Floor Constructions: Pug Screed

Solid or Suspended Floors

The 'Pug' system (a thin biscuit of screed) is used where a mechanical fixing is required for a timber floor finish. The Pug system can be used with solid or suspended concrete floors and occasionally in timber suspended floors.

The Pug system is installed between battens, usually set at 400m centres, allowing 200mm centres for the pipe layout design. The system requires a minimum base of 25mm dense insulation board, depending on building regulations. In some instances, a vapour barrier may be required (as specified by the relevant manufactures). Plastic cliprail is fastened to the insulation and the heating pipe fixed into it. A minimum of 25mm screed is then laid, ensuring that it penetrates fully underneath the pipe and sits level with the top of the batten. As the screed is directly beneath the covering board, the heat conductivity is good. Once the screed has been allowed to cure, the timber floor finish can be screwed into the still exposed timber battens.

The screed is for heat distribution only. It should be a fairly dry mix. Any cracking will not effect system performance.

Restricted Floor Build Up

The Pug system is ideal for constructions where floor build up is restricted. This particular system can lower overall floor constructions by 20mm in comparison to standard screed floors.

The Pug system can also be installed into timber suspended floors. Our preference is for timber boards to be fixed on battens between joists to support the system. Comfort Zone's experience indicates that pug systems installed into timber suspended first floors are very labour intensive, so a plated system is recommend instead.

Evenheat Limited, Compton Park, Wildmere Road, Banbury, Oxfordshire OX16 3JU
Telephone: 01295 277881, fax: 01295 277556, email: