Releases of lead from construction sheeting used in the Canadian building industry
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Environment and Climate Change Canada
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This document is based on a report, commissioned by Environment and Climate Change Canada, which was produced by Toxecology - Environmental Consulting Ltd.
The information contained within this document is provided for information purposes only and is intended to provide an overview of the use and release of lead ammunition and non-lead alternatives in Canada. The Government of Canada assumes no liability for any damage, injury, loss of property, loss of data, loss of any and all resources, or any negative influence what-so-ever, that may result from the public disclosure of this document by the Government of Canada and from any and all usage of the information contained within this document. Readers are cautioned to use the information contained in this document at entirely their own risk.
The purpose of this document is to present findings and conclusions on Environment and Climate Change Canada’s commitment to study lead construction sheeting in the Canadian building industry as identified in the Risk Management Strategy for Lead published in 2013
Environmental and health effects associated with lead
Lead is a naturally-occurring element found in rock and soil, yet widespread anthropogenic use has resulted in an increase of exposure to Canadians. Lead is a highly toxic metal found in air, soil and water, as well as in food, drinking water and some products including lead construction sheeting. It is listed on the List of Toxic Substances of the Canadian Environmental Protection Act, 1999 (CEPA 1999) and is currently subject to numerous federal, provincial, territorial and industrial regulatory and non-regulatory initiatives.
Human health risk associated with lead include adverse developmental, neurodevelopmental, neurodegenerative, cardiovascular, renal and reproductive effects. Known environmental hazards include toxicity to birds, fish, crustaceans, benthic invertebrates as well as plants and earthworms. An assessment of the most current scientific information was undertaken by Health Canada and published as the Final Human Health State of the Science Report on Lead, in February 2013. This report determined that although lead levels in
Risk management strategy for lead
In February 2013, the Government of Canada published the Risk Management Strategy for Lead, which outlined the current and planned control actions for
One of the priority areas identified for assessment is the release of lead from construction sheeting in the Canadian building industry.
Overview of the lead construction sheeting industry in Canada
Lead is one of the most malleable metals used for construction products. It can easily be shaped, formed, bent and cut to suit all applications including a variety of structures such as walls, floors, doors, window frames and cabinetry. Lead is also very resistant to corrosion (e.g., atmosphere, salt water, and most industrial chemicals) and is an effective waterproof and sound barrier. Lead sheets are usually sold by weight and are available as rolls or sheetsFootnote 1.
In Canada, lead sheets are mainly used for radiation protection and to a lesser extent in building applications such as flashing, cladding and roofing. The three Canadian lead sheet manufacturers produced approximately 738 tonnes of lead sheets in 2011, mostly for the domestic market. There were also approximately 124 tonnes (i.e., 14% of the total demand) of lead sheets imported into CanadaFootnote 2.
Lead remains the most effective material that meets the conditions and specifications set out in various construction and safety codes for radiation protection. Its high density and high mass attenuation coefficient make lead sheets the most common material used for radiation shielding applications
- facilities with X-ray machines (e.g., hospitals doctor and dentist offices);
- nuclear, industrial and research facilities;
- security scanners; and
- low-level nuclear waste storages.
It estimated that the Canadian demand for new lead constructions sheeting in radiation protection applications is about 574 tonnes per year. These applications are necessary to protect Canadians from radiation exposure. The total stock in use for this application was about 17,480 tonnes in 2011. The Government of Canada has developed safety codes and guidelines for installing, operating and dismantling X-ray equipment and addresses lead sheeting. For more information: Clinical and Analytical Radiation: X-rays.
Alternatives to lead radiation protection
Alternatives to lead sheets and other lead products (e.g., lead bricks, lead glass, lead acrylic) which are used for radiation shielding may include various bricks, glass, acrylic, concrete blocks, barium plaster, gypsum wallboard, steel and wood materials. However, these alternatives are determined to be less effective and provide inconsistent levels of protection. The choice of material used depends on the level of shielding required and whether it is practical to install it. Certain alternatives such as bricks and concrete have internal voids which reduce their effectiveness. In general, alternatives require more material to obtain the equivalent shielding protection compared to lead sheets, which would likely result in additional costs (see table below).
|Lead thickness (mm)||Steel (mm)||Barium plaster (mm)||Concrete (2350 kg/m3) (mm)||Plate glass (mm)||Brick (Oxford clay, 1650 kg/m3) (mm)||Gypsum (mm)||Wood (mm)|
Source: Based on Radiological Protection Institue of Ireland (RPII). The Design of Diagnostic Medical Facilities where Ionising Radiation is used. A Code of Practice issued by RPII in June 2009
Flashing, roofing and cladding
Historically, lead sheets were widely used for building flashing, cladding and roofing and continues to be used on heritage buildings (e.g., some churches). These uses are much less common in Canada compared to Europe. In Canada, about 26% of lead construction sheeting is used in flashing, cladding and roofing) compared to 90% in Europe. This is mainly due to differences in architectural style, climatic conditions and traditional use.Footnote 4
Alternatives to lead flashing, roofing and cladding
Many alternatives to flashing roofing and cladding are already widely used in Canada including:
- metals (e.g., aluminum, steel, copper)
- polymers (e.g., ethylene propylene diene monomer (EPDM), thermoplastic elastomer, polyolefin, polyvinyl chloride (PVC) and polyisobutylene)
- modified bitumen membranes (e.g., aluminum-reinforced styrene ethylene/butylenes styrene and atactic polypropylene)
- fibre composites (e.g., glass reinforced polyester) and
- other traditional materials (e.g., asphalt shingles, cedar, slate, concrete tiles, clay roofing tiles).
The choice of material depends on the budget, desired performance, climate, design choices, aesthetics, building codes and structural requirements. Metal materials are very durable,
Other lead sheeting applications
Lead releases and human exposure from construction sheeting material
Releases to the environment can occur throughout the entire lifecycle of lead sheeting products but are generally associated with leaching during use and disposal when recycled after a building is demolished.
Fortunately, most lead sheets used in Canada are encased in interior building walls for radiation protection and sound proofing application, therefore, remain there for the life of the building.
Since the lead sheeting is not exposed to the elements, lead is not released into the environment when used this way.
Conversely, lead used in flashing, roofing and cladding applications can slowly leach out of the sheeting when exposed to the elements. In 2011, it is estimated that about 5 grams per square meter per year (g/m2/year) (or approximately 0.5 tonnes/year) was released in Canada during the service life of these applications.Footnote 6
Due to the high market value of lead, lead sheets are normally recovered when renovating or demolishing buildings. In 2011, approximately 766 tonnes of lead sheeting was sent to secondary smelters for recycling.Footnote 7 Since 1991, this source of release has been controlled under the Secondary Lead Smelter Release Regulations. They limit the concentration of particulate matter containing lead emitted into the ambient air from defined sources within secondary lead smelting facilities.
Since lead can be found in a wide range of products, other lead products may be disposed of in landfills. Based on landfill monitoring data 2013, it is estimated that less than 0.360 tonnes of lead per year is released to surface water from landfills in Canada. It is impossible to differentiate between lead sheeting and other lead products that may contribute to the landfill leachate.Footnote 8
Lead exposure from construction sheeting primarily occurs during the installation, recovery and disposal of the sheeting products. Exposure may also occur under certain conditions when it is used for balconies and verandas because oxidation can result in lead oxides and carbonates to be physically transferred upon contact. However, installed lead sheets used in flashing, cladding and roofing are not expected to be associated with frequent or sustained human contact. Exposure to lead may also occur during regular maintenance and repair work on buildings that contain lead sheeting products, or from rainwater runoff when lead sheeting products are used for architectural purposes.Footnote 9
Existing risk management controls
There are no federal regulations restricting the use of lead sheeting in Canada. However, a number of building standards and codes promote its use due to its physical and chemical properties which meet the conditions and specifications set out in construction and safety codes (such as corrosion resistant, density, shielding protection and attenuation coefficient).
- The National Building Code of Canada provides guidelines on the types of materials suitable for flashings and their recommended thickness. Recommended materials include lead, galvanized steel, copper, zinc and aluminum metals as well as polyethylene.
- The Canadian Nuclear Safety Commission’s GD-52: Design Guide for Nuclear Substance Laboratories and Nuclear Medicine Rooms specifies the requirement for appropriate shielding in its design guide for nuclear substance laboratories and nuclear medicine rooms which are typically shielded using lead sheeting from 0.8 mm to 3.2 mm in thickness.
Through the ongoing work of the Canadian Council for Ministers of the Environment (CCME), federal, provincial and territorial governments have indicated their intentions in addressing construction and demolition materials to support efforts to enhance resource recovery and foster environmentally sound management. This includes lead-containing products. Specifically, in 2009, under the CCME Canada-wide Action Plan for Extended Producer Responsibility (EPR), jurisdictions committed to working towards incorporating certain construction and demolition materials into operational EPR programs by 2017. The CCME is also exploring a vision and strategy to support continued work on waste, which is anticipated to include linkages to the management of
The European Lead Sheet Industry Association has developed an industry code of practice to manage lead sheets installed as a building or construction product to limit where individuals may come into physical contact with
The International Green Construction Code has provisions that prohibit the use of various materials including lead flashing when the collected water is to be treated to potable water standards.
Denmark is the only country that has National legislation banning the use of lead flashing and roofing for new buildings. However, the ban does not apply to the renovation or repair of existing buildings.
Recently, lead sheets were established as a “green” building material by a UK-based research institute. Lead sheets used in lead roofing and vertical cladding installations received a rating of A or A+ in the Building Research Establishment - Green Guide to Specification. It specifies that lead used in these applications has a carbon footprint of between 30 and 76 kg of carbon dioxide (CO2) per kg of material, considerably lower than similar installations using copper, zinc and stainless steel.
The use of lead sheet for industrial radiography purposes is recommended by several American national standards in order to minimize worker exposure to radiation.
Forecast of lead sheeting demand in Canada
Figure 1: Demand for lead construction sheeting in Canada 2007 to 2025 (tonnes per year)
|Year||Radiation protection||Flashing/ Roofing|
Note: This graph assumes uses in radiation protection to remain stable and flashing/roofing applications to gradually decline by 1% per year based on industry consultations
For radiation protection applications, lead sheeting remains the most economical and effective material to meet the standards set in various building and safety codes when compared to existing alternatives. The lead used for these applications is generally recovered and recycled. Due to health and safety requirements, it is expected that lead sheeting will continue to be the predominant material for radiation protection applications and the demand is forecasted to remain constant over the next five to ten years.
With respect to lead sheeting used for flashing, cladding and roofing applications, alternatives are already available in the Canadian market and industry has demonstrated efforts to move towards greater use of these alternatives, where it is technically and economically feasible. The total demand in Canada for lead sheeting in these applications is projected to continue to decline over the next ten years.
Given the small quantities and the limited exposure potential in the current Canadian context, the Government of Canada proposes to take no further action at this time on lead construction sheeting in the building industry. The market will continue to be monitored and new information relating to alternatives and releases in Canada will be evaluated as warranted.
For more information, please send an email to firstname.lastname@example.org use “Lead construction sheeting” in the subject line of your message.
Canadian Nuclear Safety Commission. (2014). GD-52: Design Guide for Nuclear Substance Laboratories and Nuclear Medicine Rooms. Available from: http://nuclearsafety.gc.ca/eng/acts-and-regulations/regulatory-documents/published/html/gd52/ (accessed 17 Feb. 2014) (Date modified: 2014-02-03)
[CCME] Canadian Council of Ministers of the Environment. (2009). Canada-wide Action Plan for Extended Producer Responsibility. PN 1499
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