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Chimney Lining using Perlite
Expanded perlite is an ideal material for insulating chimneys as it is inorganic, does not support combustion and exhibits excellent thermal insulating properties over a wide range of temperatures. In addition, most acids do not affect it. Perlite chimney insulation may be mixed on-site, but pre-mixed material is commonly used to ensure consistent quality control. For new constructions perlite loose-fill chimney insulation may be used between the flue and the body of the chimney. Expanded Pprlite can be manufactured to weigh from 50kg/m3 (3lb/ft3) to 130kg/m3 (8lb/ft3).
Reconditioning ChimneysPumped chimney lining is often used in the repair or relining of existing chimneys. In this type of installation a rubber tube is inserted the length of the chimney to be relined. The tube is supported and sealed off in the firebox or at the base of the chimney and then is inflated to the desired diameter. Both round and elliptical tubes are available depending on the configuration of the chimney. Spacers maintain the tube in position in the chimney. Perlite chimney lining mix using grades P10 or P15 is pumped into the space between the tube and the inside of the chimney. When the mix has set for a minimum of 12 hours the tube is deflated and withdrawn and the top of the chimney is capped off with mortar. As there are many variables involved in a proper installation trained personnel should be used to prepare mixes and to reline chimneys. In all cases the procedures and mix formulations employed should meet applicable building requirements and regulations. |
New ConstructionsLightweight perlite loose-fill insulation or a lean mix of expanded perlite grade PCLG and cement may be used to insulate new masonry chimneys as they are being constructed. In this type of installation, the perlite is poured, pumped or hand placed between the flue liner and the inner wall of the existing chimney as it is being constructed. This same type of construction may be employed when ceramic, clay, pumice or metal liners are being used. In addition to providing excellent insulation, the liner used is made more rigid. Expanded perlite can also be used with other binders in the manufacture of prefabricated chimney liners. liners.
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