ᐅ Insulating Penetrations Through the Building Envelope?

Hello,

Since our shell construction (42.5cm (17 inches) Ytong blocks without external thermal insulation composite system) is complete and the interior work has started progressing, I have a few questions to be well prepared for the tradespeople.

I am wondering whether and how any additional insulation needs to be applied afterwards when holes are drilled through the exterior walls, thus penetrating the main insulation layer.

Examples:
The electrician drilled several holes from the kitchen area through the wall into the garage to run cables.

The plumber drilled a hole through the wall for the water connection to the garage and installed piping.

For the electric shutters, one hole per shutter was drilled through the insulation layer (polystyrene in front of the ring beam) to the outside, and a small slit was cut with a knife to allow the cable from the shutter box to be routed inside.

My question is whether these holes should simply be sealed with plaster, or if expanding foam or other insulating materials should be used to compensate for the insulation that was broken.

For the controlled mechanical ventilation system, two insulated ducts lead to the exterior.

Thank you very much in advance for your help.

Regards,
Kai

Hello

Which insulation are you talking about?

My question is how to insulate the holes through which cables and pipes pass from the house, for example into the garage, or the electrical cables from the roller shutter box that were fed from the outside to the inside.

There is Ytong filler mortar available for repairs. That should work well. They might also have a suitable foam product. But in general, yes, every slot and hole in monolithic masonry is a significant thermal bridge.

A house is not a bicycle inner tube that can be punctured with any thumbtack. Sometimes I get the idea to imagine heat loss as if it were tiny microscopic creatures. Insulation is no exception to the fact that you can overdo everything. You won’t freeze to death just because a cable passes through a wall.

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