Buy-Recycled Series
CONSTRUCTION PRODUCTS
COMPREHENSIVE
PROCUREMENT
GUIDELINES
CONSTRUCTION
Construction project man-
agers across America are
learning that recycled-
content construction products
are cost-effective, reliable, easy
to obtain, and environmentally
friendly. Whether you are erect-
ing a new building or construct-
ing a new highway,
high-quality recycled-
content products can
help you get your proj-
ect off to a great start!
Buying recycled products...
...conserves natural resources
...saves energy
...reduces solid waste
...reduces air and water pollutants
...reduces greenhouse gases
...creates new jobs
©EPA
EPA530-F-07-036
www.epa.gov/osw
October 2007
To make it easier to
buy recycled, the U.S.
Environmental Protec-
tion Agency (EPA) pe-
riodically updates the
Comprehensive Procure-
ment Guidelines (CPG).
Through the CPG, EPA
designates items that
must contain recycled
materials when pur-
chased with appropriated
federal funds by federal,
state, and local agen-
cies, or by government
contractors. Several
construction products
are among these items.
EPA's research shows
that the items designated
in the CPG are of high
quality, widely avail-
able, and cost-competitive with
virgin products. EPA also issues
nonregulatory companion guid-
ancethe Recovered Materials
Advisory Notice (RMAN)that
recommends levels of recycled
content for these items.
Why Buy Recycled?
Recycling is more than just
dropping off your cans, bottles,
and newspapers at the curb or
at a local collection facility.
Diverting recyclables from the
waste stream is only the first
of three steps in the recycling
process. The second step oc-
curs when companies use these
recyclables to manufacture new
products. The third step comes
when you purchase products
made from recovered materials.
Buying recycled products re-
sults in many environmental
benefits. It supports local re-
cycling programs by creating
markets for the collected mate-
rials that are processed and used
to manufacture new products.
This creates jobs and helps
strengthen the economy; con-
serves natural resources; saves
energy; and reduces solid waste,
air and water pollutants, and
greenhouse gases that contrib-
ute to global warming.
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What Is CPG?
The Resource Conservation and Recovery
Act (RCRA) requires procuring agen-
cies to buy recycled-content products
designated by EPA in the CPG. Issued in May
1995, the first CPG designated 19 new products
(including carpet, floor tiles, and laminated
paperboard) and incorporated five previously
designated items (including building insula-
tion and cement and concrete) in eight product
categories. The first CPG update (CPG II) was
published in November 1997 and designated
an additional 12 items, including shower and
restroom dividers/partitions and reprocessed
and consolidated latex paint. A second CPG
update (CPG HI) was published in January 2000
and designated an additional 18 items, includ-
ing carpet cushion, flowable fill, and railroad
grade crossing surfaces. The third CPG update
(CPG IV), published in April 2004, designated
seven new products, including modular thresh-
old ramps, nonpressure pipe, and roofing ma-
terials. It also revised the designation for three
items, including cement and concrete, polyester
carpet, and railroad grade crossing surfaces.
The fourth CPG update (CPG V), published in
September 2007, designated one new item and
revised another designation, but did not desig-
nate any new construction products. For more
information, visit .
Procuring agencies include all federal agencies,
and any state or local government agencies or
government contractors that use appropriated
federal funds to purchase the designated items.
If your agency spends more than $10,000 per
year on a product designated in the CPG, you
are required to purchase it with the highest
recycled-content level practicable. The CPG
also applies to lease contracts covering desig-
nated items. Executive Order (E.O.) 13423 and
the Federal Acquisition Regulation also call for
an increase in the federal government's use of
recycled-content and environmentally prefer-
able products.
Once any new items are designated in a pub-
lished CPG update, an agency has 1 year to
develop an affirmative procurement program
(or revise an existing one) to include these new
items. In previous years, agencies have had to
revise their affirmative procurement programs
to incorporate buy-recycled requirements for
items such as construction board, thermal insu-
lation, floor tiles, carpet, shower and restroom
dividers/partitions, reprocessed and consoli-
dated paint, carpet cushion, flowable fill, and
railroad grade crossing surfaces. Agencies must
have revised their affirmative procurement
programs to include the new items designated
under CPG IV by April 30, 2005. This effort
might have involved reviewing specifications
for these products and eliminating provisions
that pose barriers to purchasing them with re-
cycled content (such as aesthetic requirements
unrelated to product performance). Since CPG
V designates no new construction products,
agencies are not required to revise this portion
of their affirmative procurement program.
The CPG acknowledges that specific circum-
stances might arise that preclude the purchase
of products made with recovered materials.
Your agency may purchase designated items
that do not contain recovered materials if it de-
termines that: 1) the price of a given designated
item made with recovered materials is unrea-
sonably high; 2) there is inadequate competition
(not enough sources of supply); 3) unusual and
unreasonable delays would result from obtain-
ing the item; or 4) the recycled-content item
does not meet the agency's reasonable perfor-
mance specifications.
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Key Terms
Before purchasing construction products containing recovered materials, you might need to
review certain key terms:
Cenospheres: Additives similar to coal fly ash and ground granulated blast furnace
(GGBF)slag. Cenospheres occur naturally in fly ash, the largest byproduct of coal-fired power-
plants. They are microscopic spheres made of silica and alumina and are filled with air or
other gases.
Coal fly ash: A byproduct of coal burning at electric utility plants. It is called "fly" ash be-
cause it is transported from the combustion chamber by exhaust gases.
Consolidated paint: Post-consumer latex paint with similar characteristics (such as type,
color family, and finish) that is consolidated at the point of collection. The post-consumer
paints are blended together and repackaged, usually with few or no new ingredients added
to improve the performance of the resulting paint.
Flowable fill: A wet, flowable slurry made up of coal fly ash, water, a coarse aggregate (such
as foundry sand), and a portland cement that is used as an economical fill or backfill materi-
al. It can take the place of concrete, compacted soils, or sand commonly used to fill around
pipes or void areas.
Foundry sand: Clean, high-quality silica sand or lake sand from both ferrous and nonferrous
metal castings.
GGBF slag: A byproduct of iron blast furnaces. The slag is ground into granules finer than
portland cement and can be used as an ingredient in concrete.
Laminated paperboard: Boards made from one or more plies of kraft paper bonded together
and used for decorative, structural, or insulating purpose.
Modular threshold ramps: Devices used to modify door thresholds and other small rises,
particularly with regard to improving access for people with disabilities. Threshold ramps
can be made of recovered steel, aluminum, or rubber.
Nonpressure pipe: Pipe used for drainage and as conduit in construction, communications,
municipal, industrial, agricultural, and mining applications. Most nonpressure pipe is made
with polyvinyl chloride (PVC) and high-density polyethylene (HOPE).
Reprocessed paint: Post-consumer latex paint that has been sorted by a variety of charac-
teristics that are dictated by the recycler. In general, the paint is sorted by type (i.e., inte-
rior versus exterior), by light and dark colors, and by finish (i.e., high-gloss versus flat). The
reprocessor adds raw materials to meet the performance and color requirements expected or
required by the end user.
Rock wool: A composition of fibers manufactured from slag or natural rock and used in
building insulation.
Silica fume: A waste material recovered from alloyed metal production. It is the solid waste
collected on filters of electric arc furnace stacks. A grain of sand is about 1,000 times larger
than a silica fume particle.
Structural fiberboard: Panel made from wood, cane, or paper fibers matted together and used
for sheathing, structural, and insulating purposes.
mm
CONSTRUCTION PRODUCTS
PAGE .3
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How Do I Purchase Recycled-
Content Construction Products?
EPA issues purchasing guidance in
RMANs, which are designed to make it
as easy as possible to buy the designated
items. The RMANs recommend recycled-con-
tent levels to look for when purchasing con-
struction products, as shown in the table below.
Following the RMANs' recommended levels
will help ensure your affirmative procurement
program and standards meet the buy-recycled
requirements. The RMANs also provide other
purchasing guidance. Please refer to for more information on
individual products.
Rather than specifying just one level of recycled
content, the RMANs recommend ranges that re-
flect actual market conditions. The recommen-
dations are based on market research identifying
recycled-content products that are commercially
available, competitively priced, and meet buyers'
quality standards.
Access EPA's online recycled-content products
database by going to and se-
lecting "Supplier Database." See the last section
of this resource guide for other helpful resources.
EPA's Recommended Content Levels for Construction Products
CONSTRUCTION
PRODUCT
Rock Wool Insulation1
Fiberglass Insulation1
Cellulose Insulation
(loose-fill and spray-on)1
Perlite Composite Board
Insulation1
Plastic, Non-woven Batt
Insulation1
Plastic Rigid Foam,
Polyisocyanurate/
Polyurethane: Rigid Foam
Insulation1
Foam-in-Place Insulatio
;
Glass Fiber Reinforced
Insulation1
henolic Rigid Foam
lation1
Structural Fiberboard1
Laminated Paperboard1
MATERIAL RECOVERED
Slag
Glass Gullet
Post-consumer Paper
Post-consumer Paper
Recovered and/or Post-
consumer Plastics
Recovered Material
Recovered Material
Recovered Material
Recovered Material
Recovered Material
Post-consumer Paper
POST-CONSUMER
RECOVERED
CONTENT
75%
23%
100%
TOTAL
RECOVERED
CONTENT
75%
20-25%
75%
23%
100%
9%
5%
6%
5%
80-100%
100%
CONSTRUCTION PRODUCTS
PAGE 4
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CONSTRUCTION
PRODUCT
Cement and Concrete2
'olyester Carpet Face
Fiber13
Floor Tiles (Heavy Dut
Commercial Use)1
Shower and Restroom
Dividers/Partitions1
Latex Paint:1
- Consolidated5
- Reprocessed6
- White, Off-White,
Pastel Colors
- Grey, Brown,
Earthtones, and
Other Dark Colors
Carpet Cushion:1
- Bonded Polyurethane
-Jute
- Synthetic Fibers
- Rubber
MATERIAL RECOVERED
Coal Fly Ash
GGBF Slag
Cenospheres
Silica Fume
Polyethylene
Tereph thai ate
Resin
Rubber or Rubber
Blends
Plastic or Plastic Blends
Rubber
Plastic
Recovered Material
Recovered Material
Recovered Material
Old Carpet Cushion
Burlap
Carpet Fabrication
Scrap
Tire Rubber
Coal Fly Ash
Flowable Fill Containing
Coal Fly Ash and/or
Ferrous Foundry Sands7 Ferrous Foundry Sands
POST-CONSUMER
RECOVERED
CONTENT
See Endnote 2
See Endnote 2
25-100%
90-100%
90-100%
20-100%
16%
67%
100%
20%
50-99%
15-50%
40%
60-90%
See Endnote 7
TOTAL
RECOVERED
CONTENT
See Endnote 2
See Endnote 2
Minimum of 10% (by
volume)
5-10% of cementitious
material (dry weight
basis)
25-100%
90-100%
90-100
20-100%
25-30%
100%
100%
20%
50-99%
15-50%
40%
100%
60-90%
See Endnote 7
CONSTRUCTION PRODUCTS
PAGE 5
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CONSTRUCTION
PRODUCT
Railroad Grade Crossing
Surfaces:
- Concreate
- Rubber
- Steel4
Wood10
Plastic11
Modular Threshold Ramps
MATERIAL RECOVERED
POST-CONSUMER
RECOVERED
CONTENT
^^^H ^^^H
ioofing Materials
Coal Fly Ash8
Tire Rubber
Steel4
Wood or Wood
Composite
Plastic or Plastic
Composite
Steel12
Aluminum
Rubber
Steel4
Plastic - HDPE
-PVC
Cement
Steel1
Aluminum
Fiber (felt) or Fiber
Composite
Rubber
Plastic or Plastic/
Rubber Composite
Wood/Plastic
Composite
Cement
16%
67%
90-97%
85-95%
16-67%
100%
16%
67%
100%
5-15%
See Endnote 2
16%
67%
20-95%
50-100%
12-100%
See Endnote 2
TOTAL
RECOVERED
CONTENT
15-20%
85-95%
25-30%
100%
90-97%
100%
25-100%
10%
100%
25-30%
100%
100%
25-100%
See Endnote 2
25-30%
100%
20-95%
50-100%
100%
100%
100%
See Endnote 2
EFAs recommendation! do not preclude procuring agencies from purchasing construction products manufactured usine other materials EPA simply recommend?. that procuring agencies, when purchasing construc-
tion products designated in the procurement juldelmes, purchase these produce containing recovered materials
EPA recommends that procuring agencies prepare or revise their procurement programs lor cement and concrete or [or construction projects involving cement and concrete to allow the use of coal fly ash, GGBFslag,
.sens-spheres, or silica fume -i: ippiypmto. EFA does not recommend that procuring agencies favor one recovered material over the other Rather, EPA recommends that procuring agencies consider the use of all ->[
these recovered material and choose the one Cor the mixture of them) that meets their performance requirements, consistent with availability and price considerations EPA also recommends that, procuring a^erncies
specifically Include provisions IIT a 11 construction contracts to allow for the 'use, as optional or alternate materials, of cement or concrete winch contains coal lly ash, GCBE slag, cenospheres, or silica fume, whet-- ap-
propriate Due to variations in cement, strength requirements, costs, and oonstrucrion pracnces. EFA is not recommending recovered materials content levels for cement or concrete containing coal fly ash, G'GBF slag,
cenospheres. c r silica lume Additional tntvrraatiou car, he tound m the RM'AH at ,'.www.epa.gov/cpg/pdl/rmanal4.pd]>
EPA rec.-mmends that procuring agencies establish minimum content: standards for use in purchasing polyester carpet for moderate-wear applications. This tecomsmemdation does not include polyester carpet for use
in heavy- or severe-wear applications.
The recommended recovered materials content level for steel in this table reflects the fact that the designated items can be made from steel manufactured from either a Basic Oxygen Furnace (BOF) or an Electric Arc
Furnace (EAF) Steel horn the 'BQF process contains 25-30 percem total recovered materials, of which 16 percent is post-consumer steel. Steel from the EAF process, contains, a iota I of 100 percent recovered steel, of
which 67 percent is post-consumer.
overing graffiti, where color and consistency of performance are not primary concerns
terior and es-sterior architectural applications such as wallboard, ceilings, and trim: gutterboards; and concrete, stucco, masonry, wood, and metal surfaces
gencies use flowablc fill containing coal fly ash and/or ferrous foundry sands for backfill and other fill applications EPA further recommends that procuring agencies include piovi
involving backfill or other Ell applications to allow [or die use of ilowable fill containing coal By ash and/or ferrous foundry sands, where appropriate. The specific percentage ol
ds used in llov.'abie fill depends on the. specifics of the job, including tile type of coal fly ash used (.Class C or Class FJ, the strength, set time, and ilowability needed; and bleeding
ot recommending specific coa I fly ash or ferrous foundry sands content levels for procuring agencies to use in establishing minimum content standards for flowable fill . However
ypical prop'ortions used in flowable fills, as well as specifications and recommended lest methods, are provided by EPA and. can be found in the Consolidated RMAH tor the CPG An
t ran bo viewed at .
edierit of concrete slabs, pavements, or controlled density fill product, depending on the type of concrete crossing system installed. Higher percentages of coal fly ash can be used In
. the higher percentages help to produce a more workable and durable product but can prolong the curing process.
f e --'" c) ma terra k. content levels for rubber railroad grade crossing surfaces are based on the weight o'f the raw materials, exclusive of any additives such as binders
; . " i, : made trom recovered wood also may contain other recovered materials such as. plastics. The percentages. of these materials contained m the product also would count toward the
Consolidatec
Pcptocc;.c-dkles: punt used!
EPA recommend; that procuri
sions in all construction contr;
coal By ash or ferrous foundry
and shrinkage Therefore, EPA
additional information regardi
electronic version of this docu
Coal fly ash can be used as an
the. concrete m:
The recomrnen
d lor
Railroad grade crossing surfaces made from recovered plastics also may contain other lecovercd materials such as s
tamed m the product also would count toward the .recovered materials content level of the item.
The recommended recovered materials content lewis, for steel in this table reflect the fact that the designated item
BG5 i - Eess contains 25-30 percent total recovered steel, ol which 16 percent is post^consumer y.eel [rom the FJ
tag i ' mdiistiv sources, modular threshold ramps containing a combination of BOF and EA.F steel would contain ;
no way .of knowing which type of steel was used in the manufacture of the item, the post-consumer and total recovered material com
EAF steel only, BOF steel only, or a combination of the tswo
h redder residue, which contains z mix of materials. The
contain steel manufactured in either a EOF or an EAT; or
of these matcnals r
ombmation.of both. Steel from the
l percent is post-consumer Accord-
process contains 100 percent total recovered steel, of v
-85 pe rcent total recove red steel, of which 16-67 percent would be post-consumer. Since there is
nges. in this table encompass the whole range of possibilities, i.e., the use of
CONSTRUCTION PRODUCTS
PAGE 6
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How Can I Get More Information?
T
his resource guide and the following resourc-
es on buying recycled-content products can
be accessed on the Internet.
Information Available
From EPA
The CPG: . This site de-
scribes EPA's effort to facilitate the procurement
of products containing recovered materials,
including information on CPG and RMANs, and
an online database of manufacturers and suppli-
ers of designated items.
EPA CPG Program: . EPA's EPP program encour-
ages and assists federal agencies in purchasing
environmentally preferable products and ser-
vices. The site explains EPA's proposed guiding
principles for including environmental per-
formance in purchasing decision-making, and
includes case studies of successful pilot projects
in both the public and private sectors.
Jobs Through Recycling: .
EPA's Jobs Through Recycling program stimulates
economic growth and recycling market develop-
ment by assisting businesses and supporting a
network of state and regional recycling contacts.
This Web site provides information on financing
and technical assistance for recycling businesses,
as well as other market development tools.
Municipal Solid Waste: .
This site includes information on recycling,
source reduction, and reuse. Ft contains state
municipal solid waste data and the latest facts
and figures on waste generation and disposal.
WasteWise: . Waste-
Wise is a free, voluntary EPA program through
which organizations eliminate costly municipal
solid waste, beiiefitting their bottom line and the
environment. The program provides hands-on
assistance to members to help them purchase or
manufacture recycled-content products, prevent
waste, and recycle solid waste materials.
Federal Register (FR): and . Notices
promulgating CPG I (60 FR 21370) and RMAN
1 (60 FR 21386), May 1, 1995. FR notices
promulgating CPG II (62 FR 60961) and RMAN
II (62 FR 60975), November 13, 1997. FR notices
promulgating CPG III (65 FR 3070) and RMAN
III (65 FR 3082), January 19, 2000. FR notices
promulgating CPG IV (69 FR 24028) and RMAN
IV (69 FR 24039), April 30, 2004. FR notices
promulgating CPG V (72 FR 52475) and RMAN
V (72 FR 52561), September 14, 2007.
Other Government
Sources
Federal Highway Administration (FHWA):
. With assistance from the
American Coal Ash Association, Inc., FHWA
published Fly Ash Facts for Highway Engineers
(FHWA-SA-94-081), August 1995. It also main-
tains a database of state specifications for using
coal fly ash and GGBF slag.
U.S. General Services Administration (GSA)
Environmental Products Overview: . GSA offers a variety of
environmental products and services to its federal
customers to assist them in their efforts to com-
ply with procurement responsibilities outlined in
federal environmental laws and regulations. This
overview contains information about environ-
mentally oriented products and services in the
Federal Supply Service Supply System. To access
GSA Advantage!, GSA's Internet-based ordering
system, and order any GSA product, visit .
Environmental Products Guide: . This
guide is designed to help procurement of-
ficials identify environmentally preferable
products and services. It features nearly
3,000 items, including many recycled-con-
tent products.
C O N S T R1l C T10 N P R O D U C T S
PAGE 7
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Office of the Federal Environmental Executive
(OFEE): . OFEE's mission is to
advocate, coordinate, and assist environmental
efforts of the federal community in waste preven-
tion, recycling, affirmative procurement of CPG
items, and the acquisition of recycled and envi-
ronmentally preferable products and services.
Greening the Government: A Guide to
Implementing Executive Order (E.O.) 13101:
. This guide
provides detailed information on the require-
ments of E.O. 13101, which established a
process for amending the CPG and issuing
RMANs. E.O. 13101 preceded E.O. 13423
and established many requirements and
definitions that are still in effect. Updated
in February 2001, the E.O. is available from
OFEE at .
Executive Order 13423: Strengthening
Federal Environmental, Energy, and Trans-
portation Management: . Published in January
2007, this Order replaced E.O. 13101 and
requires federal agencies to purchase green
products and services, including recycled-
content products, energy- and water-efficient
products, biobased products, and environ-
mentally preferable products and services.
Although E.O. 13423 revoked E.O. 13101,
EPA continues to follow certain procedures
of E.O. 13101 since they are consistent with
the requirements of RCRA 6002 (e).
Federal Green Purchasing Program: . This program assists
federal agencies to promote the acquisition
of recycled-content, environmentally pref-
erable, and biobased products; non-ozone
depleting substances; and products contain-
ing alternatives to certain priority chemicals.
The program also assists agencies to imple-
ment energy-related purchasing require-
ments, including the purchase of alternative
fuel vehicles and alternative fuels. Training
tools and other green purchasing guidance
are available.
Department of Energy (DOE) Building Technolo-
gies Program: .
DOE's Building Technologies Program works in
partnership with states, industry, and manufac-
turers to improve the energy efficiency of our
nation's buildings.
U.S. Army Corps of Engineers (USAGE): . USAGE has specifications for
cement containing coal fly ash.
Federal Trade Commission: . The Federal Trade
Commission issued Guides for the Use of Envi-
ronmental Marketing Claims in May 1998.
California Recycled-Content Product Database:
. This site contains
information on reasons for buying recycled-con-
tent products and how to procure them, and pro-
vides access to a database with information on
products, as well as manufacturers, distributors,
reprocessors, mills, and converters across the
country who procure or produce these products.
King County Recycled Product Procurement Pro-
gram: . This
site describes the tools and techniques developed
by King County, Washington, agencies for pur-
chasing recycled products.
Additional Sources
National Center for Appropriate Technology,
Center for Resourceful Building Technology:
. This site offers resources,
tools, links to articles and publications, and
community success stories on topics related to
green building elements of design, construction,
and maintenance. Includes examples.
The American Association of State Highway
and Transportation Officials (AASHTO): . AASHTO publishes concrete and cement-
mixing specifications, which are listed in a
resource guide and in RMAN I. The AASHTO
Publications Catalog provides information on all
AASHTO publications.
American Concrete Institute (ACI): . ACI publishes a standard for
concrete containing GGBF slag and offers several
relevant publications.
American Society for Testing and Materials
(ASTM): . ASTM publishes
standards for mixing cement and concrete.
Buy Recycled Business Alliance: . The Alliance includes over 3,200
companies and organizations committed to
increasing the use of recycled-content products
and materials in their day-to-day operations.
The Alliance offers educational materials,
a quarterly newsletter, and product-specific
'-'VJ
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guides. Publications include fact sheets on
insulation and coal fly ash, and Building for
Tomorrow: Buy Recycled Guidebook for the
Commercial Construction Industry. Public
purchasing entities can join free of charge.
The Recycled Materials Resource Center
(RMRC): . RMRC is a na-
tional center created to promote the wise use of
recycled materials (pavements, secondary waste,
byproduct materials) in the highway environ-
ment. The Center is a partnership with FHWA.
Directory of Recycled-Content Building and
Construction Products: .This
regional directory includes 500 construction
and building products manufactured partially or
totally from recycled materials.
Building Green, Inc: .
This independent publishing company produces
Environmental Building News, a monthly news-
letter on environmentally responsible design
and construction that includes articles on new
products and materials, technologies, and con-
struction methods.
Environmental Resource Guide: . Published by the American Institute of
Architects, this 1,100-page guide presents com-
prehensive lifecycle information on building
materials and applications, including products
and recyclability.
National Institute of Governmental Purchasing
(NIGP): . NIGP maintains a
library of product specifications and sample bid
documents for both virgin- and recycled-content
products, including concrete. It also offers pro-
curement training workshops for members.
Official Recycled Products Guide: . This
directory lists more than 5,000 manufacturers
and distributors of recycled-content products.
Recycled Plastic Products Source Book: . This booklet lists
more than 1,400 plastic products from approxi-
mately 300 manufacturers.
Resource Guide to Recycled-Content
Construction Products: .
This recycled-content construction products
list is available from the Los Angeles Integrated
Solid Waste Management Office.
Recycling Data Network Information Services:
. This
commercial Web site provides access, on a sub-
scription basis, to a recycled-content products
database of over 4,500 listings in 700 product
classifications. It also provides a reference library
and a newsletter. Managed by the publisher of the
Official Recycled Products Guide, the product
database is considered to be the largest of its kind.
Oikos Green Building Source: . This site contains a catalog of books, vid-
eos, and software for sustainable construction;
a searchable database of companies that feature
products with environmental attributes; and
links to other green building sites.
Sustainable Building Sources: . This site contains green building news
articles, conference announcements, links to
other green building sites, and the Sustainable
Building Sourcebook.
''A
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