Page 39 - Architects Design and Installation Manual

Quick Facts Page | 39

● Structural calculations for various projects Structural Reports
● Assessment of Stability, wall/wind load etc. Calculations
● Provides a stable backing to the cavity

Structural calculations available online at www.surecav.co.uk

SureCav Limited have made available the structural calculations that have been produced for
various construction projects. The scope of these calculations include brick, flint and stone as
well as random stonework. Calculations have been carried out for assessments of the following:
Stability, Wall load, Wind load, Lateral load, Foundations, Wall ties and Insulation.

Download more from www.surecav.com
Example Summary

Re: Cavity Wall Spacer System Wall Visual and Analytic Assessment

…..These calculations have demonstrated that the wall system will be stable in most locations
and altitudes and assumed lateral pressure of 1.15kN/m2. In addition type 2 wall ties and
grade 3 mortar are required to satisfy this on external walls.

….. we are of the opinion that the Incorporation of this stiff however light material is likely to
have marginal increases in effective and allowable flexural characteristics due to its robust
nature.

..…queries have been raised with respect to the suitability of using this system with random
stone and whether the wall ties will pull out on uneven beds and stone thickness. This is a
genuine query when considering a random stone external skin that will be unstable and we
agree that concrete block backing would be recommended for most thin stonework. However,
the incorporation of this system applied to the back face of insulation or timber frame etc.
provides an extremely stable and vertical smooth formwork face providing a stable backing to
the cavity. As the external wall skin is constructed in short lifts any gaps can be filled tight
with mortar and rammed into the dimple moulded recess, leaving a scabbled and scarified
key at the top for the next lift and allowing the mortar to cure will ensure that a homogenous
and robust vertical slab is provided. Therefore wall ties whether embedded over stone or
mortar are embedded in this case into the same monolithic mass of masonry.
Ian Caldwell Bsc(Hons) CEng MICE MI Struct Eng. CC Engineers Ltd.