Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Roof Hatches and Smoke Vents
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## Equipment, materials, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
−## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing. {note}
+## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
| Standard | Title |
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## Manufacturer Qualifications {toc}
−### Units shall be the standard catalog product of a manufacturer regularly engaged in the production of factory-fabricated roof hatches and smoke vents. {note}
+### Units shall be the standard catalog product of a manufacturer regularly engaged in the production of factory-fabricated roof hatches and smoke vents.
### Each unit shall be factory cycle-tested for proper operation of the cover, hold-open hardware, and latching before shipment.
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```
−### Spring-assisted covers on exposed roofs can act as a sail and be damaged by wind uplift when held open; cover opening direction shall be coordinated with building orientation and prevailing wind. {note}
+### Spring-assisted covers on exposed roofs can act as a sail and be damaged by wind uplift when held open; cover opening direction shall be coordinated with building orientation and prevailing wind.
### The cover opening direction shall be oriented so the open cover does not face the prevailing wind on exposed rooftops.
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## Energy and Air Barrier Compliance {toc}
−### A factory-insulated cover with an R-value below the surrounding roof assembly creates an energy-code deficiency that is commonly missed at permit; cover insulation shall meet or exceed the adjacent roof assembly minimum. {note}
+### A factory-insulated cover with an R-value below the surrounding roof assembly creates an energy-code deficiency that is commonly missed at permit; cover insulation shall meet or exceed the adjacent roof assembly minimum.
### Cover and curb insulation R-value shall equal or exceed the minimum required for the surrounding roof assembly under ASHRAE 90.1 for the project climate zone.
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### Equipment hatches require an opening sized for the largest item passed; openings above roughly 48 in. × 96 in. are custom-fabricated. {note}
+### Where the equipment hatch clear opening exceeds the manufacturer's largest standard catalog size, the unit shall be custom-fabricated to the dimensions indicated. [[drawing: equipment hatch opening dimensions]]
+
```datasheet
label: Equipment Hatch Clear Opening
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```
−### Where the equipment hatch clear opening exceeds the manufacturer's largest standard catalog size, the unit shall be custom-fabricated to the dimensions indicated. [[drawing: equipment hatch opening dimensions]]
−
## Cover and Curb Material {toc}
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```
−### Insulation shall be a non-wicking type — rigid polyisocyanurate or encapsulated fiberglass — protected by a metal liner on the cover interior. {note}
+### Insulation shall be a non-wicking type — rigid polyisocyanurate or encapsulated fiberglass — protected by a metal liner on the cover interior.
### The cover insulation shall be enclosed by a metal liner pan and shall not be left exposed on the cover underside.
# Hardware {toc}
−## Roof hatch hardware shall permit one-person operation from inside and provide positive holding of the open cover against incidental wind. {note}
+## Roof hatch hardware shall permit one-person operation from inside and provide positive holding of the open cover against incidental wind.
## Hold-Open Hardware {toc}
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```
−### The hold-open arm shall include a release handle that allows the cover to be closed in a controlled manner without freefall. {note}
+### The hold-open arm shall include a release handle that allows the cover to be closed in a controlled manner without freefall.
### The hold-open mechanism shall require a deliberate manual release to disengage and shall not release under wind load alone.
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## Weatherproofing {toc}
−### The cover shall close against a continuous compressible gasket to seal the cover-to-curb joint against wind-driven rain. {note}
+### The cover shall close against a continuous compressible gasket to seal the cover-to-curb joint against wind-driven rain.
### The cover-to-curb joint shall be gasketed with a continuous closed-cell or EPDM gasket.
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### The prescriptive IBC 910 vent-to-floor-area ratio is 1:100 for storage height 12 ft or less and 1:75 for storage height greater than 12 ft; an engineered NFPA 204 design may establish a different ratio. {note}
+### The vent-to-floor-area ratio basis shall be specified, using the IBC 910 prescriptive ratio for the applicable storage height or an NFPA 204 engineered design.
+
```datasheet
label: Vent-to-Floor-Area Ratio Basis
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# Finishes {toc}
−## The exposed finish shall be selected for durability in the roof environment and for coordination with the building's architectural treatment. {note}
+## The exposed finish shall be selected for durability in the roof environment and for coordination with the building's architectural treatment.
## Cover Finish {toc}
−### Galvanized and stainless covers may be furnished mill-finished; aluminum covers requiring a coordinated color shall receive a factory organic coating. {note}
+### Galvanized and stainless covers may be furnished mill-finished; aluminum covers requiring a coordinated color shall receive a factory organic coating.
### The cover shall be finished as scheduled.
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```
−### A safety post or self-closing guardrail gate at the ladder shall be provided to protect the open hatch opening. {note}
+### A safety post or self-closing guardrail gate at the ladder shall be provided to protect the open hatch opening.
### A telescoping safety post or guardrail at the hatch opening shall be provided where the hatch serves a fixed ladder.
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## Protection and Adjustment {toc}
−### Installed units shall be protected from construction traffic and debris until substantial completion. {note}
+### Installed units shall be protected from construction traffic and debris until substantial completion.
### Smoke and heat vents shall not be used as construction access or material hoisting points.
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# Delivery, Storage, and Handling {toc}
−## Units shall be delivered factory-assembled in protective packaging with listing labels and operating instructions attached. {note}
+## Units shall be delivered factory-assembled in protective packaging with listing labels and operating instructions attached.
### Units shall be stored off the ground, covered, and protected from weather and physical damage until installation.
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### The warranty shall cover hardware operation, including hold-open arms, springs, latches, and smoke-vent release mechanisms.
−### Warranty service for smoke and heat vents shall include restoration of the listed automatic operation following any covered failure. {note}
+### Warranty service for smoke and heat vents shall include restoration of the listed automatic operation following any covered failure.
# Spare Parts {toc}
−## The Contractor shall furnish spare operating components to support post-occupancy maintenance of the installed units. {note}
+## The Contractor shall furnish spare operating components to support post-occupancy maintenance of the installed units.
### The Contractor shall furnish spare fusible links for not less than 10 percent of the installed smoke and heat vents, and not fewer than two of each rating used.
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- Spare latch assemblies
```