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Chemical Injection Treatments |
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The Building Code of Australia, to which all new construction must comply, requires damp-proof courses, (dpcs), to be placed
through the full thickness of the base of walls below floor level to form an impervious layer that keeps rising
dampness out of the interior of the structure. (SAA Masonry Code, AS3700.)
Should access to the wall under the floor prove impractical for the installation of a chemical
injection treatment dampcourse then the floor timbers,
including bearers and joists, should be isolated from the damp masonry with heavy duty plastic membranes. (Also applies to physical
membrane installation if installed above a suspended timber floor).
Replastering is always recommended when installing a remedial chemical
injection treatment, or physical dpc. The hygroscopic salt content will always be
prone to extreme vapour contamination and should be replaced with a sand and cement base coat containing salt and water retardant
additives. |
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Old style damp-coursing fluids are either installed using high pressure injection pumps or by gravity feeding reservoir fed plastic
tubes.
The introduction of thixotropic silane/siloxane cream emulsions, such as the Lectros D.P.C.Cream, have vastly improved installation successes
and helped to maintain installation costs.
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Lectros DPC Cream can be used in all types of masonry without the use of
high pressure equipment. The cream is delivered by hand pressure only, from a simple displacement pump with an injector lance into a
series of holes drilled into the mortar course. From here it migrates rapidly into the damp masonry pores where the injection cream
reverts to a liquid phase and polysiloxanes are formed in-situ. During the curing period a low molecular-weight silane vapour is also
produced giving excellent migration through the wall.
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 "Dampcourse Diagram")
