ᐅ Insulation / Vapor Retarder for Top Floor Ceiling / Collar Beams, Open Ceiling
Created on: 23 Nov 2012 12:13
K
Karsten 244
Hello, our house (built in the 1960s) is planned to get a new roof with insulation all the way up to the ridge in the next few years. But today, we need to replace the floorboards in the attic (the sloping roof sections are lightly insulated and clad with wood), and here the question arises whether a vapor retarder should be installed. 180mm (7 inches) mineral wool will be placed between the collar beams. The current ceiling construction from below is: wallpaper, plaster, straw, collar beams. From above, the ceiling is open. Since a new vapor retarder cannot be sealed airtight at the bottom to the old sloping roof, I’m unsure what purpose the vapor retarder would serve in this case. I would appreciate any tips and opinions. Looking forward to your input. Best regards, Karsten
C
cweiller3310 Jan 2013 12:22Hello everyone,
I hope someone can help me. We have bought a newly built semi-detached house and now need to insulate the top floor ceiling (wooden beams 20 cm (8 inches)).
Unfortunately, I am a complete beginner, so my question is: how should the setup be?
From below, drywall panels and in the bathroom the green Fermacell panels—so far so good—but what about from above? The attic is not to be insulated and should only be accessible for the chimney sweep. In my opinion, I would now squeeze 20 cm (8 inches) of glass wool insulation between the beams, then put a vapor barrier foil over the beams, and then install boards on top for walking on... is this the correct procedure, and is the insulation sufficient? Please help! Thanks in advance.
I hope someone can help me. We have bought a newly built semi-detached house and now need to insulate the top floor ceiling (wooden beams 20 cm (8 inches)).
Unfortunately, I am a complete beginner, so my question is: how should the setup be?
From below, drywall panels and in the bathroom the green Fermacell panels—so far so good—but what about from above? The attic is not to be insulated and should only be accessible for the chimney sweep. In my opinion, I would now squeeze 20 cm (8 inches) of glass wool insulation between the beams, then put a vapor barrier foil over the beams, and then install boards on top for walking on... is this the correct procedure, and is the insulation sufficient? Please help! Thanks in advance.
C
cweiller3310 Jan 2013 15:23OK, so from below: vapor barrier foil on the joists, then drywall panels on top... and from the attic floor: just the insulation wool between the joists down to the vapor barrier foil, and then boards on top, finished? Sorry if I misunderstood anything... is 20 cm (8 inches) of insulation enough? And what about the attic staircase? Do I need to consider anything there, and can I just use a well-insulated one like the Wellhöfer model?
To be honest, get a professional. This is such a critical area in a cold roof, especially when a staircase still needs to be installed—it’s best for amateurs to stay away.
We have a KfW55 loft ladder installed and are glad that someone else is responsible for the warranty to ensure nothing goes wrong.
We have a KfW55 loft ladder installed and are glad that someone else is responsible for the warranty to ensure nothing goes wrong.
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