Tel  01509 812020

·

All under floor concrete slabs and screeds must be dried to 2% moisture content. This will take approximately 1 month for every 25mm thickness of slab. Concrete sub floors must be clean, dry and flat and a self-levelling compound should be used to correct any unevenness, again ensuring that it is completely dry. Readings should be taken and recorded with a Protimeter Moisture Measuring instrument or similar.

·	All existing flooring, plywood, flooring grade chipboard or MDF sub floors must be in good structural condition, level and free from rot and fungus. New timber joists, battens and supporting timber should be kiln dried to 15% and under.

·	Ambient conditions should be with in the range of 15°c to 27° and relative humidity in the room should be maintained at 40 - 60%

·	All Wood Flooring should be stickered out to acclimatise in the room where it is to be laid, in normal living conditions, for at least 2 weeks prior to installation.

·	Solid hardwood floors should be glued, using an MS Polymer flexible adhesive such as Rewmar, and then nailed onto an 18mm Plywood or flooring grade Chipboard sub-floor.

·	Expansion gaps of 15mm should be left around the perimeter of the floor. These can be covered by skirting. For spans over 6m wide, 2mm washer gaps must be left at 1m intervals across the entire floor.

·

Solid hardwood floors should be glued, using an MS Polymer flexible adhesive such as Rewmar, and then nailed onto an 18mm Plywood or flooring grade Chipboard sub-floor. We also recommend that engineered timber flooring is laid in exactly the same way. The additional floor height will not effect the performance.

·	Floors fully bonded to the sub-floor will conduct heat better than floors floated over an underlay and will require a lower running temperature.

·	Heating systems must be commissioned prior to the floor being installed by slowly turning the heating up 1 degree per day until it runs on the highest setting and then down over a 7 day period turning the system off.

·	Floor thermostats must be installed.

·	The heating system must be regulated to ensure a maximum effect of 60W/m2 and the maximum running temperature at the sub-floor surface must not exceed 27°c under any circumstances.

·	Rooms with poor U values will need greater levels of heat through the floor than well insulated rooms. You need to seek advice in this instance to check that a screed temperature of 27°c will provide enough heat to keep the room warm.

·	Pre-seals must NOT be used on screeds over under floor heating.

·	Hot water systems create a smoother flow of heat than electric systems that are prone to hot Spots

·	Do not lay rugs or carpets of any description on top of timber over under floor heating as these create hotspots.