The Logic of the Assembly
Mass-timber panels want to stay visible and dry — which puts the entire control-layer package on the outside. This system documents the exterior stack: airtight membrane directly on the panel, insulation outboard, WRB, and a ventilated cladding zone, with panel joints and floor junctions taped as the erection sequence allows, not after.
Moisture management during construction is as important as the finished assembly. This is general documentation; project engineering belongs with your design professional of record.
Layers & Components
Panel-Face Membrane
Airtight membrane applied directly to the timber, joints taped during erection.
Exterior Insulation
The full thermal layer rides outside the structure, keeping the timber warm and dry.
Weather Layer
WRB and ventilated cavity — the timber never sees bulk water.
Construction-Phase Protection
Temporary moisture protection for panels between erection and enclosure.
Working in Mass Timber?
The desk will help sequence the membrane package with your erection schedule.
Ask the Spec Desk