1 Exam Prep. NRCA Membrane Roof Systems Questions

Transcription

1 1 Exam Prep NR Membrane Roof Systems Questions 1. The preferred method of installing rigid insulation board to cementitious wood-fiber roof decks is? Spot mopping lind nailing Loose laid dhesion to the base sheet 2. The recommended steel panel roof deck gauge is or heavier Roofing materials normally should not be applied below what temperature? 40 degrees 50 degrees 32 degrees 90 degrees 4. Moisture in or on materials can cause? Slippage Fishmouths listering Skipping 5. The maximum mop application of Type IV asphalt is? 450 degrees 475 degrees 500 degrees 525 degrees 6. The minimum temperature for the application of Type I coal tar pitch is? 360 degrees 335 degrees 330 degrees 385 degrees 1 Exam Prep Membrane Roof Systems 1

2 7. NR recommends steel decks be gauge or heavier? When installing cellular-glass, multiple-layer insulation is required when the total thickness of the insulation is greater than? 3" 2" 1 1/2" 1" 9. When using perlite insulation as the primary insulation NR recommends layers / Multiple-layer insulation of wood fiberboard is recommended when the total required thickness of the insulation is greater than how many inches? 1 1/2 1 1/3 13/ The equiviscous temperature is? Proper melting point Minimum melting temperature Proper viscosity for application Flash point 12. itumen can be heated and held at the high temperatures for Long periods 1 hour 4 hours Short periods 13. The EVT range must be within degrees of viscosity at 125 centistokes. 10 F 15 F 20 F 25 F 1 Exam Prep Membrane Roof Systems 2

3 14. oal-tar Type I itumen has an application temperature of. (2011 Only) 375 F 360 F 350 F 450 F 15. When using EPM Membrane materials, should be avoided to prevent swelling. Glues Sand Hypalon oatings liphatic Solvents 16. EPM single-ply requires the use of to prevent wicking at exposed cut edges. ontact Solvents Silica Sand Sealant ut sheets 17. Rosin sheets work well to Prevent drippage ivorce roof membranes Provide adhesion Provide vapor migration 18. orrectly designed penetration pockets should have compatible Projections Sealant ripholes Sealing 19. NR recommends for slope and drainage that there be no ponding on the roof 8 hours after raining 24 hours after raining 12 hours after raining 48 hours after raining 20. When installing UR roof drains, copper must be inches square Exam Prep Membrane Roof Systems 3

4 21. Overheating bitumens can cause Poor dhesion Flash hazards Slippage Yellow smoke 22. ase flashing height for tatic smooth surface roofing should not be lower than 8 inches 6 inches 10 inches 5 inches 23. Raised curbs using UR roofing should be flashed a minimum of 8" 10" 12" 14" 24. There should be no evidence of standing water on the deck hours after it stops raining When determining the thermal resistance of a tapered insulation system a common industry approach is verage thickness value Minimum R value Maximum R value 26. old rolled ribs lighter than gauge have little strength Exam Prep Membrane Roof Systems 4

5 27. Intermediate rib decking has a maximum rib opening of how many inches? 1 1 3/4 2 2 ½ 28. Spacing between side lap fasteners should not exceed how many feet? The weld spacing along the perimeter should be inches ellular glass board is approved at inches minimum thickness /2 1 3/ There should be no evidence of water on the roof hours after it stops raining ccording to the NR manual, the Equiviscous Temperature range is defined as 125 centistokes 125 centistokes plus 25 degrees Fahrenheit 125 centistokes plus or minus 25 degrees Fahrenheit 125 centistokes minus 25 degrees Fahrenheit 1 Exam Prep Membrane Roof Systems 5

6 33. ccording to the NR manual, the roofing contractor should take special precautions when the temperature is below how many degrees? Loose-laid EPM single-ply systems require the use of to provide resistance against winduplift forces. Screw fasteners Special adhesives Heat applied seams allast 35. One of the more common types of insulation layers is 15 pound asphalt felt 30 pound fiberglass Fiberglass insulation oard insulation 36. ccording to the NR manual, asphalt shall be applied at a temperature within degrees of the equiviscous temperature There are how many subcategories of common Thermoplastic membranes? Field lap seams when installing EPM are typically constructed with urable locks Snap caps Seam tape Heat seams 1 Exam Prep Membrane Roof Systems 6

7 39. four-way slope, high point of 12 and low point of 3 can provide uniform perimeter epth Width Temperature Thickness 40. When installing cementitious wood fiber decks, type fasteners should be used. uger One Piece Tube nails Three Piece Tube nails Nylon expansion fasteners 41. For added benefit NR recommends insulation be applied a minimum of layers? Mop Temperature for Type IV asphalt is 350 F 425 F 450 F 475 F 43. Type II STM 312 is asphalt? eadlevel Flat Steep Special 44. The Equiviscous Temperature range must be plus or minus 10 F 15 F 20 F 25 F 45. Substituting adhesives in thermoset single-ply roofing is Good ad Ugly Recommended 1 Exam Prep Membrane Roof Systems 7

8 46. When using EPM Membrane materials, which of the following will prevent wicking? Seam sealant orn oil Lard Solvents 47. Fishmouths in thermoset roofing should be ut Spliced onded Hot mopped 48. The minimum square inches for the lead sheet when installing roof drains is ase flashing height should not be lower than inches The building is located in a 90 mph basic wind speed region in Exposure "". The maximum allowable height of the building if using gravel is 100 feet 110 feet 120 feet 90 feet 51. Number 4 aggregate ballast is typically applied at a coverage rate of about pounds per 100 square feet for loose-laid ballasted membrane roof systems. 2,000 1,300 1,500 2,500 1 Exam Prep Membrane Roof Systems 8

9 52. When using nails with cementitious wood-fiber, NR suggests using arbed clip fasteners Two-piece tube nails Three-piece tube nails Toggle bolts 53. Intermediate rib decking has a maximum nominal rib opening of inches. 1 13/4 2 2 ½ 54. metal roof deck should be welded no more than how many inches on center? allast systems should be designed using Patterns Thickness Porosity Weight calculations 56. Mineral surfaced cap sheets should be unrolled and allowed to relax for how long? Eight hours Until soft and pliable Four hours Until flat 57. The two general categories of metal roofing systems are and Water shedding and water repellant rchitectural and field engineered Waterproof and water-resistant old-rolled and panel 1 Exam Prep Membrane Roof Systems 9

10 58. The tanker temperature should always be less than how many degrees below the actual flash point of coal tar bitumen? When installing insulation board for cement-wood fiber decks, the maximum elevation difference allowed is 2" 1" 1/2" 1/8" 60. Type "F" decking has flute spacing of 1 inch maximum 1 to 1 3/4 inches 1 3/4 to 2 5/8 inches 1 1/2 to 2 3/4 inches 61. Vapor retarders should be used to ontrol the flow of moisture vapor from the interior of the building into the roof system ontrol the flow of moisture vapor from the exterior of the building into the roof system Remove the moisture vapor from the interior of the building Remove the moisture vapor from the exterior of the building 62. Which of the following is not a type of rigid roof insulation? Perlite Vermiculite Polystyrene Mineral fiber 63. sphalt with a maximum softening point of 225 degrees is Type I Type II Type III Type IV 1 Exam Prep Membrane Roof Systems 10

11 64. Moisture in or on materials can cause membrane eterioration Softening listering uckling 65. Type III asphalt is for slopes up to 1/4:12 1/2:12 1:12 3: Type IV asphalt is suggested for slopes greater than 1/4:12 1/2:12 1:12 3: The NR states lightweight structural concrete has a density of not less than pcf? Which of the following is not a type of rigid roof insulation? ellular glass Spun glass modules Wood fiberboard Gypsum board 69. Type I asphalt requires a minimum mop application temperature of how many degrees? ccording to the NR, 24 inch by 24 inch roof mounted equipment requires support height of inches Exam Prep Membrane Roof Systems 11

12 71. NR recommends the height of a base flashing be no lower than how many inches? typical Type F deck panel should have a minimum rib width of inches? 1 1 1/2 1 3/4 ½ 73. rigid board made from crushing glass and mixing it with hydrosulfide gas is Roof covering ecking ellular-glass vapor barrier 74. The maximum slope required for low slope roofing is 1:12 2:12 4:12 3: The temperature of the hot asphalt should be measured t the kettle On the roof t the pipe fter installation 76. TPO is available in all except mils? ased on dew-point calculation and to limit possible condensation and premature degradation of materials, a designer should consider Installing more than normal insulation Provisions for a vapor retarder n extra layer of hot mop or cold process depending upon the roof style The use of a deck sealer 1 Exam Prep Membrane Roof Systems 12

13 78. Type 1 low-softening point asphalt cement is governed by STM 312 STM 4586 PR 6977 STM Which is not an advantage of Ethylene Propylene iene Monomer roofing? Resistance to ozone Weathering brasion Resistance to vegetable oils 80. ccording to the NR, the softening point for Type I asphalt is how many degrees Fahrenheit? 210 to to to to Which is not property of a rigid board roof insulation system? Moisture resistance R-value ompressive strength Tactile compatibility 82. Which of the following is not a common subcategory of thermoplastic membranes? PV P EIP IP 83. The STM standard governing polyisocyanurate foam board roof insulation is The minimum R-value approach establishes the thermal resistance for a tapered roof insulation system by determining the R-value of the tapered material at the Thickest point in the tapered system layout Thinnest point in the tapered system layout verage point in the tapered system layout ny point in the tapered system layout 1 Exam Prep Membrane Roof Systems 13

14 85. Which is not a common subcategory of thermoplastic membranes? EPM KEE TPO PV 86. The tapered systems is 6 inches at the thickest point and 2 inches at the thinnest point. Using the verage R- Value approach, the R-value of the tapered system is Valued at how many inches of thickness? aution should be used when applying roofing materials below what temperature? 40 degrees entigrade 50 degrees Fahrenheit 50 degrees entigrade 40 degrees Fahrenheit 88. EVT is defined as the temperature at which the viscosity of roofing asphalt is Explosive t flash point Emits yellow smoke 125 s 89. Type III asphalt may be used on roof slopes or less? 1/4 inch per foot 1/2 inch per foot 3/4 inch per foot 1 inch per foot 90. When applying polymer-modified asphalt roofing, the contractor should use Low kettle temperatures etailed torch kits oal tar roof cements sphalt roof cements 91. Kettle temperature should be maintained at less than how many degrees below flash point? Exam Prep Membrane Roof Systems 14

15 92. When applying modified bitumen membrane sheets directly to combustible substrates such as wood decks, NR recommends Not using a torch Using a torch Nailing the rosin paper Not using rosin paper 93. The maximum temperature for the application of Type 2 asphalt for mop applications Is 350 degrees F 375 degrees F 400 degrees F 425 degrees F 94. The two types of vapor retarders are? Hydrostatic and hydrokinetic itumen and plastic sheet or film vapor retarders (non-bitumen) Semi-permeable and permeable Type 1 and Type 2 1 Exam Prep Membrane Roof Systems 15

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