unfinished.one

unfinished.one

The open reference library for built assets: how long building components last and how to maintain them. Every answer carries its source, a confidence grade and a permanent link, for people writing capital plans and for the agents helping them.

It is never finished. Gaps are published, not hidden, so the people who can fill them know where to start.

Coverage

Version 1 covers the 100 building components municipalities and facility teams own most often. Each square is one component.

written, coloured by confidence gradenot written yet
HVAC 1/30
Controls 0/10
Plumbing 0/12
Electrical 0/14
Fire protection 0/8
Envelope 0/12
Conveying 0/4
Arenas and pools 0/10

HVAC · 1 of 30 written

ComponentUniformatMedian lifeGrade
Rooftop unit, gas heat / DX coolingD305015 yearsD
Rooftop heat pump unitD3050—planned
Make-up air unitD3040—planned
Air handling unit, indoorD3040—planned
Energy or heat recovery ventilatorD3040—planned
Boiler, hot water, condensingD3020—planned
Boiler, hot water, non-condensingD3020—planned
Boiler, steamD3020—planned
Furnace, gas-firedD3020—planned
Chiller, air-cooledD3030—planned
Chiller, water-cooledD3030—planned
Cooling towerD3030—planned
Condensing unit, split systemD3030—planned
Fan coil unitD3050—planned
Unit heater, gas-firedD3050—planned
Unit heater, hydronicD3050—planned
Infrared heater, gas-firedD3050—planned
Ductless mini-split heat pumpD3050—planned
Water-source heat pumpD3050—planned
VAV terminal unitD3040—planned
Exhaust fanD3040—planned
Supply or return fanD3040—planned
Pump, inline circulatorD3040—planned
Pump, base-mounted end suctionD3040—planned
Variable frequency driveD3040—planned
Expansion tankD3040—planned
Plate heat exchangerD3040—planned
Hydronic baseboard radiationD3050—planned
Humidifier, steamD3040—planned
Computer room air conditionerD3050—planned

Controls · 0 of 10 written

ComponentUniformatMedian lifeGrade
Building automation supervisory controllerD3060—planned
Unitary or field DDC controllerD3060—planned
ThermostatD3060—planned
Temperature sensorD3060—planned
CO2 sensorD3060—planned
Pressure or flow sensorD3060—planned
Damper actuatorD3060—planned
Control valve with actuatorD3060—planned
Motorized damperD3060—planned
Gas detection systemD3060—planned

Plumbing · 0 of 12 written

ComponentUniformatMedian lifeGrade
Water heater, gas, storage tankD2020—planned
Water heater, electric, storage tankD2020—planned
Water heater, tankless gasD2020—planned
Backflow preventerD2020—planned
Domestic hot water recirculation pumpD2020—planned
Domestic water booster pumpD2020—planned
Sump pumpD2040—planned
Sewage ejector pumpD2030—planned
Water closetD2010—planned
Lavatory and faucetD2010—planned
UrinalD2010—planned
Drinking fountain or bottle fillerD2010—planned

Electrical · 0 of 14 written

ComponentUniformatMedian lifeGrade
Switchgear, low voltageD5010—planned
PanelboardD5010—planned
Transformer, dry-typeD5010—planned
Transformer, pad-mounted liquid-filledD5010—planned
Motor control centreD5010—planned
Automatic transfer switchD5090—planned
Generator, diesel standbyD5090—planned
Generator, natural gas standbyD5090—planned
Uninterruptible power supplyD5090—planned
Interior lighting, LEDD5020—planned
Interior lighting, fluorescentD5020—planned
Exterior and site lighting, LEDD5020—planned
Emergency lighting unitD5090—planned
Exit signD5090—planned

Fire protection · 0 of 8 written

ComponentUniformatMedian lifeGrade
Sprinkler system, wet pipeD4010—planned
Sprinkler system, dry pipeD4010—planned
Fire pumpD4010—planned
Fire alarm control panelD5030—planned
Smoke and heat detectorsD5030—planned
Portable fire extinguisherD4030—planned
Kitchen hood fire suppressionD4090—planned
Standpipe and hose systemD4020—planned

Envelope · 0 of 12 written

ComponentUniformatMedian lifeGrade
Roof, modified bitumenB3010—planned
Roof, built-upB3010—planned
Roof, EPDM single-plyB3010—planned
Roof, TPO or PVC single-plyB3010—planned
Roof, metal standing seamB3010—planned
Roof, asphalt shinglesB3010—planned
Window, aluminum frameB2020—planned
Window, vinyl frameB2020—planned
Curtain wall glazingB2020—planned
Exterior door, hollow metalB2030—planned
Overhead door, sectionalB2030—planned
Automatic entrance doorB2030—planned

Conveying · 0 of 4 written

ComponentUniformatMedian lifeGrade
Elevator, hydraulicD1010—planned
Elevator, tractionD1010—planned
Vertical platform liftD1010—planned
EscalatorD1020—planned

Arenas and pools · 0 of 10 written

ComponentUniformatMedian lifeGrade
Ice plant compressorD3030—planned
Ice plant brine chillerD3030—planned
Brine pumpD3040—planned
Evaporative condenserD3030—planned
Arena dehumidifierD3090—planned
Ice resurfacerE1090—planned
Pool filter, sandF1040—planned
Pool circulation pumpF1040—planned
Pool chemical controllerF1040—planned
Natatorium dehumidification unitD3090—planned

Confidence grades

A
Observed data. Observed replacements, sample of 50 or more.
B
Sources agree. Three or more independent published sources agree within 20%.
C
Published source. One or two published sources.
D
Expert estimate. Estimate by named editors only.

Most early entries are C or D. What the grades mean · Use it from an agent · All entries as JSON