Grades of basement

Grade of basement Usage Performance level Performance level
Relative humidity Dampness Wetness Temperature
1 (basic utility)

Car parking
Plant rooms (excluding electrical equipment)

Some leakages and damp areas tolerable. Local drainage may be required > 65% normal UK external range Visible damp patches may be acceptable Minor seepage may be acceptable

Car parks: atmospheric

Workshops: 15-29 oC

Mechanical plant rooms: 32oC max. at ceiling height

2 (better utility) Workshops and Plant rooms requiring drier environment than Grade 1 storage No water penetration but damp areas tolerable dependant on the intended use. Ventilation may be required to control condensation. 35-50% No visible damp patches, construction fabric to contain less than air dry moisture content. None acceptable

Retail Storage: 15oC max.

Electrical Plant rooms: 42oC max.

3 (habitable) Ventilated residential and commercial areas including offices, restaurants, and leisure centres etc. Dry environment. No water penetration. Additional ventilation, dehumidification or air conditioning appropriate to intended use. 40-60%
55-60% for restaurants in summer
None acceptable.
Active measures to control internal humidity may be necessary.
None acceptable

Offices: 21-25oC

Residential at 18-22oC

Leisure Centres
- Spectators: 18oC
- Squash courts: 10oC
- Changing rooms: 22oC
- Swimming pools: 24-29oC

Restaurants: 18-25oC

Kitchens: 29oC max.

4 (special) Archives, Landmark buildings, and stores requiring a controlled environment Totally dry environment. Requires ventilation, dehumidification, or air conditioning appropriate to intended use. 50% for art storage
>40% for microfilms and tapes
35% for books
Active measures to control internal humidity probably essential None acceptable

Art storage: 18-22oC

Book archives: 13-18oC

Concrete Basements

This guide covers the design and construction of reinforced concrete basements and is in accordance with the Eurocodes. The aim of this guide is to assist designers of concrete basements not exceeding depths of 10 metres. It will also prove relevant to designers of other underground structures. It brings together in one publication the salient features for the design and construction of such water-resisting structures. The guide has been written for generalist structural engineers who have a basic understanding of soil mechanics.

By selecting "Download", you will be redirected to the Concrete Centre bookshop, where your order will be fulfilled.