Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Mass Timber
…89 unchanged lines
max: 1.8
step: 0.1
−setpoints: [1.5]
+setpoints: [1.5, 1.8]
default: 1.5
```
…24 unchanged lines
- Erection drawings and sequence
- Adhesive product data with exposure category
−default: [Product data (products, layups, grades), Shop drawings (layout, marks, connections, penetrations), Connection calculations and connector cut sheets, Fire-resistance design calculations]
+default:
+ - "Product data (products, layups, grades)"
+ - "Shop drawings (layout, marks, connections, penetrations)"
+ - "Connection calculations and connector cut sheets"
+ - "Fire-resistance design calculations"
```
…92 unchanged lines
max: 19
step: 1
−setpoints: [16, 19]
+setpoints: [12, 16, 19]
default: 16
```
…71 unchanged lines
max: 12.375
step: 0.125
−setpoints: [4.125, 6.875, 9.625]
+setpoints: [3.125, 4.125, 6.875, 9.625, 12.375]
default: 6.875
```
…155 unchanged lines
max: 14
step: 1
−setpoints: [8, 10, 12]
+setpoints: [6, 8, 10, 12, 14]
default: 10
```
…32 unchanged lines
## Sound Transmission and Floor Vibration
−### Bare mass timber floors transmit airborne and impact sound readily and often fail the vibration frequency thresholds expected of office and residential occupancies; a resilient mat and concrete topping are the usual remedy and must be specified deliberately, not "optional." A floor-ceiling assembly built up with a resilient underlayment mat and a concrete topping over the timber deck raises both STC and IIC ratings and damps floor vibration. {note}
+### Bare mass timber floors transmit airborne and impact sound readily and often fail the vibration frequency thresholds expected of office and residential occupancies; a resilient mat and concrete topping are the usual remedy and must be specified deliberately, not "optional." A floor-ceiling assembly built up with a resilient underlayment mat and a concrete topping over the timber deck raises both STC and IIC ratings and damps floor vibration.
### The floor-ceiling assembly shall achieve the minimum Sound Transmission Class designated below, verified by ASTM E90 testing and ASTM E413 classification.
…6 unchanged lines
max: 65
step: 1
−setpoints: [50, 55, 60]
+setpoints: [45, 50, 55, 60, 65]
default: 50
```
…8 unchanged lines
max: 65
step: 1
−setpoints: [50, 55, 60]
+setpoints: [45, 50, 55, 60, 65]
default: 50
```
…10 unchanged lines
max: 1.0
step: 0.125
−setpoints: [0.4, 0.5, 0.75]
+setpoints: [0.25, 0.4, 0.5, 0.75, 1]
default: 0.5
```
…43 unchanged lines
## Floor Perimeter Firestopping
−### At each floor line, the joint between the mass timber floor and the exterior wall or facade must be firestopped to maintain the floor's fire rating and to resist vertical fire spread up the building perimeter; this is frequently missed in early curtainwall coordination. {note}
+### At each floor line, the joint between the mass timber floor and the exterior wall or facade must be firestopped to maintain the floor's fire rating and to resist vertical fire spread up the building perimeter; this is frequently missed in early curtainwall coordination.
### Perimeter joints between the mass timber floor edge and the exterior wall shall be firestopped with a tested perimeter fire-barrier system complying with ASTM E2307 and IBC Section 715.
…24 unchanged lines
max: 0.25
step: 0.0625
−setpoints: [0.125]
+setpoints: [0.0625, 0.125, 0.25]
default: 0.125
```
…101 unchanged lines
### Touch-up finish material matching the exposed mass timber finish shall be delivered to the Owner in a quantity sufficient for minor field repairs.