Due to high humidity in our home (65-70%) I have been advised by a damp expert that i need to have the old cavity wall insulation removed. This would be really expensive and I’m reading conflicting advice online that this would be highly unnecessary.

I live in a 1930s semi and no major signs of damp other than occassional mildew on furniture and the kitchen/diner laminate floor keeps expanding and planks ‘crowning’. The people who fitted the floor have cut it down a few times and now have said its due to the humidity which we need to sort or it will damage the floor.

I’ve had a dehumidifier on constant and the lowest it goes is 55%. We have no obvious leaks or blocked vents (though I noticed the ones upstairs in the bedrooms have fibre glass in). We have open vents on most windows and I’ve been opening windows to let air circulate.

Can anyone offer any advice as to whether removing the cavity wall insulation is a wise move as I’m worried it will cause more harm than good and really expensive. The other option is a Positive Input Ventilation unit, but the damp expert said this would just mask the problem. Any advice greatly received!