Hello everyone,
We are currently planning the partial finishing of the attic of our new build as a DIY project. One half will be converted into a home office, while the other half will remain a storage area. Between them is a small corridor where the space-saving staircase from the upper floor arrives.
The existing attic floor structure, from bottom to top, is: fleece wallpaper, plasterboard, roof battens, vapor barrier, roof rafters, 240mm (9.5 inches) insulation (Climowool KF2) between them, and tongue-and-groove floorboards nailed on top.
The office and corridor are now to be finished on top of the tongue-and-groove boards. The surface will be click vinyl. The question now is what kind of substructure would be appropriate. In my view, impact sound insulation is especially important here, since the thermal insulation is already sufficient with the 240mm (9.5 inches) insulation, and the entire roof is also lined with 240mm (9.5 inches) insulation. All rooms are also heated.
My site manager recommends covering the tongue-and-groove boards with Fermacell dry screed panels. His structural engineer believes the impact sound insulation benefits of the screed are not worth the cost, and that the vinyl could be laid directly on the tongue-and-groove boards. A compromise I found from my research could be OSB panels (possibly two layers installed crosswise).
What would you recommend given the existing structure and the planned use of the room (rather little movement – no children’s room or similar)?
If OSB is sufficient, how should it be installed? One or two layers directly on the tongue-and-groove, or with additional impact sound insulation of some kind? What thickness should the OSB panels be?
Also, I am wondering if, given the existing structure, an additional vapor barrier should be placed on top of the tongue-and-groove boards?
Kind regards
Ole_l
We are currently planning the partial finishing of the attic of our new build as a DIY project. One half will be converted into a home office, while the other half will remain a storage area. Between them is a small corridor where the space-saving staircase from the upper floor arrives.
The existing attic floor structure, from bottom to top, is: fleece wallpaper, plasterboard, roof battens, vapor barrier, roof rafters, 240mm (9.5 inches) insulation (Climowool KF2) between them, and tongue-and-groove floorboards nailed on top.
The office and corridor are now to be finished on top of the tongue-and-groove boards. The surface will be click vinyl. The question now is what kind of substructure would be appropriate. In my view, impact sound insulation is especially important here, since the thermal insulation is already sufficient with the 240mm (9.5 inches) insulation, and the entire roof is also lined with 240mm (9.5 inches) insulation. All rooms are also heated.
My site manager recommends covering the tongue-and-groove boards with Fermacell dry screed panels. His structural engineer believes the impact sound insulation benefits of the screed are not worth the cost, and that the vinyl could be laid directly on the tongue-and-groove boards. A compromise I found from my research could be OSB panels (possibly two layers installed crosswise).
What would you recommend given the existing structure and the planned use of the room (rather little movement – no children’s room or similar)?
If OSB is sufficient, how should it be installed? One or two layers directly on the tongue-and-groove, or with additional impact sound insulation of some kind? What thickness should the OSB panels be?
Also, I am wondering if, given the existing structure, an additional vapor barrier should be placed on top of the tongue-and-groove boards?
Kind regards
Ole_l
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