Holes in Marmox board to attach bar shower valves and fixing bracket

[OldKettle]

Hi,
I am going to install a bar shower on a wall that it battened and then has Marmox board, and then shower panel.

I will be sealing the joints in the Marmox board, and the fixing screws and also sealing around the pipes where they pass through the marmox.

When I am fitting the shower valves, and also the wall fixing bracket, I need to drill and screw through the shower panel and Marmox board. I'm not going to be able to seal those hole in the same way that I seal the screws that fix the marmox to the battens.

Does that matter? Is there anything that I can do to minimise the fact that the fixings are somewhat compromising the Marmox?

Any thoughts greatly appreciated.

 

[Madrab]

Not usually a huge concern if you are talking about the screws and fittings to attach the fast fix kit, just cover with a thin layer of silicone and seal around the edge. That area doesn't tend to get a continuous soaking when showering, rather cast off from the person showering.