Tidy penetrations through timber cladding?

[Dunc]

I need to have a couple of penetrations in my timber cladding to allow ASHP pipe and electric connections. Any suggestions for a tidy way to finish these?

 

For the MVHR it's been easy as the ducts terminate with a flanged louvre grille, covering the rough cut and allowing a good squidge of sealant.

 

How to achieve a tidy finish around pipes and cables and seal the edges of the hole?

 

Better to put a single large duct in and put all the pipes and wires through this but then how to make airtight inside and water & bug proof outside?  Better to do each individually?

[SteamyTea]

11 minutes ago, Dunc said:

how to make airtight inside and water & bug proof outside

The bit in the middle, which needs to stop any vibrations from the pipework could be made with flexible foam.  The k-value of that would be similar to normal insulation.  You can get fire resistant, closed cell foams, they are usually used for furniture cushions.

As for inside and outside air and water resistance, can you fabricate some covers out of plywood.  Cut any holes 10mm bigger than the diameter and make your own 'seals' up with high modulus silicone.  You can buy silicone sheet in different thicknesses and it can be 'glued' with normal silicone sealant.

[Russell griffiths]

The cables will probably come out into the back of a rotary isolator, so you won’t see those as there’s a big box over the cable holes. 
 

the pipes will have pipe insulation over them so again the hole in the timber will have a substantial lump of insulation covering it. 
 

flow and return pipe individually 

communication cables on their own

supply gables one hole per supply to each isolater

 

the holes for the pipes should be about 75mm so the insulation goes all the way through the wall, don’t but it up to the wall or you will be heating the core of the wall up. 

Edited 4 hours ago by Russell griffiths