ᐅ Fireplace Kit - New Construction - Load-Bearing Insulation
Created on: 19 Jul 2017 09:12
S
seol_1984
Hello everyone,
In our new build, we would like to address the topic of a fireplace, and we would appreciate your opinions and experiences.
The following situation applies:
Thank you for your support.
Best regards,
Sebastian
In our new build, we would like to address the topic of a fireplace, and we would appreciate your opinions and experiences.
The following situation applies:
- LAS chimney system from the company Erlus, TYPE SL 18 (11 m total length, 18 cm (7 inches) diameter).
- Location: living room, open kitchen, approximately 50 sqm (540 sq ft) in total, open staircase, extending up to the 2nd floor.
- Plan: airtight fireplace insert, for example Camina S9, weighing approximately 500 kg (1,100 lbs).
- KfW-40 standard, triple glazing, mechanical ventilation without heat recovery, operated by a fan in the attic.
- At the spot where the fireplace will be installed, a recess in the screed will be made. However, unlike usual practice, it will not be filled with bonded screed. According to the architect, this is because it would create a thermal bridge and therefore bonded screed cannot be used. Instead, Styrodur (extruded polystyrene) will be used as a load-bearing insulation. The architect’s statement is “up to about 1000 kg (2,200 lbs) this is not a problem.” What are your experiences? What do you think? What should we pay attention to?
- Regarding the “air pressure monitor”: presumably only the local chimney sweep or authorized inspector can tell us if this is required, correct?
- Is it possible to tile over the expansion joints between the "normal" screed and the recessed screed? Could we choose a large screed recess and, if necessary, tile over it in case the fireplace footprint ends up being significantly smaller?
- What else should we consider when reading about this plan?
Thank you for your support.
Best regards,
Sebastian
1.1 tons equals how many square meters? Usually, there is something under the screed with about 100 kPa (approximately 100 kg per square decimeter). With an even, distributed load, this can work with a 1-ton stove, but if the weight is only applied at a single point, the risk of settling is very high. My buffer tank of about 1 ton rests on a steel ring, which definitely would not have worked.
S
seol_198420 Jul 2017 08:13Great, thank you very much for all the responses. I’ll try to summarize again:
1) Weight topic: For a kit weighing about 500 kg (1100 lbs), you should have no issues with Styrodur insulation and the corresponding screed.
2) Air pressure monitor topic: This needs to be clarified with the local chimney sweep / inspector. All elements that exchange air, such as extractor hoods, must be taken into account.
3) Expansion joint topic: This should not be tiled over, but integrated into the tiling pattern, so the expansion joint remains visible within the tile layout. If this is the exact kit, the manufacturer’s recommended size for the screed recess should also be used. I still don’t understand why one shouldn’t use a buffer zone (of 10 cm or 20 cm (4 or 8 inches)) if it is covered by the visual components of the fireplace?
4) Output (7 kW) topic: The fireplace will be oversized for our house, so it will heat up very quickly. The fireplace should not be operated at 50% capacity but always fully, to avoid shiny soot and tar deposits. It is possible, just hot; perhaps balance this by using an open stairwell and open first and second floors.
Is that understood correctly?
Best regards,
Sebastian
1) Weight topic: For a kit weighing about 500 kg (1100 lbs), you should have no issues with Styrodur insulation and the corresponding screed.
2) Air pressure monitor topic: This needs to be clarified with the local chimney sweep / inspector. All elements that exchange air, such as extractor hoods, must be taken into account.
3) Expansion joint topic: This should not be tiled over, but integrated into the tiling pattern, so the expansion joint remains visible within the tile layout. If this is the exact kit, the manufacturer’s recommended size for the screed recess should also be used. I still don’t understand why one shouldn’t use a buffer zone (of 10 cm or 20 cm (4 or 8 inches)) if it is covered by the visual components of the fireplace?
4) Output (7 kW) topic: The fireplace will be oversized for our house, so it will heat up very quickly. The fireplace should not be operated at 50% capacity but always fully, to avoid shiny soot and tar deposits. It is possible, just hot; perhaps balance this by using an open stairwell and open first and second floors.
Is that understood correctly?
Best regards,
Sebastian
H
Hausbauer128 Aug 2017 14:44Domski schrieb:
I already pushed 16 kW into the water with my 14 kW (11 water, 4 air/stone).What kind of stove is that? And how do you manage to push 16 kW into the water when it’s rated at 14 kW?
Hausbauer1 schrieb:
What kind of fireplace is that? And how do you manage to push 16 kW into the water when the rating is 14 kW?Schmid Lina W
14 kW (47,700 BTU/h) is the standard nominal output. The 16 kW (54,600 BTU/h) was measured using a heat meter at the return flow boost. I haven’t verified how accurate these output figures are or what tolerances apply at the moment the measurement was taken. Under normal operation, I have between 6 and 8 kW (20,500 to 27,300 BTU/h) water output.
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