWER----------------- 3 What is the area of a plain rectangular downspout with actual dimensions of 3" x 4"? ---------CORRECT ANSWER-----------------12.000 inches square What is the range of rib with for a wide rib steel deck? ---------CORRECT ANSWER----------------- 1 - 3/4" to 2-5/8" How many square feet will 5 bundles of 18" x3/8" shakes cover when applied with 1/2" spacing and an 8" exposure ---------CORRECT ANSWER- ----------------94 square feet According to roofing construction and Estimating, what in addition to underlayment is recommended to flash a full lace valley? ---------CORRECT ANSWER-----------------36" wide roll roofing (50lbs or heavier)
What is the minimum height for base flashing in a multi-ply membrane built- up roofing system? ---------CORRECT ANSWER-----------------8" According the architectural sheet metal manual, standing seam roofs utilizing the pan method. and. field formed method are recommenced for roofs having a slope of ____ per foot or greater. ---------CORRECT ANSWER-----------------1" According to roofing construction and estimating, when installing shingles across a valley, fasteners shall be a minimum of _____ from the centerline. ---------CORRECT ANSWER-----------------6" According to NRCa, what is the approximate coverage per square for a 24", No. 1 wood shingle with the maximum exposure? ---------CORRECT ANSWER-----------------100 square feet What is minimum thickness for galvanized steel valley lining material? ------ ---CORRECT ANSWER-----------------0.0179" Which go the following is recommended for falling the open valley of a tile roof system over an unsealed underlayment system? ---------CORRECT ANSWER-----------------26ga galvanized flashing, 2-1/2" water diverter and 1" water guards What is the average thickness of a piece of tapered insulation sloping from 2" to 6"? ---------CORRECT ANSWER-----------------4"
What type of nail should be used for a new roof with 24" taper split shakes? ---------CORRECT ANSWER-----------------5d Where required for roof drainage, a scupper shall be placed ______ the roof surface in a wall or parapet. ---------CORRECT ANSWER----------------- level with According to the NRCA Roofing and. Waterproofing Manual, which of the following is NOT a subcategory of thermoplastic roof membranes? --------- CORRECT ANSWER-----------------ethylene propylene diene monomer All material chutes, at an angle of more than 45 degrees from the horizontal, shall be entirely enclosed and shall be provided with an opening not to exceed _____ in height measured along the wall of the chute. --------- CORRECT ANSWER-----------------48" According to Roofing Construction & Estimating, you should install a galvanized iron cricket on the upper side of a chimney with a horizontal width greater than _____. ---------CORRECT ANSWER-----------------48" Liquid-applied neoprene coating at joints in roof systems can be reinforced with ---------CORRECT ANSWER-----------------fiberglass Asphalt shingles shall only be used on roof slopes of ______ or greater. ---- -----CORRECT ANSWER-----------------28 feet
According to the Florida Building Code- Test Protocols for High Velocity Hurricane zones, steel roof panels shall not exceed ______ of continuous length. ---------CORRECT ANSWER-----------------45 feet How should metal flashing at the edge of flat roofs be attached? --------- CORRECT ANSWER-----------------nailed in two rows on 3" to 4" centers What are the two common industry approaches used for determine thermal resistance of tapered insulation system? ---------CORRECT ANSWER-------- ---------average R-value and minimum R- value According to Florida Building Code, in high velocity hurricane zones, what is the maximum roof slope at which a loose laid ballast system can be used? ---------CORRECT ANSWER-----------------they are not allowed The rate of water vapor transmission per unit area at a steady state through a membrane is known as: ---------CORRECT ANSWER----------------- permeance According to Walker's Building Estimator's Reference Book, roofing felt is furnished in four square rolls containing ________ square feet. --------- CORRECT ANSWER----------------- 432 Steel deck panels should be anchored to the support members with a maximum spacing ______ on center. ---------CORRECT ANSWER------------ -----12"
