IIBEC - RRO Study Guide Exam with
All Correct Answers 2025/2026
Updated.
When is it appropriate for a change directive to be issued? - Answer When total agreement
on the terms of the change order cannot be reached in a timely manner.
Who controls the delivery, storage, and handling required for project materials? - Answer
The contractor
Who is responsible for providing the RRO with personal protection equipment? - Answer
RRO's employer
A contractor is installing an SPF roof. At a minimum, how many degrees should the ambient
temperature be above the dew point for this roof? - Answer 5 degrees F [2.8 degrees C]
A __________ measures thickness of the coating during application. - Answer Wet mil gauge
According to NRCA, which two metals are solderable? - Answer Galvanized steel and
stainless steel
When installing fire- and pressure-treated wood shake and shingles, which nail must be used? -
Answer 316 SS (stainless steel)
Which two deck types are considered nailable? - Answer Wood, plywood, and OSB
The RRO is observing the Contractor install a 1/2" (13 mm) wood fiber cover board over the
base layer of insulation; however the Construction Documents state that a 3/4" (19 mm) perlite
cover board is to be installed. What should the RRO do? - Answer Notify the Contractor,
record the deviation and contact the Designer Authority.
How would a change to the Specifications be made prior to the submittal of bids? - Answer
Addendum
What seaming procedure is appropriate for TPO membranes? - Answer Hot air welding
, The RRO observes that the temperature of the roofing asphalt at the point of application is too
low. How should the RRO determine what the proper asphalt temperature at the point of
application is? - Answer Review the EVT of the asphalt.
What could be a cause of blistering on an SBS roof? - Answer Voids in the interply moppings
What surface textures are acceptable for SPF? - Answer Smooth, orange peel, coarse orange
peel, or verge of popcorn
Per OSHA, what is the proper distance from the wall that the base of a ladder should be placed?
- Answer 1/4 the working height
Who would document and quantify unforeseen conditions? - Answer RRO
The RRO is reviewing the installation of a roof system over a steel deck. The RRO observes that
the deck has been modified in order to accommodate the installation of piping with an opening
between 8 in. to 13 in. (200 mm to 325 mm) in diameter. The RRO is concerned about the
integrity of the deck around this opening. What action should the RRO take? - Answer
Document the condition and contact the Designer of Record for direction.
A roof is 85 squares in area. The Contractor has 1/8th of the total roof left to complete. What
area has been completed so far? - Answer 7,438 sq. ft.
When installing asphalt shingle on a plywood deck, what is the MINIMUM depth the nails
should penetrate through the plywood deck? - Answer 1/8" (3 mm)
According to the NRCA Roofing Manual, how often should a termination bar be fastened on
singleply base flashings? - Answer Every 12" (300 mm)
What is the MAXIMUM roof slope recommended for the application of a coal-tar roof? - Answer
Less than 1/4" per foot
Proper documentation of Contractor manpower, crew size, weather conditions, and weather
related work stoppages can be used to determine what? - Answer If contract time extensions
are granted, or if financial penalties are imposed
ASTM D312 - Standard Specification for Asphalt Used in Roofing lists four types of roofing
asphalt based on resistance to flow. The preferred type of asphalt for a built-up membrane
being installed on a roof having a slope greater than 1:12 is - Answer Type IV Asphalt
All Correct Answers 2025/2026
Updated.
When is it appropriate for a change directive to be issued? - Answer When total agreement
on the terms of the change order cannot be reached in a timely manner.
Who controls the delivery, storage, and handling required for project materials? - Answer
The contractor
Who is responsible for providing the RRO with personal protection equipment? - Answer
RRO's employer
A contractor is installing an SPF roof. At a minimum, how many degrees should the ambient
temperature be above the dew point for this roof? - Answer 5 degrees F [2.8 degrees C]
A __________ measures thickness of the coating during application. - Answer Wet mil gauge
According to NRCA, which two metals are solderable? - Answer Galvanized steel and
stainless steel
When installing fire- and pressure-treated wood shake and shingles, which nail must be used? -
Answer 316 SS (stainless steel)
Which two deck types are considered nailable? - Answer Wood, plywood, and OSB
The RRO is observing the Contractor install a 1/2" (13 mm) wood fiber cover board over the
base layer of insulation; however the Construction Documents state that a 3/4" (19 mm) perlite
cover board is to be installed. What should the RRO do? - Answer Notify the Contractor,
record the deviation and contact the Designer Authority.
How would a change to the Specifications be made prior to the submittal of bids? - Answer
Addendum
What seaming procedure is appropriate for TPO membranes? - Answer Hot air welding
, The RRO observes that the temperature of the roofing asphalt at the point of application is too
low. How should the RRO determine what the proper asphalt temperature at the point of
application is? - Answer Review the EVT of the asphalt.
What could be a cause of blistering on an SBS roof? - Answer Voids in the interply moppings
What surface textures are acceptable for SPF? - Answer Smooth, orange peel, coarse orange
peel, or verge of popcorn
Per OSHA, what is the proper distance from the wall that the base of a ladder should be placed?
- Answer 1/4 the working height
Who would document and quantify unforeseen conditions? - Answer RRO
The RRO is reviewing the installation of a roof system over a steel deck. The RRO observes that
the deck has been modified in order to accommodate the installation of piping with an opening
between 8 in. to 13 in. (200 mm to 325 mm) in diameter. The RRO is concerned about the
integrity of the deck around this opening. What action should the RRO take? - Answer
Document the condition and contact the Designer of Record for direction.
A roof is 85 squares in area. The Contractor has 1/8th of the total roof left to complete. What
area has been completed so far? - Answer 7,438 sq. ft.
When installing asphalt shingle on a plywood deck, what is the MINIMUM depth the nails
should penetrate through the plywood deck? - Answer 1/8" (3 mm)
According to the NRCA Roofing Manual, how often should a termination bar be fastened on
singleply base flashings? - Answer Every 12" (300 mm)
What is the MAXIMUM roof slope recommended for the application of a coal-tar roof? - Answer
Less than 1/4" per foot
Proper documentation of Contractor manpower, crew size, weather conditions, and weather
related work stoppages can be used to determine what? - Answer If contract time extensions
are granted, or if financial penalties are imposed
ASTM D312 - Standard Specification for Asphalt Used in Roofing lists four types of roofing
asphalt based on resistance to flow. The preferred type of asphalt for a built-up membrane
being installed on a roof having a slope greater than 1:12 is - Answer Type IV Asphalt
