Recently in Properties Sets Category

Last week I attended the Ecobuild America conference held in Washington DC. As you might expect from the name, the conference focus is on sustainable design. However there is also a strong emphasis on BIM and specifications because of the influence of National Institute of Building Science (NIBS), buildingSMART alliance, and Specifications Consultants in Independent Practice (SCIP).

The prominent specifications discussion centered on SPie, the Specifier's Properties Information Exchange. This is a product of a joint effort led by the Construction Specifications Institute (CSI) and SCIP. The project was funded through a grant from the US Army Corps of Engineers. The goal of the project was to define the minimum property sets for building model objects with consistent defined materials, products, equipment, and assemblies.

The project resulted in an extensive list of properties for over 400 specification sections. The properties represent the common applications, sustainability requirements, basic materials, and options that are required to specify products for construction projects. The hope is that manufacturers will use the property sets to organize their product data so the data can be transformed into an IFC (industry foundation class) file capable of being used by modeling software to describe the product as a BIM object.

The property sets are available in an on-line searchable database. The searches can be completed by MasterFormat™ 2004 specification section number, UniFormat™ assembly number, title, or property. The property sets for each specification section number offer a good list of the common choices that designers must make and that specifiers must incorporate into construction specifications.

Good luck trying to find the Specifier's Properties Information Exchange on the NIBS Whole Building Design Guide (WBDG) website. The page is not available from the navigation menu or site map. However, it is available on WBDG's site at http://www.wbdg.org/references/pg_spt.php, found through search engines using "specifiers property set" as the search term. Let's hope that NIBS corrects the website navigation menus and site map to show the links to the ProductGuide page.

Here is an example of the property sets. This set is for flush wood doors specified in Section 081416. The properties listed are not the complete set needed to describe factors affecting wood door specifications. Veneer cut, veneer leaf matching, and door face matching can greatly affect material waste and consequently door cost. Additionally, the door core construction may be implied by fire resistance ratings and certified materials, but options are still available that will affect durability and cost. Not shown in the example values are two common values included for each property: "Other" and "Not Defined." These additional values are available choices when manufacturers complete the property sets for their products.

As these property sets are used, I expect they will be refined as the manufacturers begin to identify the salient properties of each class of product. I believe the intent will be to avoid properties that are entirely proprietary due to the open nature of the buildingSMART alliance projects. Meanwhile, I applaud all the participants that contributed to creating the property sets. And I encourage manufacturers to begin developing their input for the property sets to generate the industry needed IFC files supporting BIM objects.