![]() ![]() Building leaks behind installed siding at improperly-flashed butt joints: Water or moisture enters fiber cement siding possibly water leaking into the wall behind siding, but unlikely, through improperly-located (too close in successive courses) butt joints.Significant wetting of the back side of fiber cement boards or panels is likely to contribute to significantly greater expansion in the material than that anticipated by ASTM C1185. Building leaks behind installed siding at wall penetrations: Water or moisture enters fiber cement siding possibly through improper flashing and sealing around wall penetrations (windows, doors, etc).We'd need to see some independent lab tests but from the products I've seen water entry into the product seems to occur from the following sources: See Dargontina (2007).īut I agree that manufacturers may vary in the quality and thickness of coating on the various surfaces of the fiber cement siding and that such might cause variation in moisture uptake during storage. ![]() Now the surfaces of FC siding in storage, transit, handling, may be abraded, possibly compromising the water resistance of the material in less obvious or even subtle ways. OPINION: Consider this simple argument: if fiber cement boards as shipped from the factory are coated with a waterproof coating on all six surfaces, why would they be vulnerable to weather or water damage prior to installation? It's only at installation that the boards are cut. Thailand, Tel: Europe: +44 (29) 212 86505, Thailand: +66 (2) 291 2888 retrieved, original source - Protection of Fibre Cement Siding from Weather Before Installation This leads to composite consolidation and the result is an extremely strong and robust fibre composite material." - Shera™ Fibre Cement Building Materials, 2426/3 Mahaphant Building, In autoclave technology, polymer based composites are manufactured by applying intense heat and pressure to eliminate moisture from fibre cement materials. The fibre cement mixture, is deposited on a felt band substrate, vacuum de-watered,and cured to form a fibre reinforced cement matrix in sheet form. In the Hatscheck Process, unbleached cellulose fibers are re-pulped in warm water at an alkaline pH of 11 to 12.5 the re-pulped fibers are refined and then mixed with cement, silica sand, and other additives to form a mixture. " The Hatsheck process was initially developed for the production of asbestos composites, but it is now used for the manufacture of non-asbestos, cellulose fibre reinforced cement composites. Possible Sources & Extents of Water Penetration into Fiber Cement Siding Why Fibre Cement Siding Products Should be Dry When Leaving the Factory The article includes research on the sources, causes & effects of water absorption into fiber cement building products. This article describes the probable causes & effects of moisture-uptake problems that occur in fiber cement siding shingle & shake installations in North America, including fiber cement shingle shrinkage gaps at butt joints, cracks, breaks, and loose or buckling shakes. Wet fiber cement siding fiber cement shingle, shake or clapboards formed moisture sources & effects: We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest. ![]()
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