ᐅ Attic conversion floor new construction OSB/gypsum fiber/impact sound insulation
Created on: 3 Nov 2022 13:08
L
lehbot82Hello everyone,
I’ve been reading up on this topic a bit.
Currently, the floor is constructed as follows:
- Chipboard 18mm (0.7 inches)
- Painter’s fleece 1 mm (0.04 inches)
- Carpet 4 mm (0.16 inches)
- Chipboard 16 mm (0.63 inches)
- Carpet 7 mm (0.28 inches)
Built in 1990, and the first layer of chipboard is as old as the building. The floor creaks intensely.
I once placed two gypsum fiber boards by Knauf on top, but the creaking continued. So from my point of view, everything can be removed.
Between the joists there is compressed felt insulation and no void floor for loose fill or similar.
Joist structure. The lines represent the joists.
The stains on the joists are plaster or mortar or something similar.
The total floor area is about 16 sqm, rounded up to 17 sqm. The 12.67 sqm is the official living space.
So overall, the area is quite moderate.
My ideas are now:
Option 1:
Knauf Gyfafloor 25 mm (1 inch)
Impact sound insulation
Cork or laminate flooring
Option 2: (My favorite):
OSB 3 board 25 mm (1 inch) (According to the chart, 22 mm (0.87 inches) would also be suitable for this joist spacing, but I prefer to be safe.)
Impact sound insulation
Cork or laminate flooring
Option 2 is my preference because OSB is much cheaper and lighter.
Does anyone have other ideas?
What options are there for proper impact sound insulation? It can be a bit thicker. I still have 21 mm (0.8 inches) of space to reach the previous build-up height.
A heavy loose fill would probably be the most optimal, right? Are there alternatives that can be compressed or placed between the joists? I would prefer not to install a void floor.
The OSB boards would be installed on these bearing insulation strips for decoupling, right?
And then the OSB board laid perpendicular to the joists, so one board spans multiple joists, correct? I often read that boards are more load-resistant when installed lengthwise rather than across, but this is usually stated without context. Without further explanation, this information isn’t very helpful.
Do the OSB boards have to be screwed directly to the joists? I’ve read a lot that they can also be installed as floating floors. I would actually prefer this, since joists naturally move a lot, and this would decouple the boards from the joists.
Yesterday I also read a bit about floorboards (solid wood planks) that could be used as an alternative. But then I completely miss impact sound insulation, or are there good ideas for that?
Below the attic floor is mainly a bathroom and a hallway.
I appreciate any constructive response, even if it only addresses part of the topic.
So far I’m surprised how complex this issue is.
Best regards,
Marcus
I’ve been reading up on this topic a bit.
Currently, the floor is constructed as follows:
- Chipboard 18mm (0.7 inches)
- Painter’s fleece 1 mm (0.04 inches)
- Carpet 4 mm (0.16 inches)
- Chipboard 16 mm (0.63 inches)
- Carpet 7 mm (0.28 inches)
Built in 1990, and the first layer of chipboard is as old as the building. The floor creaks intensely.
I once placed two gypsum fiber boards by Knauf on top, but the creaking continued. So from my point of view, everything can be removed.
Between the joists there is compressed felt insulation and no void floor for loose fill or similar.
Joist structure. The lines represent the joists.
The stains on the joists are plaster or mortar or something similar.
The total floor area is about 16 sqm, rounded up to 17 sqm. The 12.67 sqm is the official living space.
So overall, the area is quite moderate.
My ideas are now:
Option 1:
Knauf Gyfafloor 25 mm (1 inch)
Impact sound insulation
Cork or laminate flooring
Option 2: (My favorite):
OSB 3 board 25 mm (1 inch) (According to the chart, 22 mm (0.87 inches) would also be suitable for this joist spacing, but I prefer to be safe.)
Impact sound insulation
Cork or laminate flooring
Option 2 is my preference because OSB is much cheaper and lighter.
Does anyone have other ideas?
What options are there for proper impact sound insulation? It can be a bit thicker. I still have 21 mm (0.8 inches) of space to reach the previous build-up height.
A heavy loose fill would probably be the most optimal, right? Are there alternatives that can be compressed or placed between the joists? I would prefer not to install a void floor.
The OSB boards would be installed on these bearing insulation strips for decoupling, right?
And then the OSB board laid perpendicular to the joists, so one board spans multiple joists, correct? I often read that boards are more load-resistant when installed lengthwise rather than across, but this is usually stated without context. Without further explanation, this information isn’t very helpful.
Do the OSB boards have to be screwed directly to the joists? I’ve read a lot that they can also be installed as floating floors. I would actually prefer this, since joists naturally move a lot, and this would decouple the boards from the joists.
Yesterday I also read a bit about floorboards (solid wood planks) that could be used as an alternative. But then I completely miss impact sound insulation, or are there good ideas for that?
Below the attic floor is mainly a bathroom and a hallway.
I appreciate any constructive response, even if it only addresses part of the topic.
So far I’m surprised how complex this issue is.
Best regards,
Marcus
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