ᐅ Attic conversion, subfloor construction for underfloor heating
Created on: 20 May 2018 12:41
A
alexvdbHello everyone,
I want to convert the attic in my former parental home, which was built in 1962. The existing structure has a wooden beam ceiling that is 20cm (8 inches) thick, with about 50-60% of the volume between the beams filled with a lime-straw mixture. On top of that, there are tongue-and-groove boards of varying widths that are very loosely fixed, meaning they are nailed with very few nails.
Now, a complete conversion of the attic is planned, including a brand-new roof. Since a completely new heating system will also be installed, we have decided to use underfloor heating throughout the entire floor. The attic will include a full living unit consisting of a kitchen, dining room, living room, bedroom, and bathroom.
My question is how I should design the floor structure. A carpenter friend recommended leaving the lime-straw layer in place and refixing the boards above with Spax screws. Then install the underfloor heating system on top (1cm (0.4 inches) insulation, clip-in panels for pipe installation, 5-6cm (2-2.5 inches) wet screed, followed by the floor covering).
What do you think? Should I consider anything else? I’m concerned about the lack of impact sound insulation, which is currently very poor. Would new boards or other panels improve this? Should the lime layer possibly be removed and replaced with mineral wool or something similar?
I look forward to any constructive input or ideas.
Thanks in advance and have a nice Sunday 🙂
Best regards, Alex
I want to convert the attic in my former parental home, which was built in 1962. The existing structure has a wooden beam ceiling that is 20cm (8 inches) thick, with about 50-60% of the volume between the beams filled with a lime-straw mixture. On top of that, there are tongue-and-groove boards of varying widths that are very loosely fixed, meaning they are nailed with very few nails.
Now, a complete conversion of the attic is planned, including a brand-new roof. Since a completely new heating system will also be installed, we have decided to use underfloor heating throughout the entire floor. The attic will include a full living unit consisting of a kitchen, dining room, living room, bedroom, and bathroom.
My question is how I should design the floor structure. A carpenter friend recommended leaving the lime-straw layer in place and refixing the boards above with Spax screws. Then install the underfloor heating system on top (1cm (0.4 inches) insulation, clip-in panels for pipe installation, 5-6cm (2-2.5 inches) wet screed, followed by the floor covering).
What do you think? Should I consider anything else? I’m concerned about the lack of impact sound insulation, which is currently very poor. Would new boards or other panels improve this? Should the lime layer possibly be removed and replaced with mineral wool or something similar?
I look forward to any constructive input or ideas.
Thanks in advance and have a nice Sunday 🙂
Best regards, Alex
Hello,
during the renovation of an old house (also with a wooden beam ceiling), I installed 25mm (1 inch) OSB boards, followed by 5cm (2 inches) impact sound insulation, and then a thin-layer screed with underfloor heating because a standard screed was not possible for structural reasons. Impact sound is not an issue.
during the renovation of an old house (also with a wooden beam ceiling), I installed 25mm (1 inch) OSB boards, followed by 5cm (2 inches) impact sound insulation, and then a thin-layer screed with underfloor heating because a standard screed was not possible for structural reasons. Impact sound is not an issue.
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