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ROOFING INSPECTION & REPAIR
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SNOW GUARDS & SNOW BRAKES
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STRESS SKIN INSULATED PANELS
TEST LABS - ROOF SHINGLE
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TRUSSES, Floor & Roof
UNDERLAYMENT REQUIREMENTS on ROOFS
VENTILATION in BUILDINGS
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WORKMANSHIP & ROOF DAMAGE
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Lead Coated Copper and Health Effects:
"Lead Coated Copper Metal (LCC): A Case Study of Public Health Addressing Regulatory Gaps", Thomas Plant, MS, Leon Bethune, MPH, John Shea, MS, Paul A. Shoemaker, MPH, Jose R. Diaz, John W. Weathers, and Charles Mba, MS. Environmental Health Office, Boston Public Health Commission, 1010 Massachusetts Ave, 2nd floor, Boston, MA 02118, 617-534-2644, email@example.com 2007 Abstract:
Several queries about the effects of lead in roofing systems led us to find this 2002 Q&A offered by NRCA's Jack Robinson, RRC., Quoting:
Question: What are the advantages of using lead or lead-coated copper when installing standing-seam metal roof systems? Are there any government regulations that prohibit or limit the use of lead or lead-coated copper in roof systems? Also, will water that runs off a roof system made from either of these materials pollute groundwater?
Answer: Lead is a soft, common metal with several properties that are useful in roofing applications. Lead-coated copper is copper sheeting coated with lead on one or both sides.
Because lead is malleable, it easily is shaped at relatively low temperatures (70 F [21 C]) without the need for periodic annealing to soften the lead and make it workable. Lead sheets can be manipulated readily with hand tools and formed into complicated shapes. When used for flashings, lead sheets can be formed and adjusted easily in the field to accommodate substrate irregularities.
Lead also is corrosion-resistant. When left exposed, it develops a silver-gray patina that is insoluble in water. Because of the patina's insolubility, rainwater runoff over a weathered lead surface carries little lead or lead-based chemicals. Water runoff from lead surfaces will not cause stains to be deposited on adjacent building materials, such as stone, masonry or cladding.
Lead-coated copper has several advantages when used to form metal roof systems. It provides a durable finish that can be left exposed or painted, and lead coating is more compatible with paint than other metals. Lead-coated copper also is lighter than lead sheets, which reduces roof panels' weight contribution to a roof assembly's dead load. Lead-coated copper, unlike copper, won't stain adjacent materials. It also is easier to form than plain copper because the lead coating acts as a lubricant.
Both lead and lead-coated copper are durable roofing materials with longer estimated service lives than other common steep-slope roof coverings.
In recent years, publicity regarding the toxicity of lead-based paint has been widespread. Many people incorrectly have assumed any exposed lead is a potential health hazard or pollutant.
As previously stated, exposed lead sheets and lead-coated copper are not significantly soluble in water. The same property that prevents lead from depositing stains on adjacent materials also prevents lead or lead-based compounds from being washed off a roof system's surface and carried into groundwater.
Some manufacturers of lead roof coverings have attempted to respond to the public's concerns by providing calculations of lead contamination for specific projects. These calculations take into account a roof system area that will contribute to watershed, estimated average amount of rainfall at a project's location and lead's corrosion rate.
Several of these calculations indicate that the contribution of lead to groundwater attributable to water runoff from a lead roof system is one to two parts per trillion. The level at which the Environmental Protection Agency (EPA) imposes restrictions for lead in drinking water is 15 parts per billion (approximately 15,000 times less than the amount of lead contamination attributable to water runoff from a lead roof system).
According to EPA representatives, there are no regulations that restrict or prohibit the use of lead or lead-coated copper in roof systems. However, should a question arise about a specific project, contact your regional EPA office for additional information. A list of EPA's 10 regional offices can be obtained from EPA's Web site, www.epa.gov.
Additionally, some states may have regulations governing lead usage. To determine whether your state has specific requirements that regulate or prohibit the use of lead or lead-coated copper roof systems, contact your state's environmental protection agency.
You should be aware there is an Occupational Safety and Health Administration (OSHA) standard that applies to those who work with lead—"The OSHA Guide to Occupational Standard for Lead (General Industry)." For information about this standard, contact Ken Brown, NRCA's director of risk management, at (847) 299-9070, Ext. 262.Web search 09/29/2010, - original source:
Articles on Lead Hazards In and Around the Home
LEAD POISONING HAZARDS GUIDE
Best Practices Guide to Residential Construction lists these producers and sources of metal roofing, metal roof fastening systems, and related metal roofing products
-- Adapted with permission from Best Practices Guide to Residential Construction.
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