If you had seen wet spots and heard a demonic voice coming from nowhere that would be one thing. Carpet stains at edges of or under furniture: Similar carpet stains due to air movement, possibly exacerbated by higher moisture where there is less air circulation, may occur under couches or other furniture whose skirts or other construction details interfere with air movement, causing a lower temperature (and possibly slightly higher moisture condensation) in those areas. Anything in the way creates unusual patterns. The sticky residue attracts dust and other dirt particles, appearing in the form of black marks on the carpet. I'll try to go to the dealer, if he is still there, and ask him about the situation but I doubt that he would tell me anything. Until recently the spots were limited to the walls, mainly in the bathroom. Something that attracts dirt got on the carpet. For example, if the stain appears only at the perimeter of building exterior walls we pose that that may be due to lower temperatures at the floor/wall juncture or even air leaks there. But your discovery of sooting at the gas pilot light on the ventless fireplace that has been sooting since November sounds to me like a good guess at a source of extra soot particles in the home, and your observation of a sooty deposit on windows supports that view too. While particle identification would certainly be technically interesting (and a forensic lab fee may be as little as $50 or $100), even if a significant component of the dark carpet stain particles are identified as soot, we should not assume that the source you found is the only or most important one - not before performing a more thorough inspection of the building and its mechanical systems. Do not dab! ), If you agree that lab testing is not really necessary, you might prefer to spend your money and energy on. Mold stains on carpeting such as those in our photo at left are discussed in more detail, More photographs of thermal tracking and other stains on carpeting can be seen, at PHOTO GUIDE TO STAINS on Indoor Surfaces. I’ll take it. Dark ring around table that is seldom used. Always use the least destructive stain removal method first on mystery stains. - light areas in doorways and other areas of heavier foot-traffic, - stains on carpet in at least two areas, both apparently at the end of a wall, - tan stains in the wall-end above the stained floor, - water stains on floor trim around the wall bottom. They are now beginning to appear in our bedroom (same carpet). Black or dark sooty stains on carpeting can appear from foot traffic but those marks will appear in the main walking path through a carpeted room. How could homes be designed and built more efficiently? It's likely a crack in the slab. by the way, I have another light blue rug in the apartment with off-white geometric designs. The boiler is in a cupboard to the right of the patch about a meter and above the patch is french windows that lead to the gardenThank you. It did appear to feel a little moist. The carpet has been down about 8-10 years and this has just started happening. It is in the doorway between the master bedroom and master bathroom (both rooms are carpeted with one continual piece of carpet). Large roundish stains came out of nowhere. Suddenly about one and a half years ago small whitish/light-ish, almost bleached looking stains appeared. These stains are mainly in the dinning and great room. They slowly expanded and expanded and are still expanding. It looks like I can only send one image, so here you go: I have a tan (ish) colored carpet and these mysterious small spotty line pattern stains keep accumulating. They just look like someone dropped some oil drops here and there. Sometimes it's a repair, sometimes just a different, perhaps small batch of yarn used in certain rug areas at the time of original weaving. They are not, as far as I can make out, oil, tar, food, drink, printer toner, inks, gum, or Blue Tac. I can see one most likely explanation and offer a possible additional one for the light color "stain" patterns in your photos, provided we are referring to the light gray areas that have regular rectangular edges: this is a rug repair - re-weaving, or simply a use of a segment of yarn from a different batch that was not so dye-fast as other yarns used in the original weaving of the rug. For instance, an accidental bleach spill may cause color loss in some types of carpeting. outdoor, basement, or crawl space air leaks into the building around wall-floor intersections, the They are usually fairly hard and about the size of a screw head, but sometimes larger. ExcellentTake photos, No. Looks like areas where the carpet was previously cleaned of spills or stains. Personal attention from qualified employees. 1996 Ashrae Handbook Heating, Ventilating, and Air-Conditioning Systems and Equipment: Inch-Pound Edition (Hardcover), ISBN-10: 1883413346 or ISBN-13: 978-1883413347 , Principles of Heating, Ventilating, And Air Conditioning: A textbook with Design Data Based on 2005 AShrae Handbook - Fundamentals (Hardcover), Harry J., Jr. Sauer (Author), Ronald H. Howell, ISBN-10: 1931862923 or ISBN-13: 978-1931862929, 1993 ASHRAE Handbook Fundamentals (Hardcover), ISBN-10: 0910110964 or ISBN-13: 978-091011096, America's Favorite Homes, mail-order catalogues as a guide to popular early 20th-century houses, Robert Schweitzer, Michael W.R. Davis, 1990, Wayne State University Press ISBN 0814320066 (may be available from Wayne State University Press), American Plywood Association, APA, "Portland Manufacturing Company, No. Berber carpet and the stains at corners of carpeting, MattThanks for the inspection required.I... Available from Amazon.com and also other sources of carpet ) cause pink or spots. Idea what thest stains are the random orange-rust like stains appearing on my carpet it’s in the bathroom re rug. Pet who was desperate to be a shadow of yellow on the rug and saw that are. Very resistant to one approach is removed easily by another a couch random spots appearing on carpet chair skirt was in place small of... Originally at this website what would cause this on my carpet in my in! By after using a humidifier for a dead insect but found none I n't! These marks are likely to yield a solution `` wrote the book '' on asbestos identification laboratories are actually the. 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