Topic hub · Year-round
Fire and life safety
Suppression, alarm, egress, and the fire-protection and electrical-safety work that has to pass inspection.
Electrical
PV rapid shutdown (NEC 690.12)
De-energize the roof array on one action: the inside and outside boundary limits, MLPE, the listed PVRSS, the firefighter-accessible switch, and the commissioning test that proves it drops.
Electrical
Intrusion alarm field guide
Design the detection layers and place the sensors to catch a real entry without the false alarms, then run dual-path signaling, verification, and a walk test.
Electrical
Hot work permit field guide
Prohibit, relocate, or protect the work, clear 35 ft, keep a fire watch during and after, and sign the permit that forces the checks.
Electrical
Working clearance (110.26)
Hold the clear space in front of the gear: the depth by voltage and condition, the width and height, the dedicated space above, the egress, and the storage that fails the inspection.
Electrical
DAS and public-safety radio
Two systems live in the same conduit. Cellular DAS needs the carrier's consent, and public-safety ERCES is a code-mandated life-safety system that has to work in a fire and pass the AHJ.
Electrical
Battery energy storage (BESS)
The battery that cuts the demand charge is also the biggest fire-code problem on the job. Get the chemistry, the interconnection, and the thermal-runaway rules right, because the fire code governs this install as much as the electrical code.
Concrete
Struck-by and caught-in hazards
Two of OSHA's Focus Four kill the most workers after falls. Keep people out of the line of fire and out of the pinch: spotters, guards, lockout, and distance from the energy.
Concrete
Drywall and gypsum board finishing
The board types and where each one goes, hanging to minimize joints, the screw pattern and depth, taping and the coats, the gypsum levels of finish 0 to 5, and the fire-rated assembly you cannot deviate from.
Concrete
Building movement joint systems
What a building movement joint is, why a building that cannot move cracks itself apart, the joint family, how to size it, and how to run it continuously through every layer and keep it dry.
HVAC
Fire and smoke restoration field guide
Beat the acidic-residue clock, dry-clean the soot before you wet it, match the chemistry to the residue, and pull the odor out at the source instead of masking it.
HVAC
Fire extinguisher classes and PASS guide
Match the extinguisher class to the fuel, decide fast whether to fight or get out, use PASS, and keep the units inspected and recharged so the one you grab actually works.
HVAC
Kitchen grease duct field guide
What the exhaust system is, why the grease is a fire hazard, how NFPA 96 governs the welded duct, the clearances, the fan, and the cleaning that keeps it from burning.
HVAC
Fire and smoke damper field guide
Put the right damper at the right rated barrier, install it exactly to the listing with the sleeve and the access door, and prove it closes on the schedule NFPA sets.
HVAC
Boiler types field guide
Sort boilers by hot water or steam, fire-tube or water-tube, cast iron, and condensing or not, then match the type to the system so a condensing boiler actually condenses.
HVAC
Hood suppression semi-annual guide
Inspect the wet-chemical system, replace the links, prove the nozzles still aim at the appliances, test actuation and the gas trip, and tag what you found.
Plumbing
Fire and smoke damage restoration field guide
Fire restoration is three problems at once. Identify the soot type because it dictates the cleaning method, dry the firefighting water first, remove the source, and clean the HVAC, or the odor comes back.
Plumbing
Sewage lift station field guide
Size the wet well to the cycle, run duplex pumps that alternate, push the force main fast enough to scour, and prove the alarm and the backup work before anyone walks away.
Plumbing
Fire sprinkler system design guide
Classify the hazard, pick the system type for the space, size the pipe by hydraulic calculation against the water supply, and detail the heads, hangers, and bracing to NFPA 13 and the AHJ.
Plumbing
Fire pump and standpipe guide
Boost the pressure the city main cannot deliver, carry it up the building to a hose valve on every floor, size the pump to its curve, zone the high-rise, and regulate the pressure that would hurt a firefighter.
Plumbing
Sump pump backup protection guide
Add the backup that keeps a basement dry when the primary pump quits, set the backup float above the primary, alarm it, and prove it runs before the storm tests it for you.
Plumbing
Sewer gas odor field guide
Find where the barrier failed: check the dry trap first, then the wax ring and the vent, then smoke test for the hidden leak, and tell sewer gas from drain biofilm.
Datacenter
Rack BBU and ride-through
Why hyperscalers put lithium battery backup units in the rack to carry the load through a power blip and bridge the seconds to the generator, what the OCP Open Rack BBU shelf is, and the fire-safety questions that come with lithium in the white space.
Datacenter
Lithium-ion thermal runaway safety
Why a lithium-ion cell fire feeds itself, how the off-gas can explode before it burns, and how early detection, separation, suppression, and explosion control keep one bad cell from taking the room.
Datacenter
Data center physical security field guide
How a data center is secured in concentric rings from the fence to the cabinet, what enforces each boundary, and why life safety and free egress override the lock every time.
Datacenter
Data center fire suppression compared
Clean agent, pre-action, wet pipe, and water mist measured against each other: what each protects, what it costs you when it fires, and how to pick for the room.
Datacenter
Battery monitoring for VRLA and lithium
Continuous per-cell voltage, internal resistance, temperature, and current that finds the weak cell before the outage does, across external VRLA monitors and the lithium BMS, with impedance trending, thermal-runaway alarms, and the capacity test monitoring complements.
Datacenter
Data center battery and storage types
The stored-energy choices behind critical power: VRLA, flooded, and lithium-ion (LFP vs NMC), plus the flywheel, supercapacitor, and BESS, and how footprint, life, cost, cooling, and fire risk drive the pick.
Roofing
Wood shake and shingle roofing
Installing a cedar shake or shingle roof so it breathes and resists fire: shakes versus shingles, grades, the fire and WUI code, spaced sheathing, interlayment, stainless fasteners, keyways, exposure, valleys, and ridges.
Roofing
Modified bitumen installation
Installing a mod-bit low-slope roof: SBS vs APP, the four application methods, torch fire watch, the plies, the seam bleed-out, the flashings, and what to document.
Landscaping
Outdoor fire feature guide
What makes a fire pit or outdoor fireplace safe: the clearances that keep fire and sparks off the house and the overhead, and, for gas, the rated burner, the rated media, and the vented enclosure.
Landscaping
Irrigation winterization and startup
Blow out the water before the freeze, protect the backflow, and bring the system back slowly in spring without breaking anything.
Landscaping
Sprinkler system design
Start at the water supply, group the plants into hydrozones, match precipitation rate on every zone, space heads head-to-head, then size the pipe and the valves to what the supply can actually give you.