We have read the letter that appeared in The Structural Engineer, Vol. 5 0 , No. 1, January 1972, p. 28, with some surprise and not a little interest. Since this Company
originated the idea and production of permanent woodwool formwork units in 1959, something like 2 x 106 yd2 of Spanform formers have been installed in the UK and
overseas, and this criticism, to our knowledge, is the first of its kind.