As I suggested earlier, I would just rip the whole lot off and replace with 18mm exterior grade ply board and a couple of layers of roofing felt. I have spent the evening in the garages and there is no hint of condensation, with the outside temperature at 4.9 degrees. Bear in mind, I have absolutely NO heating in the garages, but do have a propane gas heater if the temperature does plummet!! This WILL create condensation, as I have experienced in the past, so I don't even bother with it and just wrap up warm when working.
I have also discovered that boarding out these concrete sectional garages on the inside with either 12mm or 18mm exterior ply board, dramatically reduces the condensation. I suppose that it's like a shed really, which helps the interior "breath" a little bit, as long as you've got some airflow.
Well, it's worked for me so far, with only 8 panels of 8 x 2 fitted internally. Thankfully, it isn't causing any problem this Winter, or indeed the last 4 Winters, but even so, I might add a bit more internal cladding when funds allow. The only thing I would install is a wood burning stove, but I am a bit too close to my neighbour's property to have a chimney stack to vent the smoke.
Best of luck,
Pete
I have also discovered that boarding out these concrete sectional garages on the inside with either 12mm or 18mm exterior ply board, dramatically reduces the condensation. I suppose that it's like a shed really, which helps the interior "breath" a little bit, as long as you've got some airflow.
Well, it's worked for me so far, with only 8 panels of 8 x 2 fitted internally. Thankfully, it isn't causing any problem this Winter, or indeed the last 4 Winters, but even so, I might add a bit more internal cladding when funds allow. The only thing I would install is a wood burning stove, but I am a bit too close to my neighbour's property to have a chimney stack to vent the smoke.
Best of luck,
Pete