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As in masonry structures, the services are slotted into the masonry. Particularly with porous stone materials, great care must be taken that the airtight layer is provided by the interior plaster.
External wall structures suitable for passive houses, with an excellent U value of 0.127 W/m2K, can be achieved with single-shell masonry 49 cm thick and with a thermal conductivity λ of 0.070 W/mK plus 4 cm of insulating plaster.
Diagram of single-shell masonry wall to passive-house standard; cavities are filled with insulation materials; about 4 cm of insulating plaster is applied on the outside (source: Schulze Darup, adapted)
A video on airtight electrical installation:
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