Plumbing Insulation
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 5
to Rev 6
in Plumbing Insulation.
---
title: Plumbing Insulation
…63 unchanged lines
- Where insulation contacts austenitic stainless steel piping, documentation of compliance with ASTM C795 (leachable-chloride limits per ASTM C871 and stress-corrosion testing per ASTM C692)
+### The Contractor shall submit the action submittals listed above for the Engineer's review and return before procurement and installation.
+
```datasheet
label: Action Submittals Required
…9 unchanged lines
default: "Pipe insulation product data (ASTM C547 / C534 / C1126) with conductivity and E84 indices"
```
−
−### The Contractor shall submit the action submittals listed above for the Engineer's review and return before procurement and installation.
### Submittals shall identify each insulation product against the service (hot water, cold water, storm, ADA) for which it is proposed.
…12 unchanged lines
### On projects with extensive exposed insulated piping or metal-jacketed runs, a sample length of each insulation type establishes the standard of workmanship before production work begins. {note}
+### For projects with extensive exposed insulated piping or metal-jacketed runs, the Contractor shall install a sample length of each insulation type — including a fitting, a hanger with its insert and shield, a butt joint, and the jacket termination — for the Engineer's review before proceeding.
+
```datasheet
label: Mockup Required
…4 unchanged lines
default: "No mockup required (limited scope)"
```
−
−### For projects with extensive exposed insulated piping or metal-jacketed runs, the Contractor shall install a sample length of each insulation type — including a fitting, a hanger with its insert and shield, a butt joint, and the jacket termination — for the Engineer's review before proceeding.
### The approved mockup establishes the standard of workmanship for the project and may remain as part of the work.
…4 unchanged lines
### Domestic hot water is typically distributed at 120°F to 140°F, and recirculation return at a few degrees below the supply. {note}
+### Insulation shall be selected and sized for the operating temperature of the service it covers.
+
```datasheet
label: Domestic Hot Water Distribution Temperature
…7 unchanged lines
default: 140
```
−
−### Insulation shall be selected and sized for the operating temperature of the service it covers.
### Domestic cold water and storm/roof-drainage water track the incoming municipal and rainwater temperature and run cold enough through much of the year to drop below the indoor dew point. {note}
### The hot water temperature determines which row of the energy-code thickness table applies, while the cold and storm services determine that a vapor retarder is mandatory. {note}
…3 unchanged lines
### The location of each insulated run governs the jacket and the protection it needs. {note}
+### The predominant installed exposure shall be specified for each insulated run, since it governs the required jacket type.
+
```datasheet
label: Predominant Installed Exposure
…71 unchanged lines
## Hot Water Thickness {toc}
−### The hot water schedule reflects ANSI/ASHRAE/IES 90.1 Table 6.8.3-1; where the jurisdiction enforces the IECC, the IECC Section C404 values apply and the more stringent governs. {note}
+### The hot water schedule reflects ANSI/ASHRAE/IES 90.1 Table 6.8.3-1; where the jurisdiction enforces the IECC, the IECC Section C404 values apply and the more stringent governs.
```datasheet
…37 unchanged lines
### Cold water and storm insulation thickness is governed by condensation control rather than the energy table. {note}
+### Cold water and storm insulation thickness shall be governed by condensation control rather than the energy table.
+### The thickness shall be sufficient to keep the outer surface above the design dew point of the surrounding space.
+### In ordinary conditioned interiors a 1/2 in. to 1 in. wall shall be provided for cold water condensation control.
+
```datasheet
label: Domestic Cold Water Insulation Thickness
…6 unchanged lines
default: "3/4 in. — standard interior condensation control"
```
+### Roof-drain bodies, sumps, and horizontal storm-drainage runs inside the building shall have not less than the International Plumbing Code minimum of 1 in. of insulation.
```datasheet
…6 unchanged lines
default: "1 in. — IPC minimum for condensation control (standard)"
```
−
−### Cold water and storm insulation thickness shall be governed by condensation control rather than the energy table.
−### The thickness shall be sufficient to keep the outer surface above the design dew point of the surrounding space.
−### In ordinary conditioned interiors a 1/2 in. to 1 in. wall shall be provided for cold water condensation control.
−### Roof-drain bodies, sumps, and horizontal storm-drainage runs inside the building shall have not less than the International Plumbing Code minimum of 1 in. of insulation.
### High-humidity spaces such as natatoriums, kitchens, and laundries shall be sized for the actual design dew point and shall receive a thicker wall accordingly.
…8 unchanged lines
### The ASJ provides the vapor retarder on cold and storm service, a clean finish, and a self-sealing longitudinal lap. {note}
+### Concealed piping and exposed piping in ordinary finished spaces shall use insulation with a factory-applied all-service jacket (ASJ) conforming to ASTM C1136.
+
```datasheet
label: Concealed and Interior Jacket
…3 unchanged lines
default: "Factory all-service jacket (ASJ) per ASTM C1136 with self-sealing lap (standard)"
```
−
−### Concealed piping and exposed piping in ordinary finished spaces shall use insulation with a factory-applied all-service jacket (ASJ) conforming to ASTM C1136.
### Where the jacket is the vapor retarder, the lap and every butt-joint strip shall be sealed continuously.
…8 unchanged lines
### Metal jacket protects the insulation from impact, abrasion, and — outdoors — from water entry and ultraviolet degradation. {note}
+### Piping in mechanical rooms, pipe galleries, and other locations exposed to mechanical damage, and all piping exposed to weather, shall receive a metal jacket (aluminum or stainless) per ASTM C921 over the insulation and its vapor retarder.
+
```datasheet
label: Metal Jacket (Mechanical Rooms, Exposed-to-Damage, Outdoor)
…5 unchanged lines
default: "Not required (no exposed-to-damage or outdoor runs)"
```
−
−### Piping in mechanical rooms, pipe galleries, and other locations exposed to mechanical damage, and all piping exposed to weather, shall receive a metal jacket (aluminum or stainless) per ASTM C921 over the insulation and its vapor retarder.
### On cold and storm service the metal jacket is the abuse layer over the vapor retarder, not the vapor retarder itself, and the vapor seal beneath it shall still be continuous.
### Outdoor metal-jacket seams shall be lapped to shed water downward and shall be sealed.
…3 unchanged lines
### Vapor-retarder continuity is the single most important requirement for condensation-control insulation. {note}
+### On all cold water and storm/roof-drainage insulation, the vapor retarder shall be continuous and unbroken over the entire system — straight runs, fittings, valves, hangers, and terminations.
+
```datasheet
label: Vapor-Retarder Continuity (Cold and Storm Service)
…3 unchanged lines
default: "Continuous, sealed vapor retarder over all pipe, fittings, valves, hangers, and terminations (standard)"
```
−
−### On all cold water and storm/roof-drainage insulation, the vapor retarder shall be continuous and unbroken over the entire system — straight runs, fittings, valves, hangers, and terminations.
### A vapor retarder that is sealed on the straight pipe but left open at a fitting, sliced at a hanger, or stopped short at a valve is not a vapor retarder — humid air drives through the gap to the cold pipe, condenses inside the insulation, saturates it, and the system sweats and corrodes from within while appearing intact from outside. {note}
…175 unchanged lines
## Insulation that has been wetted in storage shall not be installed.