ALLERGY TO BUILDING AND DECORATING MATERIALS/WHAT TO USE: DAMP-PROOFING TREATMENTS
Injection damp-proof courses work by injecting chemicals into the fabric of the building above ground level to form a chemical barrier which deters the passage or rise of damp. Many building societies will not now grant a mortgage on a building without such a course.
The main ingredient of the damp-proofing liquid is silicone, which does not cause sensitivity. This is held, however, in an organic solvent and with a catalyst which continues to work throughout the life of the building. Damp-proofing firms can provide a solvent with a catalyst which contains acetic acid (vinegar) and acetate of glycerol, which are much less aggressive than other chemicals. Ask for these if you are installing or replacing a damp proof course.
Bitumen is often used as a solid damp-proofing layer when new floors are laid, or as part of a sealing layer in brick walls or masonry. The fumes from this can cause sensitivity when it is being laid, but once dry and aired, it does not give off persistent fumes and does not cause problems in this use.
Plastic sheeting is often laid under floors or as a sealing layer between courses of bricks or masonry. The plastic sheeting usually airs off fast, and is also well sealed by flooring or plaster. It does not therefore cause sensitivity.
Other damp-proof treatments are barrier chemical treatments, which involve placing a sealed plastic or rubbery membrane between the damp site, usually a wall or floor, and the inner surface. These are best avoided, because isocyanates, which are known to cause symptoms on use, are used in liquid rubber preparations.
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