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All plumbing work becomes accessible to all thanks to multilayer pipes. There are two distribution systems: System D gives its tips.

Recessed installation, called hydrocable

Multilayer pipe: two distribution systems: pipe

This installation principle consists in distributing flush-mounted sanitary appliances in one room from collectors connected to the general supply: one for hot water and the other for cold water. It is the system that requires the fewest fittings, but the largest linear of tubes.
Multilayer pipes that distribute sanitary water must imperatively be laid in sheath to be embedded in the drywall, plasterboard, brick plasterer, or embedded in the slab. Only exception: honeycomb panels.
On the other hand, the tubes distributing the heating water at more than 60° C are always placed in sheath to allow them to expand without damage.

The pose in apparent

Multilayer pipe: two distribution systems: pipe

UV insensitive, the multilayer pipe can also arise in appearance like copper.
The bars must be fixed more than 15 cm from the ground. At changes of direction, you can either bend the tube, cut it and fit a fitting. But, beware, too many connections can create a loss of pressure in the tube and a decrease in pressure at the point of drawing.
As for the clamps, they must hold the tubes in place while allowing their expansion.
Some rules must be respected: place a collar on each side of each fitting and with changes of direction (connections or bending), and leave less than 1 m between the collars for the most common tubes (16 x 2 and 20 x 2).

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