Antimicrobial area

First total the surfaces you are treating — floor, walls, and ceiling as applicable — which is what this tool does; give it areas directly or a perimeter and height for the walls. Then convert that treatment SF to product using your antimicrobial's labeled coverage rate (often a few hundred square feet per gallon of ready-to-use solution, varying by product). Always apply per the label, including any required contact or dwell time. The area figure feeds your estimate line; the coverage rate on the product label turns it into gallons you actually stage.

Antimicrobial is a professional judgment call under S500, not an automatic line on every water loss. It is well supported on Category 2 and Category 3 losses, where contamination is present, and where materials that stayed wet long enough to risk microbial growth are being dried in place rather than removed. On a clean, quickly-mitigated Category 1 loss it may not be warranted. Tie the application to the category and the documented conditions in your narrative — that is what keeps it defensible when the desk questions why antimicrobial appears on the estimate.

Treat every surface that was affected or contaminated, which is why this tool lets you enter floor, walls, and ceiling independently. On a Category 3 loss with water from overhead, or where wicking carried contamination up the walls, you treat the affected wall band and any impacted ceiling — not just the floor. On a floor-only clean loss you may only treat the slab or subfloor. Scope the surfaces your documentation supports, and let the total treatment SF reflect exactly those areas so the applied-area line matches the photos.