Wall penetration for heat pump wooden stud exterior wall

Hello,

are there special wall bushings for timber stud walls? I need to run cables for a heat pump through the exterior wall, a diameter of 50-60 mm would be sufficient. I am particularly interested in which sealant I can use to seal everything.

Best regards
Jens

Depending on the wall construction, you have to properly seal both sides, meaning the airtight layer inside at the vapor barrier + moisture-proofing outside (is it under ETICS, I assume?).

You can also do everything with Siga Rissan tape, but there are also prefabricated collars that, in my opinion, work better, e.g., from the company Eisedicht. They have several versions depending on what your respective substrate is and how you want to finish the penetration on the connection (especially on the outside).

It is much easier to work onto all existing waterproofing and surfaces.

Primarily it is the 2 insulated copper pipes that have to go through the wall + 1 x power cable. What matters to me is what kind of pipe I use through the wall, simply an HT pipe, and how do I seal the cavity in the pipe?

The question is why you want an additional pipe – then you simply have the problem that you have to seal both the connection point of the external pipe to the wall (but you can do this with sleeves as described above) and the interior. For the latter, ring space seals are generally used, which can also combine different cable/pipe diameters and seal properly at the same time. However, since they are almost always intended for core drills or liner pipes, you should rather use a KG2000 pipe as a feed-through in order to better withstand the pressure of the seal – there are a few manufacturers that approve this configuration.

Basically, you can also lead the 2 pipes and 1 cable out separately and seal them as already described. With wooden stud walls, this is very easy; the OSB panels can be drilled very precisely. This way you also have the advantage that you have stuffed all the space between the studs around the cable space with insulation and do not have, as with the pipe feed-through, a somewhat larger diameter where there is usually nothing inside.

The only advantage of the pipe solution that I can see spontaneously is that, in theory, you can later carry out other connections, meaning it is serviceable.