English

This report is one of a series giving practical advice on methods of reducing radon levels in existing dwellings. It is intended to help surveyors, builders and householders who are trying to reduce indoor radon levels by positive pressurisation. The report is based on a large body of remedial work carried out to advice from the Building Research Establishment (BRE), and on discussions with others working in the field. The measures it describes are applicable, in principle, to all dwellings and similar buildings.

This report is one of a series giving practical advice on methods of reducing radon levels in existing dwellings. It is intended for the guidance of householders and builders who seek to reduce radon levels in dwellings by sealing cracks and other discontinuities in solid ground floors. The remedial measures described are mainly for concrete floors laid directly on the ground but some of the principles could be used with suspended concrete floors and, to a lesser extent, with floors consisting of large stone slabs.

This report gives guidance for reducing the presence of radon in new dwellings, and hence reducing the risk to occupants of exposure to radon. Interim guidance was first issued by the Department of the Environment in June 19881. Since that time much experience has been gained of its application in practice. This report has been prepared to build on the experience gained and to provide a more comprehensive explanation of the principles involved. It provides practical details on methods of protecting new dwellings

This report is one of a series giving practical advice on methods of reducing radon levels in existing dwellings. It deals specifically with dwellings, and supplements the general guidance given in The householders' guide to radon 1, obtainable from local environmental health officers or from the Department of the Environment. This report offers advice on radon-protective measures that can be taken during the planning and implementation of major alteration or conversion works to a building in radon-affected areas.

This report is one of a series giving practical advice on how to reduce indoor radon levels in existing dwellings. Its specific subject is radon remedial measures for houses with suspended timber floors. These measures can also be used with other types of suspended floor, although they are not relevant to timber finishes laid directly onto concrete bases. The report is aimed at builders who carry out radon remedial work and householders who are competent at D IY.

A new version of the ASHRAE's Standard 62, which concentrates on ventilation and indoor air quality 
issues, has recently been released for pubIic review. What elements have.changed from the 1989 edition?

This Bulletin on preventing dampness in houses covers some aspects that builders and subtrades may occasionally
be required to deal with . It is, however, also intended for general guidance to householders.

Designing for grille and diffuser noise is of paramount importance. Neil Jarman looks at the data currently provided by manufacturers and provides some design tips.