IFC Cost Estimation & Budgeting 3 — Questions and Answers
Question 1: A firestop estimator is comparing two sealant products: Product A costs $12/tube and covers 4 linear feet per tube; Product B costs $9/tube and covers 3 linear feet per tube. Which product has the lower cost per linear foot?
- Product A at $3.00/LF
- Product B at $3.00/LF
- Both products cost the same per linear foot (Correct answer)
- Product A at $2.50/LF
Correct answer: Both products cost the same per linear foot
Product A costs $3.00/LF ($12÷4) and Product B also costs $3.00/LF ($9÷3), making them equivalent on a per-linear-foot basis.
Question 2: In IFC firestop project budgeting, what is the purpose of including a 'deficiency correction' line item?
- To cover costs of upgrading materials after installation
- To budget for rework when penetrations fail inspection or are installed incorrectly (Correct answer)
- To pay for permit revisions
- To account for escalating labor rates
Correct answer: To budget for rework when penetrations fail inspection or are installed incorrectly
A deficiency correction line item covers the cost of rework when penetrations are found non-compliant during inspection, which is a normal risk on firestop projects.
Question 3: Which estimating database is most commonly referenced by US firestop contractors when establishing benchmark unit costs?
- ASHRAE Handbook
- RSMeans Construction Cost Data (Correct answer)
- NFPA 101 Appendices
- IBC Commentary tables
Correct answer: RSMeans Construction Cost Data
RSMeans Construction Cost Data is the industry-standard reference for benchmark labor and material unit costs used by US contractors across all trades including firestop.
Question 4: A firestop subcontractor is bidding a project where 30% of penetrations are in occupied, operational areas requiring night-shift work. How should this impact the labor estimate?
- Apply a shift premium multiplier to the affected labor hours (Correct answer)
- Use the same labor rate as daytime work
- Reduce the labor hours because the building is already built
- Add 5% to the total material cost
Correct answer: Apply a shift premium multiplier to the affected labor hours
Night-shift or premium-time work in occupied buildings requires applying a shift differential or premium multiplier to the labor hours worked in those conditions.
Question 5: What is the primary reason firestop estimates on renovation projects often exceed original budgets?
- Higher material costs than new construction
- Unforeseen penetrations and non-compliant existing conditions discovered during demolition (Correct answer)
- Stricter inspector requirements
- Longer project schedules
Correct answer: Unforeseen penetrations and non-compliant existing conditions discovered during demolition
Renovation projects frequently reveal undocumented penetrations and non-compliant existing firestop conditions that were not visible during the estimating phase.
Question 6: Which method provides the most accurate firestop quantity takeoff for estimating purposes?
- Estimating by floor area (SF) of the building
- Counting and categorizing each penetration by type and size from construction documents (Correct answer)
- Using a percentage of the mechanical/electrical contract value
- Applying industry averages based on building occupancy type
Correct answer: Counting and categorizing each penetration by type and size from construction documents
Counting and categorizing each penetration by type and size from the drawings provides the most accurate basis for material and labor quantities.
Question 7: Under IFC Premier Certificate guidelines, how should a contractor handle the cost of providing as-built firestop documentation at project closeout?
- Treat it as a general condition and include it in overhead
- Price it separately as a distinct line item in the estimate (Correct answer)
- Exclude it since the GC is responsible
- Include it only if the owner requests it
Correct answer: Price it separately as a distinct line item in the estimate
As-built documentation is a distinct, time-consuming deliverable that should be priced as its own line item to ensure adequate resources are allocated.
IFC Cost Estimation & Budgeting 3
A firestop estimator is comparing two sealant products: Product A costs $12/tube and covers 4 linear feet per tube; Product B costs $9/tube and covers 3 linear feet per tube.
Which product has the lower cost per linear foot?