Damp-proof courses

Lead is relatively easily corroded where acetic acid fumes are present and under such conditions it either should not be used or should be efficiently protected. Generally, any contact between lead and organic material containing or developing acids will cause corrosion for instance, unseasoned wood may be detrimental. Trouble from this cause may be prevented by using well-seasoned timber, by maintaining dry conditions, or by separating the lead from the timber by bitumen felt or paint. Lead is also subject to attack by lime and particularly by Portland cement, mortar and concrete, but can be protected by a heavy coat of bitumen. A lead damp-proof course laid without protection in the mortar joint of a brick wall may become severely corroded, especially where the brickwork is in an exposed condition and is excessively damp. 

Careful sealing of the floor-to-wall joints and of the ground floor walls was unsuccessful in reducing pressure-driven flow of radon from the subsoil. This merely diverted the flow of radon up through the internal walls of the dwelling and into upstairs rooms. The problem arose in this old dwelling because it has very porous walls and no damp proof course, thus allowing radon to by-pass the sealed floor. Incorporation of a passive radon barrier into the floor of a modern house with less porous walls is likely to be effective. 

Bitumen roofing felt, damp proof courses, mastic sealant and adhesive type materials. 

Lucobit . [BASF AG] Ethylene copoly-mer/bitumen for pi. of damp-proof courses in construction of buildings, as protection against corrosion for steel tanks, for improving quality of road bitumen, for i od. of inj. molded parts. 

Damp Proof Course. An impervious layer below the surface of a floor, or through the width of a wall, designed to prevent moisture rising from the ground below. The usual materials are bituminous, but a course of ENGINEERING BRICKS (q.V.) is COOimon in older buildings. B.S.3921 specifies... 

WATER ABSORPTION limits for bricks for damp-proof courses of 4.5 (class 1) or 7.0 (class 2) the latter being recommended for external works. 

Raft with gas membrane sealed to gas-resistant Damp Proof Course (DPC) spanning walls/cavity... 

Aifano G, ChiancareUa C, Ciriilo E, Fato I, MaiteUotta F (2006) Long-term performance of chemical damp-proof courses twelve years of laboratory testing. Build Environ 41 1060-1069. doi 10.1016/j.bmldenv.2005.04.017... 

Bis-(Y-trimethoxysilylpropyl) amine Isocyanatopropyltriethoxysilane Trimethoxysilylpropyidiethylene triamine course mfg., damp-proof construction Polyisobutene coverings, floors Asbestos coYerings, roller... 

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