Page 512 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

Material requirements:
Pipe 8.2 m/m 2 @ 100 mm centres
4.5 m/m 2 @ 200 mm centres
3.3 m/m 2 @ 300 mm centres (18 mm pipe only)
Floor plate usage 1 plate/m 2 allowing for cutting
Edging insulation strip 1.1 m/m 2
Conduit pipe 2 m/circuit

Suspended timber floor
This system is designed for use under timber suspended floors. It uses
aluminium double heat spreader plates to transmit heat evenly across the
finished floor surface.

This system is suitable for any timber suspended floor with joist widths up to
450 mm. The heat plates are simply fixed to the joists using small flat-headed
nails or staples. A layer of insulation must be placed below the plates to prevent
the heat penetrating downwards.
Where the pipework must cross the joists, the joists must be drilled in
accordance with the building regulations.

Wall

Tongued and grooved floorboards

Double heat spreader plates

Insulation

Timber joists
Underfloor heating pipes
p Figure 7.70 Suspended floor underfloor heating installation

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