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Flashings Flashing material should be sufficiently tough and flexible so as to resist puncture and cracking. In addition, it should not be subject to ultra-violet deterioration or other deterioration when in contact with metal, mortar, or with elastic sealants. Flashing materials are generally formed from sheet metals, bituminous-coated membranes, rubber, or combinations thereof. The selection is largely determined by cost and suitability. Acceptable bituminous membranes do not include asphalt-impregnated felt. The cost of flashing materials vary widely. It is suggested, however, that only superior materials be selected, since replacement in the event of failure is extremely expensive. See BIA Technical Notes 7A Revised. Glazed
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