One clogged primary drain in monsoon puts 8,000 lbs of standing water on your flat roof looking for a way through the deck. I audit primary and overflow drainage against IPC 1108, map ponding zones, and score sump and canale condition — so your roof drains the way code says it should.
Primary drain capacity vs NM monsoon rainfall math
Overflow scupper compliance per IPC 1108 / IBC 1503.4
Sump slope and ISO tapered board scoring
Ponding-zone mapping with 48-hour rule
Canale corrosion and liner condition audit
Written scope with prioritized drainage fixes
Full flat-roof walk with drainage focus. Primary drain capacity math vs NM 1-hr monsoon intensity. Overflow scupper presence and compliance check (IPC 1108, IBC 1503.4). Sump slope verification with digital level; ISO tapered board recommendation. Ponding-zone mapping using the 48-hour standing-water rule. Canale corrosion, liner, and outlet-sizing audit (pueblo/adobe-style). Written scope with prioritized drainage fixes and cost bands.
NM commercial and residential owners with flat or low-slope roofs. Owners with visible ponding or interior leaks after monsoon. Buyers under contract on flat-roof commercial buildings. Property managers with multi-property drainage complaints. Owners of pueblo/adobe-style homes with traditional canale drainage.
Verbal Walk — $149 Standard Drainage Report — $399 Detailed w/ Ponding Map + Capacity Math — $649 Commercial >10,000 sqft — $0.06–$0.12/sqft Most drainage inspections are $399–$649. Adding code-required overflow scuppers before a monsoon collapse claim saves $15,000–$80,000+ in deck and interior damage.
Yes. IPC 1108 and IBC 1503.4 require secondary (overflow) drainage independent of the primary system on any parapeted flat roof. Most NM homes built before 2015 don't have them — one clogged primary drain in monsoon and 8,000 lbs of standing water is on your roof looking for a way through the deck.
The 48-hour rule: any water sitting after 48 hours of dry weather is ponding, and it accelerates membrane failure by 3–5×. I map ponding zones with a level tool and score sump condition — most 'flat' roofs need re-sloped ISO board at the sumps, not a full replacement.
Traditional adobe/pueblo canales are beautiful and leak-prone. Corroded metal liners, undersized outlets, and no overflow protection are the norm. I audit each canale, score corrosion, and give you a repair-vs-reline-vs-convert scope.
Pre-listing & buyer due-diligence reports.
Reserve study + per-unit documentation.
Party-wall + shared-roof attribution.
Step, counter, cricket flashing audit.
I've watched too many neighbors sign contracts they didn't understand for roofs they didn't need. That stops with a written report they own.