Thermafleece is an ideal choice for helping minimise heat loss through suspended floors. Fit the insulation between the joists ensuring all joints are close-butted to avoid air gaps. Overlap additional layers to reduce thermal bridging and air gaps. Pay particular attention to the perimeter of the floor, filling every gap with insulation.
Support insulation with netting to the underside of the joist. An airtight breather membrane can be fitted to the underside of the joist to minimise air movement through the floor. Breather membranes are windproof so reducing the chill factor, are dustproof so keeping the insulation clean, and permeable so the system can still breathe and the timbers have access to moisture to maintain moisture content levels.
If the flooring comprises open floorboards, you could install an airtight breather membrane on the top side of the Thermafleece to avoid a build-up of dust and debris on top of the insulation and to reduce any movement.
Maintain a ventilated space at least 150mm below the level of the insulation. Ensure that all air vents under the floor are unobstructed and take care not to block ventilation air path.
Our Help and Advice section has Application Notes with diagrams available to download