BS 5618:1985

Foreword
Committees responsible
Code of practice
1. Scope
2. Definitions
3. Suitability of cavity walls for insulation
4. Material composition
5. Thermal performance of installed foam
6. The filling process
7. Installation of the UF foam system
8. Post-installation activities
9. Records
10. Declaration
Appendices
A. Criteria for suitability of external cavity walls
B. Natural stones used in the construction of
     masonry walls
C. Calculation of the exposure index E of a building
     (tabular method)
D. Calculation of the exposure index E (formula
     method)
E. Driving-rain index
F. Comparison of methods for assessing exposure to
     wind-driven rain
G. Formaldehyde
H. Flue checks for appliances of rated input not
     exceeding 60 kW
J. Properties of the installed (UF) foam
K. Methods for determination of cavity width
Tables
1. Quality checks on site during or prior to
     installation
2. Geographic factor G
3. Topographic factor T
4. Terrain roughness factor R
5. Topographic factor S
6. Equations for Bc
7. Comparisons between exposure values in DD 93 and
     in this code
Figures
1. Staggered drilling pattern (representing maximum
     spacing)
2. Drilling and filling patterns at damp proof course
     and party lines
3. Unit area plan
4. Overall pattern of filling for a nominal 50 mm
     width cavity
4a. Types of rubble walling
5. Maximum height of external cavity wall
6. Effective height of a partially protected cavity
     wall
7. Height of location for buildings on or close to
     steeply rising ground
8. Relationship between the exposure index used in
     this code and the maximum directional spell index
     in DD 93
9. Measurement of cavity width
10. Estimation of cavity width
Maps
Key to driving-rain index maps 1 to 30
1-30 Driving-rain index
31 Annual mean driving-rain index 'roses'

This edition updates the selection procedure for suitable properties and significantly tightens the requirements for the installation procedure.

This British Standard code of practice describes recommendations for the installation of urea-formaldehyde (UF) foam systems which are dispensed on site, to fill the cavities of suitably situated and constructed external walls of maximum height 12 m, which have masonry or concrete inner and outer leaves, thereby providing additional thermal insulation to such walls. It defines what are suitably situated and constructed external walls and indicates essential procedures and precautions for the filling process. Walls built of random rubble are not covered by this code.

NOTE The titles of the publications referred to in this code are listed on the inside back cover.