ᐅ Spontaneous Adjustments to Underfloor Heating Design

A certified inspector in the heating circuit manifold on the upper floor – you don’t see that very often these days.

Is the screed provided by the client?

20°C (68°F) in the study is also too low; if you’re sitting there working on the computer, you’ll feel cold.

Tolentino schrieb:

Talk to the subcontractor.

I’ve thought about that too, but:

matte1987 schrieb:

But in the living room, for example, I think the spacing is because with such small spacing they would exceed the maximum heating circuit length of 120 m (394 feet), meaning they would need two circuits.

I don’t want to cause more damage than benefit with blind (especially uninformed) actionism.
That’s why I’m asking what would still make sense now.

T_im_Norden schrieb:

The question for you now is, how much time do you have?

Fairly short. They’re arriving next Monday.

T_im_Norden schrieb:

I assume the underfloor heating is designed for a supply temperature of 35 degrees Celsius (95°F).

Could be, if it’s a standard setup.

T_im_Norden schrieb:

Actually, somewhere in your specifications or contract there should be something about the system design.

To be honest, I’ve never read anything except “DIN.”

T_im_Norden schrieb:

I just saw the insulation values on the plans, do you also have insulation under the slab?

Yes, with an unheated basement, the slab is insulated.
KfW55 standard, 148 sqm (1593 sq ft) living area.

tomtom79 schrieb:

A bypass valve in the heating circuit distributor on the upper floor—that’s something you rarely see these days.

Bypass valve? Is that a problem? I’m going to close it anyway.

tomtom79 schrieb:

Screed supplied by the builder?

That surprised me too 😉
Probably just means it’s done by a different company. The underfloor heating installers also offer screed services.

Given the short time available, I don't see much possibility to make significant changes.
Does the subcontractor install the complete underfloor heating system including the manifold and supply lines, or only the heating loops up to the manifold?

T_im_Norden schrieb:

I don’t see much opportunity to make significant changes given the short time available.
Does the subcontractor install the entire underfloor heating system including the manifold and supply lines, or just the heating loops up to the manifold?

The manifold is already installed and was connected today, if I saw correctly.

So, underfloor heating beneath the bathtub – worth trying, counterproductive, or no longer salvageable?

One could try to adjust the loops in rooms 1 and 2.
For example, set the living room loop to about 85 meters (280 feet) and then combine the dining area and part of the living room into one loop of about 85 meters (280 feet).
This would make the loop lengths more balanced.
If possible, I would have it installed under the bathtub.

Summary:

A maximum installation spacing of 10 cm will most likely fail due to the time factor before execution. But it doesn’t hurt to ask; it might still be possible with a few extra days of delay and the corresponding additional costs.

The supply line for the heating circuit distributors should be at least 28 mm (1.1 inches) copper pipe and not 20 mm (0.8 inches) or 25 mm (1 inch) polyethylene or aluminum composite pipe nonsense, but this is already installed, so nothing can be done about it anymore.

If the supply lines of the heating circuits are often routed through the corridor, and the corridor has its own circuit, have the supply lines of the other rooms insulated. Otherwise, no matter how much you turn down the room thermostat of the corridor circuit, the room will still be heated by the uninsulated supply lines of the other heating circuits. //I just noticed the corridor is being heated by the supply lines of the other rooms, so the topic of insulation is irrelevant in this case...