BRE GG28/1 PDF

Introduction

This Good Building Guide describes the types of ground floors commonly used in domestic properties: ground-supported concrete slab floors, suspended concrete floors (including beam and block) and suspended timber floors. It provides information on how to construct each type of floor and gives advice on the positioning of damp-proof membranes (DPMs) and thermal insulation. In particular, it gives details of:

• damp proofing
• vapour-control layers
• drying times for concrete bases and screeds
• positions for thermal insulation.

This guide does not deal with:

• structural requirements
• specific values or thicknesses of thermal insulation (because they depend on individual designs)
• requirements for the exclusion of radon and methane^[5]
• heated screeds.

The reader is advised to consult a chartered surveyor, structural engineer or similarly qualified person if any of the above requirements are specified.