Insulating semi-detached house floor from below Information, help, tips and advice on cavity walls, ceilings and lofts etc....

[zakoro]

Hello, I have looking to insulate the ground floor of my semi-detached house, where I have a basement with sufficient room to crawl under.

I was looking at the possibility of adding insulation from below, as I do not want to rip up the floorboards, however I run into the issue of not being able to install a VCL properly then.

I was also planning on laying 9mm ply/OSB over the current floorboards prior to install luxury vinyl planks, to ensure flat surface throughout. Could it be an option to install a VCL between the floorboards and ply? What other options do I have?

[stoneyboy]

Hi zakoro,
Suggest you use fibreglass quilt or mats slightly thicker than joist depth and hold this in place using strong cord zigzagged over the bottom of the joists. No vcl needed.
Regards S