ᐅ Underfloor Heating Spacing, Missing Sections, and Bathtub Installation
Created on: 23 Jun 2019 14:39
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M4rvin
Hi,
I wasn’t exactly sure which subforum to post in...
Our site manager asked us whether we want to place the bathtub directly on the screed or on the concrete slab. We hadn’t really thought about it until now, but we decided to go with the concrete floor.
Anyway, I was on site earlier and cut away the styrofoam, as the screed work is starting on Monday.
A few things caught my attention:
1) What should be the maximum spacing between the underfloor heating pipes? Some sections seem quite far apart, around 30cm (12 inches) to me.
2) Is it common to leave some areas without pipes? (Like the spot in front of the bathtub, see picture)
3) Now that I removed the styrofoam around the bathtub, there are still some pipes underneath. Don’t they cause any issues? And why is such unstable styrofoam even placed between the floor and the screed?
Thanks in advance
Marvin
I wasn’t exactly sure which subforum to post in...
Our site manager asked us whether we want to place the bathtub directly on the screed or on the concrete slab. We hadn’t really thought about it until now, but we decided to go with the concrete floor.
Anyway, I was on site earlier and cut away the styrofoam, as the screed work is starting on Monday.
A few things caught my attention:
1) What should be the maximum spacing between the underfloor heating pipes? Some sections seem quite far apart, around 30cm (12 inches) to me.
2) Is it common to leave some areas without pipes? (Like the spot in front of the bathtub, see picture)
3) Now that I removed the styrofoam around the bathtub, there are still some pipes underneath. Don’t they cause any issues? And why is such unstable styrofoam even placed between the floor and the screed?
Thanks in advance
Marvin
B
boxandroof23 Jun 2019 15:25M4rvin schrieb:
What should be the maximum spacing for underfloor heating pipes? To me, 30cm (12 inches) spacing seems quite large in some cases. This should be calculated in advance based on a room-specific heat load calculation, not estimated. In bathrooms, the layout is usually very tight, around 10cm (4 inches) or less if you plan to use low forward flow temperature. However, it depends on the specific conditions, so this statement should be seen as an example only.
Especially if you use a heat pump, it is very important to plan the bathroom heating carefully. Otherwise, due to the bathroom alone, you might have to operate the entire system at a higher forward flow temperature and lower efficiency for all rooms.
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boxandroof23 Jun 2019 16:21The spacing seems too wide to me. Have a room-by-room heating load calculation and installation plan provided. The supply temperature should be planned for a maximum of 30°C (86°F).
It will get warm enough, but the annual performance factor / electricity consumption will suffer if a room is significantly undersized. Usually, this is the bathroom because there is limited surface area available due to the bathtub/shower.
In our 15m² (160 ft²) bathroom, we have two 80m (260 ft) circuits with 7.5cm (3 inches) spacing. A circuit should not be longer than 100m (330 ft), in case you still have changes to make.
It will get warm enough, but the annual performance factor / electricity consumption will suffer if a room is significantly undersized. Usually, this is the bathroom because there is limited surface area available due to the bathtub/shower.
In our 15m² (160 ft²) bathroom, we have two 80m (260 ft) circuits with 7.5cm (3 inches) spacing. A circuit should not be longer than 100m (330 ft), in case you still have changes to make.
Overall, the installation is very neat. The door thresholds are also protected, and the material was laid into the door reveals.
What is less ideal is that some areas, especially corners, were skipped. However, this is tolerable.
The spacing also looks fine. Less than 10cm (4 inches) doesn’t make sense; for bathrooms, I would recommend 15cm (6 inches), and for other areas, 20cm (8 inches).
So, I would say you can be satisfied with the installation.
What is less ideal is that some areas, especially corners, were skipped. However, this is tolerable.
The spacing also looks fine. Less than 10cm (4 inches) doesn’t make sense; for bathrooms, I would recommend 15cm (6 inches), and for other areas, 20cm (8 inches).
So, I would say you can be satisfied with the installation.
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