This is a span to deflection ratio of 872. Although there are
no current Standards for pre-fabricated post-tensioned stone
panels BS 8298 part three [1] suggests a limit of span/360,
for stone faced pre-cast concrete. On this basis the deflection
due to wind is therefore well within allowable limits. On the
other hand a similar beam using Stoke Hall would deflect
20.4 mm, span to deflection ratio of 147 and may therefore
need to be constructed using thicker stones in order to reduce