---
aliases:
  - das
title: Distributed Antenna Systems (DAS) Takeoff
tags:
  - occupational/takeoff
  - status/draft
  - type/guide
up: "[[takeoff-scripts]]"
---
# Distributed Antenna Systems (DAS) Takeoff

> [!important]
> Complete [[emergency-systems-research]] before beginning takeoff.

> [!info]
> See [[emergency-communications-systems]] for information
> about Emergency Responder Radio Communication Systems (ERRCS).

> [!info] Cellular Systems
> Less common than ERRCS are "cellular DAS" systems

`COMMON ASSEMBLIES`/`FIRE ALARM & DAS SYSTEMS`/`DAS ASSEMBLIES`/...

## Backbone

### FACR to Every Elevator Shaft

1. .../`FACR TO ELEV PIT = ...`
    * **Length** = _Match Fire Alarm takeoff Length_
    * **Count** = _Match Fire Alarm takeoff Count_

### FACR to Every Staircase

1. .../`FACR TO STAIRWELL = ...`
    * **Length** = _Match Fire Alarm takeoff Length_
    * **Count** = _Match Fire Alarm takeoff Count_

### Stairwell Riser (Every 2 Floors)

1. * `Area` = "Typical - Stairwells Building Even Levels"

    .../`STAIRWELL RISER EVERY 2 FLRS = ...`
    * **Count** = Each stairwell

### FACR to Electric Room

1. .../`FACR TO 2HR-RATED RM = ...`
    * **Length** = _Match Fire Alarm Terminal Cabinet takeoff Length_

### Electric Room Riser to Every Floor

1. .../`2HR-RATED RM RISER TO EVERY FLR = ...`
    * **Count** = Each Electric Room

### Top 2H Rated Room To Roof

Weatherhead for antenna. One per building.

1. .../`TOP 2HR RATED RM TO ROOF = ...`
    * **Count** = 1
    * **Length** = Top level ceiling height to structure (minimum 15ft)

## Horizontal

> [!important]
> Usually only for cellular DAS.[^1]
> Confirm takeoff requirement with [[pdi-bid-estimating|Bid]].

[^1]: [[2026-05-05_11-53-09]]

1. .../`CORRIDORS ...`
    * **Length** = Length measured for every corridor/garage