The presentation of this seventh edition continues the familiar and unique
format of clear illustrations supplemented with comprehensive notes throughout.
The benefit of data accumulated from the numerous previous editions, permits
traditional construction techniques to be retained alongside contemporary and
developing practice.
Established procedures are purposely retained with regard
to maintenance and refurbishment of existing building stock.
Progressive development, new initiatives and government directives to reduce
fuel energy consumption in buildings by incorporating sustainable and energy
efficient features is included.
In support of these environmental issues, the
companion volume Building Services Handbook should be consulted for applications
to energy consuming systems, their design and incorporation within the
structure.
The diverse nature of modern construction practice, techniques and developments
with new and synthetic materials cannot be contained in this volume
alone.
The content is therefore intended as representative and not prescriptive.
Further reading of specific topics is encouraged, especially through professional
journals, trade and manufacturers’ literature, illustrative guides to the Building
Regulations and the supplementary references given hereinafter.
Power Float † a hand-operated electric motor or petrol engine,
surmounted over a mechanical surface skimmer. Machines are
provided with an interchangeable revolving disc and a set of
blades. These are used in combination to produce a smooth, dense
and level surface finish to in-situ concrete beds.
The advantages offset against the cost of plant hire are:
* Eliminates the time and materials needed to apply a finishing
screed.
*
A quicker process and less labour-intensive than hand troweling.
Application † after transverse tamping, the concrete is left to
partially set for a few hours.
Amount of setting time will depend
on a number of variables, including air temperature and humidity,
mix specification and machine weight.
As a rough guide, walking on
the concrete will leave indentations of about 3†4 mm.
A surfacing
disc is used initially to remove high tamping lines, before two
passes with blades to finish and polish the surface.
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