Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Self-Adhering Sheet Waterproofing
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### EPDM-based and other elastomeric sheets are used where extreme low-temperature flexibility or specific chemical exposure governs. {note}
+### The membrane chemistry shall be specified, selected for the temperature exposure and chemical resistance the installation is subject to.
+
```datasheet
label: Membrane chemistry
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```
−## Total membrane thickness is selected from hydrostatic head, traffic or topping load on horizontal work, and substrate roughness. The 80% case for a below-grade vertical wall is 60 mil; 40 mil is the floor for protected vertical work, and 80 mil is reserved for heavy-traffic deck and split-slab service. {note}
+## Total membrane thickness is selected from hydrostatic head, traffic or topping load on horizontal work, and substrate roughness. The usual thickness for a below-grade vertical wall is 60 mil; 40 mil is the floor for protected vertical work, and 80 mil is reserved for heavy-traffic deck and split-slab service. {note}
+## The total membrane thickness shall be specified, sized to the hydrostatic head, traffic or topping load, and substrate condition of the installation.
+
```datasheet
label: Total membrane thickness
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```
−## Physical-property minimums shall be met by the supplied membrane and verified against the manufacturer's published data. {note}
+## Physical-property minimums shall be met by the supplied membrane and verified against the manufacturer's published data.
```datasheet
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## Voids, honeycomb, tie holes, and surface irregularities greater than the manufacturer's tolerance shall be filled and made flush before membrane application.
−## Rough or open-textured masonry, including coarse CMU, shall receive a parge coat or a primer-fill before the membrane, so the membrane adheres to a continuous surface rather than bridging the mortar joints and block texture. Without this step the membrane spans the irregularities and water tracks behind it at the surface profile. {note}
+## Rough or open-textured masonry, including coarse CMU, shall receive a parge coat or a primer-fill before the membrane, so the membrane adheres to a continuous surface rather than bridging the mortar joints and block texture. Without this step the membrane spans the irregularities and water tracks behind it at the surface profile.
## A primer compatible with the membrane shall be applied to concrete and masonry substrates wherever the manufacturer requires one, which for self-adhering bituminous products on those substrates is nearly always.
−### Most adhesion failures and field RFIs on self-adhering work trace to an omitted or wrong primer; the membrane line item must always carry its matching primer rather than treating priming as optional. {note}
+### Most adhesion failures and field RFIs on self-adhering work trace to an omitted or wrong primer; the membrane line item must always carry its matching primer rather than treating priming as optional.
### The primer shall be allowed to dry to the manufacturer's tack condition before the membrane is applied — typically 30 to 60 minutes at 70°F (21°C) — and the membrane shall be installed within the primer's stated open time, generally not more than 1 to 4 hours, before dust or contamination compromises the bond.
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### End laps shall be a minimum of 6 in. (150 mm).
−### T-joints, where an end lap meets a side lap, shall be dressed with the manufacturer's detail mastic, because three layers of release-edge geometry are the most leak-prone point in any self-adhering field. {note}
+### T-joints, where an end lap meets a side lap, shall be dressed with the manufacturer's detail mastic, because three layers of release-edge geometry are the most leak-prone point in any self-adhering field.
```datasheet
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## The membrane shall terminate above final grade at a reglet or with a termination bar and shall be sealed with the manufacturer's termination sealant.
−### The final finish-grade elevation shall be confirmed before the membrane is terminated; a termination set below finish grade is buried, loses its mechanical and sealant closure, and admits water at the top of the system. {note}
+### The final finish-grade elevation shall be confirmed before the membrane is terminated; a termination set below finish grade is buried, loses its mechanical and sealant closure, and admits water at the top of the system.
### The membrane termination height is established on the drawings relative to confirmed finish grade. [[drawing: wall section, membrane termination height]]
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## Spare materials shall be from the same manufacturer and product line as the installed work and shall be delivered in original unopened packaging with current shelf life.