Static structures (e.g. – buildings) – Processes – Protection
Patent
1996-08-05
1999-01-19
Friedman, Carl D.
Static structures (e.g., buildings)
Processes
Protection
43124, 43131, 431321, E04B 100
Patent
active
058602666
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The present invention relates to the preventative protection of buildings against termites.
At present, the protection of buildings against the penetration of harmful isoptera (termites) is generally effected by pouring, spraying or injecting insecticide products in doses which should prove to be sufficient to ensure protection for a number of years. A ban on the use of certain insecticides, which are effective but which cause substantial toxic and ecotoxic pollution, has resulted in the use of substances which are less dangerous but which are less stable chemically, so that it is necessary for the operations to be repeated at more frequent intervals, which gives rise to difficult problems owing to the dispersal of undesirable materials into the environment.
Moreover, these preventative and curative renewal treatments are, by definition, carried out after the construction of tho building and, therefore, it is necessary to drill through the walls, floors, etc, which involves heavy and expensive work, causing inconvenience and the complete effectiveness of which is difficult to assure, since it is not always possible to drill the recommended number of holes. Furthermore, after construction, certain locations prove to be inaccessible to preventative and/or curative treatments of this type.
Finally, in an endeavour to increase the effectiveness of the preventative and/or curative treatments, there may be a considerable temptation to overdose the product, particularly around inaccessible locations, with the obvious dangers of pollution, which were precisely those which it was desired to avoid.
If it is recalled that it only requires one or more unprotected ways of penetration, which are very few in number, to allow the termites to invade a building and cause the well-known damage thereto, it is possible to judge the gravity of the problem and the necessarily serious deficiencies of the preventative and/or curative renewal treatments, even if they have been properly carried out, since the "chemical barrier" is rarely continuous.
DESCRIPTION OF THE INVENTION
The present invention aims to obviate these drawbacks and relates to a method for the protection of buildings against termites, which method is put into effect during the construction of the buildings themselves, and which is characterised in that said protection is permanent and complete, even though it makes use of new generation termicides, this combination of properties hitherto being considered to be impossible.
In fact, it was known how to obtain complete and permanent protection prior to construction but only by pouring, etc., substances which are now prohibited.
It was also known to use less powerful substances, however, this depended on the use of preventative and/or curative renewal treatments (therefore, the method was not "permanent") and gave rise to the very considerable danger of allowing the presence Of unprotected penetration paths (therefore, the method was not "complete").
However, the invention proposes a method and means combining four essential properties, the simultaneous combination of which was previously considered to be impossible: unprotected paths). curative treatments in the event of failure).
Various plastic materials are also known for the controlled release of active ingredients. In particular, the document FR-A-3 491 037 (ROUSSEL-UCLAF) discloses packing and coating materials with insecticide properties and comprising a film of plastic material (polyethylene, for example) which is impregnated throughout by beans of a compound of the pyrethrin type.
The document JP 59-62503 discloses a kraft paper sheet impregnated with termicide and coated on one of its two sides with a plastic film. The product is supposed to diffuse through the polyethylene. It is a strong composite product intended for "under floor" use, i.e. in precise areas. Moreover, it involves old technology (1982), i.e. at a time when powerful termicides were authorised, even at high doses, parameters which are now strictly controlled.
U.S. Pat.
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Lieux Olivier
Marcotte Guy
Martinet Pascal
Aubrey Beth
Cecil S.A.
Friedman Carl D.
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