Flatness, Levelness, F-Numbers, Straightedge: What do the numbers mean? Recent changes to ACI 117 provide new procedures for straightedge measurements for floor slab flatness. Under the revised standard, 1/8 inch in 10 feet is not a standard option. Learn what each term means and how to specify floor slab tolerances in accordance with industry standards for each floor surface classification.

Visit our website at http://www.conspectusinc.com/publications.htm to view or download A1030-Floor Slab Flatness & Levelness 10.07.01.

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July News Bulletin

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This month Conspectus' News Bulletin highlights news about:

  • Modification of Contract Documents - methods and terms matter.
  • IBC 2009 Code Changes - selected highlights with substantial impact.
  • Electronic Construction Submittals - web-based project management advantages.
  • Submittal Lists - quickly checking the contractor's list.

Visit our website at http://www.conspectusinc.com/publications.htm to view or download the July News Bulletin.

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The July 1st CSI Specifying Practice Group meeting focused on how to collect project data required to write specifications. Group members Louis Medcalf, FCSI, CCS of Gresham, Smith & Partners and Patricia Gallup, RA, CSI, CCS of PSA-Dewberry, and group leader David Stutzman all shared examples of tools they have used and discussed the benefits of each. The sample documents will be available for download at the CSI blog. Here is a summary.

Louis Medcalf showed a table of Project Decisions by Phase. The table includes a column for pre-design, and each design phase for a construction project. Most interesting is the row in the table titled "Design Purpose." Each of the table entries relates directly to the phase purpose. And a goal is stated for some table entries at various design phases. Imagine the cost management goal for DD phase is to have sufficient information to establish a GMP. The corresponding construction information goal is to complete all product decisions affecting cost.

Noble goals, indeed! And consistent with the AIA Owner-Architect Agreement documents. Medcalf noted the table is used to help manage projects and the information that is created and documented at each phase. Stutzman interjected that recently it seemed that CD phase definition has changed. Instead of Construction Documents, it seems to be Continue Designing. Medcalf indicated delayed design decisions can be costly especially when significant design revisions are required as projects near completion.

Stutzman demonstrated a project table of contents in Microsoft Excel format that Conspectus creates when proposals are issued and then refines as projects progress through design. The table of contents includes a description of what is believed to be included in each spec section. Additional information, such as that found in basis of design documents, is included in separate columns as it become available. The file is distributed to the architects with notes about what data they must furnish. The architects use a separate column to respond to comments and questions and to add product selection data. The contents is a master document that uses Excel's auto filter function to quickly "edit" the file to show only the subject that are appropriate, without deleting any information.

Patricia Gallup showed a checklist in Microsoft Excel format that she uses with PSA-Dewberry's project architects. She explained the form is 21 pages long, and there are many selections to be made to complete the form. She has used the form successfully as a starting point to begin drafting the specifications. However, Patricia did report there is some reluctance to completing the form. Patricia is considering revising the form so it can be completed more efficiently as an electronic document.

Stutzman demonstrated a second checklist using Microsoft Word. The checklist was created for a client that builds a single building type at many locations. The file is actually a form using checkboxes, fill-in-the-blanks and drop-down menus added to the file using the Forms toolbar. The owner required the project architects to complete the checklist electronically. Having the owner make the demand of the architects ensured the form was completed for every project. Once completed, a macro is used to compare the form to the default status. Changes the architects make are displayed as red text to ensure the changes are easily found. This allows the client's standard specifications to be edited quickly to mach the checklist.

There seems to be no single answer to the question of how to collect project data or what tools to use. There are multiple approaches and various degrees of success. The right approach seems to depend on project circumstances, the people involved, and how much influence the specifier can exert.

Join your colleagues in discussing current issues by joining the Specifying Practice Group. The group meets the first Thursday of each month from 3:00 - 4:00 PM eastern time. The group meeting topics are for everyone who must read or write construction specifications.
Metal Studs: Smooth, Dimpled, and High Performance. Must you choose? Recent innovations in the design and manufacturing of steel studs have produced studs that use less steel yet perform as well and better than traditional smooth-faced studs. Learn how to specify these new studs because minimum metal thickness is no longer a valid measure.

Visit our website at http://www.conspectusinc.com/publications.htm to view or download C1010-Dimpled Studs 10.06.01.

Share your opinions and comments about this month's Tech Tips, by leaving a comment, here.
What do you use to describe your design projects? Will owners, lenders, estimators and others understand the design intent? Traditional methods rely on design narratives and outline specs to supplement drawings. Each design team develops their own method for presenting the written information. As a result, sharing the information among various teams and building a library of design descriptions for use with future work is difficult.

Louis Medcalf, FCSI, CCS and Chair of the CSI PPDFormat Task Team explained to the CSI Specifying Practice Group how Preliminary Project Descriptions (PPD) can simplify collecting and sharing information for the benefit of current and future project teams.

The CSI Specifying Practice Group meets the first Thursday each month. Everyone that reads or writes specifications is welcome to join the group and share ideas.

PPDs are not widely known nor widely used even though the concept first appeared in the CSI Manual of Practice in 1989. CSI created the PPD Task Team in 2009 to write a new publication to describe how to prepare PPDs. As a result, PPDFormat was published in May 2010 and is available from CSI. Now the industry has a guideline to help structure PPDs and the information they contain.

The PPD structure provides a systematic checklist to help ensure all the appropriate subjects are discussed. The checklist is UniFormat, the construction classification system for building systems and assemblies. UniFormat was designed for cost estimating. So, PPDs are coordinated with published cost estimating systems, allowing parallel presentation of design data and cost data.

The PPD structure allows each system and assembly to be discussed by description, function, and component. This structure enables analysis and effective comparison of various building systems used to perform the same function. Multiple solutions may be presented as potential design options without the need to show each system graphically. This approach allows options to be analyzed for aesthetics, life-cycle costs, durability, and other factors without investing significant time to document each option.

Documenting all information in a building model is not practical. PPDs provide the opportunity to describe what is required for each assembly that is represented by a model object without inserting the data into the model. Model the major building elements and rely on PPDs to describe the secondary and accessory components that complete the major assembly.

PPDs are useful at every project design phase. They can serve as the Schematic Design project report, the Design Development outline spec, and the Construction Documents quality control tool. They can record the decisions, the rationale, and the design at each step during the process. PPDs are a valuable resource throughout all stages of the design process.

Read the meeting notes and view the PowerPoint presentation slides at the CSI Blog.

http://blog.csinet.org/default.asp?Display=216

Here is an excellent resource article for architects and specifiers that explains the IBC 2009 code requirements for fire extinguishers - how to select, how to locate, and how many are required. Thanks to CSI for posting this thorough document.

What is an AW60 window and how will it perform? The window performance classes and performance grades set by the North American Fenestration Standard provide a simplified method for specifying the minimum performance for air infiltration, water penetration, and structural capacity. Learn what the ratings mean to specify the correct window performance for projects.

Visit our website at http://www.conspectusinc.com/publications.htm to view or download B2020-Exterior Window Ratings 10.05.01.

Share your opinions and comments about this month's Tech Tips, by leaving a comment, here.

Chapter 26 of the IBC 2006 building code requires foam insulations used inside the building weather barrier to be protected by a thermal barrier. The code defines thermal barriers as 1/2 inch thick gypsum wallboard or equivalent to limit the temperature rise to prevent ignition of the foam insulation for 15 minutes. Providing a continuous thermal barrier is sometimes difficult. The plane of the interior face of exterior walls is often interrupted by columns, beams, girts, and other obstacles.

Recently a contractor, through a substitution process, introduced us to Staycell 255 manufactured by Preferred Solutions, Inc. This polyurethane spray foam product can be installed on the building interior and left exposed. No need for a thermal barrier. The product was tested according to UL 1715 full-scale room fire test to meet an alternative compliance permitted by the IBC. The product can be applied up to 4 inches thick on walls and 8 inches thick on ceilings.

This product will provide an efficient solution for insulating the inside face of precast concrete exterior wall panels. The closed cell foam insulation will also serve as an air barrier and will serve as a vapor retarder when installed at least 2.5 inches thick.

Air Barriers

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What functions must an air barrier perform? It may be more than the obvious. Learn about the types, functions, performance, difficulties, and details for air barriers to be effective. Air barriers must be carefully selected to provide the correct expected performance. Carefully crafted details and specifications are required to ensure expectations are met by the installed assembly.

Visit our website at http://www.conspectusinc.com/publications.htm to view or download B2010-Air Barriers 10.04.01. Each Tech Tips file is titled using the UniFormat system and assembly designation to facilitate filing and future reference.

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Specifying Process

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Who is involved? What roles do they play? What contributions do they make? And when do each contribute? The CSI Specifying Practice Group explored these and other questions about the specifying process at the April 1, 2010 meeting.

 

If you have an opinion, join the group. Everyone that reads or writes specs is welcome and it is FREE. Participation, controversy, and disagreement are encouraged so we can learn from one another. The group meets for one hour the first Thursday of every month.

 

The perception is that architects and engineers make the product selections. Is the perception reality? Perhaps. But there are thousands of choices to make, and many factors influencing those choices. Architects tend to focus on products affecting the visual and spatial experience of the project. Mundane and commodity products receive scarce attention, if any. So, who makes those decisions?

 

Explore the meeting discussion presentation. Add your own opinions by leaving a comment at the end of this posting.



Owners may have significant influence on product selections and what is ultimately specified. Because of other facilities and maintenance experiences, owners tend to have strong opinions, especially about products that have not performed well. Poor performance and failures tend to generate design standards that must be met for future construction projects.

 

Specifiers, whether independent or in-house, exert a great deal of influence on product specifications. Specifiers usually keep the corporate memory of what works and what does not. The specifications reflect the memory and the designers' selections. The mundane products, ignored by the designers, are relegated to the specifier.

 

Contractors and subcontractors buy the products. Forcing builders to buy outside their normal supply chain will exert pressure on the designers to review substitution requests. And when builders can show owners significant first cost savings, those pressures mount.

 

Manufacturers, Distributors, and Product Representatives can play a significant role in influencing product specifications for construction project. This group works with the designers during the early stages of the project showing potential product applications and offering advice on product selections. The same group also influences the builders' product selection process during bidding and construction, especially when delivery times become critical.

 

So there are many players with changing roles depending on where the project is in the design and construction process.

 

Read additional notes about the meeting and listen to the meeting recording at the CSI Blog.