DEADENING SOUND

Inangahua Times, 24 August 1931, Page 1

DEADENING SOUND

Simple, Efficient Methods Sound and sound effects can be combated, and the floors defeaned, by several me th-iPe over the joists, 2in by 3in fillets are nailed. Another layer of felt is then laid over the fillets, and lastly the flooriog is laid over the whole.

Should there be two layers of flooring, it would be advisable to interpose yet another thickness between these. It should be noted that the felt is not drawn tight overthe joists and fillets, but should be spread over the area to be defeaned quite loosely. ■ A second method of sound deadening •is to nail lin by lain battens or fillets to the sides of the joists, close to the bottom edge. On these rest the sound boarding, which should be cut with the grain at right angles to the direction of the joists. The space or cavity thus obtained, should now be filled, nearly to the top edge of the joists, with mineral mineral or slag wool (silicate cotton). The floor boards are then laid in the usual manner. In connection with this method it might be mentioned that, if desired, the layer of slag wool may be only 3in or 4in in depth. Yet another method, rather old nowadays, but still commonly used, consists of coating the deafening or sound boards, which have been laid in the manner described above, with a thin layer of plaster, then filling in the space with dry engine ashes, and covering with another coat of plaster/ When deadening floors in this manner, care should be exercised in seeing that the top layer of plaster is dear of the underside of the floor boards, so as to prevent dry rot. Still a further means of soundproofing floors is to lay heavy felt over the joists, tightly stretched and fixed in position by small fillets nailed to the sides of the joists just below the top edge. Thus an air | space is formed for the non-cooduc- | tion of sound. Strips of the same 1 felt and as wide as the joists, can be : nailed to the underside of the latter before fixing the laths.

If the extra expense is not objected to, ordinary sound or deafening boards can also be inserted to aid in eliminating undesired noise.