Evans' and Swain's System (Fig. 253) consists of timber joists spiked close together without any spaces between. The depth of the joists varies from 4½ inches for 8 feet spans to 11 inches for 30 feet spans. The spikes are about 18 inches apart, holes being bored for them to prevent splitting.
1 Cunnington, Building News, 15th March 1889.
All cracks or shrinkages in the upper surface of the floor are filled up with a grouting of liquid plaster, while the plaster ceiling may be attached, as shown, to the under surface of the joists, alternate joists being less deep, so as to form a key, or it may be attached to laths upon fillets.
The advantages of this floor are, that it is simple, and composed entirely of timber in large scantlings and plaster, both of which offer a very considerable resistance to fire.