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steve171716 Mar 2014 17:33Hello,
I plan to convert and insulate my attic. The following approach is intended: There will be two rooms in the attic plus a shower bathroom. The walls will be built using drywall construction. The knee walls will also be shortened to create more usable space. The top floor ceiling will be covered with drywall. On the collar beams, tongue-and-groove wooden boards (16mm (5/8 inches) thick) will be installed so the attic space can be used as a walkable storage area for small items. The attic height at the ridge is approximately 1.30m (4 ft 3 in). The attic is unheated. The ceiling to the attic will also be insulated. Additionally, all roof sides including the attic will have insulation between the rafters. A vapor retarder or vapor barrier will then be installed over everything. Afterward, all surfaces will be covered with drywall.
My questions:
- Is a vapor retarder sufficient for the regular rooms? I was thinking of using the Isover Climate Membrane Vario KM duplex.
- Do I need a separate vapor barrier in the bathroom? Should all walls and the ceiling in the bathroom be covered with a vapor barrier?
- Does the attic hatch require special consideration regarding the ceiling insulation, especially the vapor retarder?
- For the attic, should I use a vapor retarder with a lower Sd value? Or would it be better not to insulate the attic at all?
The house was built in the 1950s and is currently uninsulated. On the rafters, there is a paper-based underlay (roofing felt). The rafter depth is approximately 12cm (5 inches).
Thank you very much. I look forward to your advice and tips.
I plan to convert and insulate my attic. The following approach is intended: There will be two rooms in the attic plus a shower bathroom. The walls will be built using drywall construction. The knee walls will also be shortened to create more usable space. The top floor ceiling will be covered with drywall. On the collar beams, tongue-and-groove wooden boards (16mm (5/8 inches) thick) will be installed so the attic space can be used as a walkable storage area for small items. The attic height at the ridge is approximately 1.30m (4 ft 3 in). The attic is unheated. The ceiling to the attic will also be insulated. Additionally, all roof sides including the attic will have insulation between the rafters. A vapor retarder or vapor barrier will then be installed over everything. Afterward, all surfaces will be covered with drywall.
My questions:
- Is a vapor retarder sufficient for the regular rooms? I was thinking of using the Isover Climate Membrane Vario KM duplex.
- Do I need a separate vapor barrier in the bathroom? Should all walls and the ceiling in the bathroom be covered with a vapor barrier?
- Does the attic hatch require special consideration regarding the ceiling insulation, especially the vapor retarder?
- For the attic, should I use a vapor retarder with a lower Sd value? Or would it be better not to insulate the attic at all?
The house was built in the 1950s and is currently uninsulated. On the rafters, there is a paper-based underlay (roofing felt). The rafter depth is approximately 12cm (5 inches).
Thank you very much. I look forward to your advice and tips.
Hello,
On the room side, a continuous vapor barrier or vapor retarder is always required, depending on the use! For the attic, it depends on how it is used. If it is used as living space, it should be treated the same way as the other rooms in the top floor. Otherwise, you can avoid excessive insulation measures (proportional roof and gable areas). In that case, the underroof space should be largely vapor permeable (top layer), and the roof space should be passively ventilated through or behind the insulation whenever possible!
Best regards.
steve1717 schrieb:
......
On the room side, a continuous vapor barrier or vapor retarder is always required, depending on the use! For the attic, it depends on how it is used. If it is used as living space, it should be treated the same way as the other rooms in the top floor. Otherwise, you can avoid excessive insulation measures (proportional roof and gable areas). In that case, the underroof space should be largely vapor permeable (top layer), and the roof space should be passively ventilated through or behind the insulation whenever possible!
Best regards.
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