Pipes into stud walls

[Stu-B]

Planning is the key. Plastic comes in much much longer lengths than copper so the need to joint is much less, and is much more flexible to route through stud walls if you need to drill noggins and upright timbers.

 

[SimonG]

Copper.

 

[Best]

I only use copper.
Anywhere you drill through noggins etc, be sure to wrap something around the pipe to prevent creaks when pipes are heating and cooling.

 

[Welder]

Copper. Less air ingress = less corrosion.