Compare sprayed, intumescent and board fireproofing for the specified scope
A hotel project receives a proposal to replace the specified board enclosure around stair columns with sprayed protection. The price looks attractive, but the proposal says little about interfaces or the finished appearance. You need a comparison that exposes those differences before a substitution review.
Compare the specified protection arrangement with the proposed one across design, exposure, finish, installation and inspection. Common options include cementitious and mineral-fibre sprayed materials, reactive intumescent coatings and rigid boards. These families describe different protection approaches; their names do not establish interchangeable ratings or suitability for a particular location.
Make the comparison useful for a decision
- Name the actual systems. Obtain the specified and proposed product information, complete design references and intended member locations. Record each system rather than writing only 'spray' or 'board'. A family comparison helps organize questions, but an approval decision needs the actual proposed construction.
- Describe how protection is formed. Sprayed materials provide an insulating layer, while intumescent coatings react and expand under high temperatures. Board systems use an enclosure arrangement. Separate cementitious and mineral-fibre spray proposals where their product instructions differ; do not transfer mixing or fixing methods between families.
- Compare the exposure and finish. Identify concealed, visible and exposed locations from the project documents. Ask how the proposed system meets the intended environment, appearance and durability requirements. Obtain any required topcoat or protective detail rather than assuming that a neat finish, denser material or extra paint makes it suitable.
- Compare the work arrangements. Have each installer describe access, equipment, storage, preparation and protection of neighbouring work. For boards, ask about the actual enclosure and fixing details; for coatings, ask about the specified application conditions. Record the practical effects on occupied space and trade access without inventing a universal installation duration.
- Compare inspection and later repairs. Ask the consultant and agency what evidence each proposed arrangement needs before enclosure. Include attachments, junctions and damaged areas in the discussion. Identify who can perform an approved repair and how its location will be recorded; a convenient patching method is not proof of equivalent protection.
- Prepare a substitution comparison. Put unresolved design, finish, exposure, interface and inspection questions beside the cost and schedule proposal. Send it through the project's review process and retain the decision. Do not brief the crew to change systems merely because one column treatment looks simpler.
Common mistakes
- Treating equal advertised hours as a complete equivalence check.
- Pricing the material while overlooking access and finished interfaces.
- Assuming every product in one family has the same exposure limits.
Checklist
Compare more than the family name
- Actual specified and proposed construction.
- Rating and location coverage.
- Exposure and required finish.
- Access, preparation and interfaces.
- Inspection, repair and decision record.
Check your understanding
Both proposals advertise the same hourly rating. Can the lower-priced family be instructed immediately?
