- Shop drawing
A shop drawing is a drawing or set of drawings produced by the
contractor, supplier, manufacturer, subcontractor, or fabricator. Shop drawings are typically required for pre-fabricated components. Examples of these include: elevators, structural steel, trusses, pre-cast, windows, appliances, cabinets, air handling units,and millwork. Also critical are the installation and coordination shop drawings of the MEP trades of Divisions 15 and 16 such as sheet metal ductwork, piping, plumbing, fire protection, and electrical. Shop drawings are not produced by architectsand engineersunder their contract with the owner. The shop drawing is the manufacturer’s or the contractor’s drawn version of information shown in the construction documents. The shop drawing normally shows more detail than the construction documents. It is drawn to explain the fabricationand/or installation of the items to the manufacturer’s production crew or contractor's installation crews. The style of the shop drawing is usually very different from that of the architect’s drawing. The shop drawing’s primary emphasis is on the particular product or installation and excludes notationconcerning other products and installations, unless integration with the subject product is necessary. cite paper |author = R Pietroforte |title = Construction Management & Economics |publisher = Taylor & Francis | date = 1997 |url = http://taylorandfrancis.metapress.com/index/NK64AXLX9821K3M4.pdf | format =
Information required to be included in Shop Drawings
Comparison information for the architect and engineer
The shop drawings should include information for the architect and engineer to compare to the
specificationsand drawings. The shop drawing should address the appearance, performance, and prescriptivedescriptions in the specifications and construction drawings. cite paper |author= RM Crowder, W Hall, I Heath, R Bernard, D Gaskell |title= A hypermedia maintenance information system |version= |publisher= Computing & Control Engineering Journal |date= 1996 |url= http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=503166 |accessdate= 2007-02-23 ] The shop drawing often is more detailed than the information shown in the construction documents to give the architect and engineer the opportunity to review the fabricator’s versionof the product, prior to fabrication. References to the construction documents, drawings, and specifications assist the architect and engineer in their review of the shop drawings. Attachment of manufacturer’s material specifications, “catalog cut sheets,” and other manufacturer’s information may be helpful to accompany these drawings. Because shop drawings facilitate the architect’s and engineer’s approval of the product, they should be as clear and complete as possible.
Notes of changes or alterations from the construction documents
Notes concerning changes or differences from the original documents should be made on the shop drawing for the architect’s and engineer’s approval. Ultimately, they are responsible for changes in these drawings and should have the opportunity to analyze any modifications. A dialogue should occur between the fabricator and the architect and engineer about any areas needing clarification. Successful installations are the result of collaboration between the
designer, fabricator, and contractor.
Information needed to fabricate the product
Dimensions, manufacturing conventions, and special fabrication instructions should be included on the shop drawing. It should be clear to fabrication personnel what will be manufactured from the shop drawings alone. The construction documents are rarely used as a reference in fabrication, with the fabricators relying on the shop drawing for all information.
Indication of dimensions needing verification from the jobsite
Most jobsite dimensions, such as the dimensions between two surfaces on the jobsite, need to be verified. A dimension may be shown on the construction drawings, but the actual dimension may vary, from very small to large increments, depending on jobsite conditions. It is extremely important that the fabricated item arrive on the jobsite ready to be installed without field modification. Special care must be taken by the contractor to measure and verify dimensions. In new construction, plan dimensions usually are sufficient for ordering many fabricated items such as
structural steelor precast concrete.
remodelingand renovationwork, it is essential that field dimensions be verified prior to fabrication. Some fabricators, such as cabinetand casework suppliers, prefer not to rely on the contractor’s verification and will verify the dimensions with their own personnel.
Placement or installation information
Some fabricators and manufacturers will provide symbols, data, or instructions concerning installation. This can include a list of other materials, such as
fasteners or adhesives, appropriate but not included for the product.
Some fabrications will require a
sample submittalwith the shop drawing, primarily for colorand textureselection of finishes.
Because writing comments on eight to ten copies is a tedious process and an inefficient use of the architect and engineer's time, they will frequently specify other methods for distributing comments. Quick review is essential during the approval process. cite paper |author= S Shahid, T Froese |title= Project Management Information Control Systems |publisher= Canadian Journal of Civil Engineering |date= 1998 |url= http://article.pubs.nrc-cnrc.gc.ca/ppv/RPViewDoc?_handler_=HandleInitialGet&journal=cjce&volume=25&calyLang=fra&articleFile=l98-012.pdf |format=
Number of copies
Shop drawings are required, in various forms, depending upon the practice of the architect and engineer. A specific number of copies may be required by the specification. An example, distribution of the completed and corrected shop drawings may include the:
*Owner—file or inspection copy
*Architect—field copy or inspection copy
*Consulting engineer—file copy
*Consulting engineer—inspection copy
*Supplier—original copy or one copy
ubmittal of one or two copies of the shop drawing
Corrections are made by the architect and engineer, and the shop drawing is corrected by the supplier, then the appropriate number of copies is distributed. This method can be time consuming, as the shop drawing is not approved until the corrections are made on it.
ubmittal of a copy that can be reproduced
The architect and engineer make comments on the reproducible, then copies are distributed. This method facilitates the timely approval and distribution of the shop drawing. Review comments usually are obvious on the reproducible copy. When
sepiacopies are used, the reproduction of the sepia often is not as clear as a normal blue-line print.
Compatible CAD software
When the supplier and designer have compatible
CADsoftware, the review can be made from a CD or by email or FTP transfer. Comments can be made by the designer in a bold font or changes can be boxed for emphasis.
hop drawings in concrete reinforcing
Concrete reinforcing is one of the many items requiring specialized shop drawings for the fabrication of the material. Concrete reinforcing is custom-fabricated from 60-foot-long
reinforcing bars. cite paper |author= VKR Kodur |title= Performance-based fire resistance design of concrete-filled steel columns |publisher= Journal of Constructional Steel Research |date= 1999 |url= http://linkinghub.elsevier.com/retrieve/pii/S0143974X99000036 |accessdate= 2007-02-23 ] The reinforcing bars are cut to length and bent to specific configurations. The shop drawing and the accompanying “cut sheet” lists the quantity, sizes, lengths, and shapes of the reinforcing bar. This information is provided for review by the structural engineerto ensure that sufficient reinforcing is being supplied; fabrication of the bar by the supplier’s shop; an inventorylist for the contractor, upon delivery the typical project has thousands of pieces of reinforcing steel that need to be organized for storage and installation; and placement by the ironworker. The Concrete Reinforcing Steel Institute(CRSI) has developed standard symbols, graphics, and formats for shop drawings and cut sheets that generally are used by reinforcing steel fabricators. Each fabricator, has particular style for shop drawings and cut sheets, depending on the draftspeople and computer-aided drafting systems.
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