ᐅ Challenges for MEP planners: underfloor heating flow temperature and wastewater ventilation
Created on: 15 Jul 2022 10:22
P
Pacmansh
Hello,
we are at the beginning of the construction phase for our development project with the builder, and I am having some disagreements with the MEP planner. To be better prepared for the discussion, I would appreciate your assessment.
Point 1) Supply temperature of underfloor heating, new building, KfW55 standard, air-to-water heat pump
The supply temperature of the underfloor heating (end-terrace house on both floors) was stated to me as 40°C (104°F) after inquiry. This seems absurdly high to me. Additionally, I was informed that the surface temperature is designed to a maximum of 27°C (81°F) due to the flooring materials. Somehow, this does not seem consistent. When I asked about lowering the supply temperature, the response was: "A general reduction is not feasible with the underfloor heating without reducing the pipe spacing to an unacceptable level."
Do you have any ideas how I can respond to this in a reasonably professional way? Are there any documents or sources I could refer to, or information I should request?
Point 2) Wastewater venting
Contrary to earlier agreements, this has been planned in a rather unfavorable location. The reason given is "because the wastewater vent and the residential ventilation (exhaust air) must be routed over the roof with a certain separation according to flat roof guidelines." What distance should be maintained here? A quick online search only showed a 30cm (12 inches) distance to other building components. Basically, this is about the roof penetrations and their distance from each other, correct?
we are at the beginning of the construction phase for our development project with the builder, and I am having some disagreements with the MEP planner. To be better prepared for the discussion, I would appreciate your assessment.
Point 1) Supply temperature of underfloor heating, new building, KfW55 standard, air-to-water heat pump
The supply temperature of the underfloor heating (end-terrace house on both floors) was stated to me as 40°C (104°F) after inquiry. This seems absurdly high to me. Additionally, I was informed that the surface temperature is designed to a maximum of 27°C (81°F) due to the flooring materials. Somehow, this does not seem consistent. When I asked about lowering the supply temperature, the response was: "A general reduction is not feasible with the underfloor heating without reducing the pipe spacing to an unacceptable level."
Do you have any ideas how I can respond to this in a reasonably professional way? Are there any documents or sources I could refer to, or information I should request?
Point 2) Wastewater venting
Contrary to earlier agreements, this has been planned in a rather unfavorable location. The reason given is "because the wastewater vent and the residential ventilation (exhaust air) must be routed over the roof with a certain separation according to flat roof guidelines." What distance should be maintained here? A quick online search only showed a 30cm (12 inches) distance to other building components. Basically, this is about the roof penetrations and their distance from each other, correct?
@ "Pacmansh"
I believe that when a child has fallen into the well, it is basically pointless to focus on assigning blame.
In this case, tiles with the appropriate build height were planned by the contracting company, but now a thinner covering is to be used.
From what I can see, there are absolutely NO issues here!
The screed surface will undergo a cleaning grind, the dust will be vacuumed, the entire area primed with a dispersion, and then a suitable leveling compound will be applied in the required thickness.
DONE!
Whether the 8mm (0.3 inches) height difference is made up by a ceramic tile or a mineral leveling compound is practically irrelevant for both thermal transmission and thermal resistance.
It does not have a negative impact!
--------------------------------
Wishing you success: KlaRa
I believe that when a child has fallen into the well, it is basically pointless to focus on assigning blame.
In this case, tiles with the appropriate build height were planned by the contracting company, but now a thinner covering is to be used.
From what I can see, there are absolutely NO issues here!
The screed surface will undergo a cleaning grind, the dust will be vacuumed, the entire area primed with a dispersion, and then a suitable leveling compound will be applied in the required thickness.
DONE!
Whether the 8mm (0.3 inches) height difference is made up by a ceramic tile or a mineral leveling compound is practically irrelevant for both thermal transmission and thermal resistance.
It does not have a negative impact!
--------------------------------
Wishing you success: KlaRa
Pacmansh schrieb:
The question of who is responsible only arises regarding the additional costs, but I currently estimate that there should be no problems. Now I am waiting for the site manager’s response. Well, first of all, you have to consider that the total area is relatively small, and that laying ceramic tiles would have involved extra work with material costs as well.
This means that in a (here purely hypothetical) legal dispute, there are certain fixed costs anyway, which would reduce the potentially disputed amount.
My advice: the expenses for legal proceedings would probably be disproportionate!
There are – especially in construction – situations where the client can only grind their teeth in frustration.
They are right, but enforcing that right is usually (or often) tedious given the time and effort required.
However, of course, such a decision is yours to make!
-----------------
Regards, KlaRa
Reggert schrieb:
8mm (0.3 inches) is the thickness some people need just to get the screed level in the first place, so it’s nothing unusual.
Check the perimeter insulation strips, then apply the screed mass and you’re done. I believe readers in this forum will be able to properly assess such a statement!
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