Sacramento Area Office: (916) 772-3600 San_Francisco Area Office: (707) 578.3600 Los_Angeles Office: (949) 260.3600 Phoenix_Office (855) 705-3600

Building Envelope/Waterproofing

Construction Specifications

QC Peer/Constructability Reviews

Forensic Investigations


Let Us bring "Added Value" to your Project Team...

Our Team

DTR Staff Appreciation Day

DTR take Value in our Staff & Clients…

We believe in working hard, playing hard as a team and as a FIrm, are blessed with some pretty incredible Clients and Projects.

Our Firm's unofficial motto is "Make your Architect Look Good, and Allow them to be Profitable". Words that are ingrained in everything we do.

DTR has provided our A/E Clients, across the globe, various technical design services (such as Building Envelope, Construction Specifications, Peer Reviews, assist Designers in Product Selections, etc) on more than $6.2B in new & renovated projects, including more than 47 LEED Certified structures.

We provide technical design services to Architects, Engineers & Design/ Build Contractors to assist in top quality design, project drawings and development of clear, concise and defendable specifications, including selection of appropriate building materials. We are a resource group assisting your Firm in the development of construction techniques and documentation which is suitable to your project, including providing technical solutions for waterproofing, roofing solutions and field assessments.

Our staff is also skilled in the field during the construction phase, both observing and enforcing installation and testing requirements, PLUS construction resolution assistance and if need be, forensic evidence gathering....


May 2014

Design Matters

What Really Gets Built?

Glass Wall Panels

Design Professionals expend a lot of time & creativity in the design stages of a project presenting programs, space plans, perspectives, illustrations, full colored prints, renderings and 3D models that represent Design Solutions to their clients. Early in the project, everyone is happy.

The construction phase begins; sometimes the longest phase of the pre-occupancy cycle. Soon after ground breaking, things become more intense for your client. RFI's start pouring in and products submitted are not what the Designer intended. Additional clarifications, supplemental instructions and Change Order Requests ensue. The Owner just wants the project completed on time.

Suddenly, not everyone is happy. You are battling requests for change orders, the contractor is requesting more time, different products are being submitted, your staff is expending excess time on the project and the Owner's Representative has to face his Board with unpleasant news.

Two years into the Owners occupancy you are still working on closeout issues. The building is leaking, condensation is occuring on the underside of the roof joists, inside on the curtain wall or within the wall cavities. Now what...

We can assist your firm early with Quality Control/Peer Reviews, Building Envelop Design Assistance and Field Observation of installation and testing, plus other Technical Services to minimize potential grief, protect your Firm profits throughout your project and keep your Client happy…

September 2013

DTR Expertise

DTR Highrise Project

DTR has written a series of articles, assembled short presentations and present national webinars which we enjoy sharing with our Clients.  The intent of these presentations is to learn from each other and grow from the experiences of others.

Many things we LEARN from the multitude of projects DTR Consulting Services has worked on throughout the years, give us great insight, which we desire to share with our Clients.

Webinars & Presentations

DTR is scheduled to present 12 national webinars & Presentations this year. As an expert in the industry, we are routinely invited to present material applicable to Architects, Engineers, Manufacturers and Contractors. Most of our webinars have 200 to 300 paid attendees. See our "Articles & Seminar" page for upcoming Webinars.


DTR authors papers, blogs and industry newsletter articles throughout the year. There are many changes within the building industry, and we are more than happy to summarize those changes and weigh new requirements against good building practices. Hope you enjoy our insight…


May 2014

International Projects


NEW L.A. Area Office Location

Golden Gate Bridge photo


DTR Consulting Services has moved our Los Angeles Area Office to better serve our A/E Clients in the Southern California area. The new location provides for future growth and easier access to area freeways.

Overseeing this office is the Firm’s Managing Principal, Thomas Berger, RCI, CSI, CDT, SCIP.   In addition to running the new Phoenix Area Office, he is overseeing the expansion of this office.  DTR Consulting Services continues to work with Architectural and Engineering Clients in the Los Angeles, Orange County and San Diego Area since early 2006.  This move allows DTR to build on our current client base and to expand our Firm to better serve our current and future A/E Clients.

Tom will be evaluating and recruiting the best new staff, the area has available.  He will be in charge coaching new staff members into the existing DTR Culture and provide training for both experienced and junior members in the DTR approach to serving our Architectural Clients. DTR will be looking to hire both Building Envelope Engineers, Specifiers and Quality Control Staff.

Michelson Dr

Please help us Celebrate this new Office Location…


Updated: Sept 2013

Let us bring "Added Value" to your Project Team...

©2011, DTR Consulting Services, Inc., All rights reserved.

By: John Guill, AIA, CSI, CCS, CCCA, SCIP

Marcus Vitruvis

Design Effects of Roof Edges by Recent Code Changes

Changes to Building Codes rarely have identifiable effects on expressions of the building’s appearance, but recent changes to California Building Code 2010, Chapter 15 may affect the appearance of the roof line as the boundary of a plane.

One of the signatures of the Modern Movement in Architecture is the flat roof.  Known technically as Low-Slope Roofs, improvements in construction technology and new perceptions of style enabled expression of the building form as pure prisms, unaffected by pitch or texture.  Roofs disappeared behind parapets protected by thin, metal caps, emphasizing modern horizontal lines. Flat roofs no longer required bulky fascia, but hovered weightless above ribbons of glazing.

Designers’ efforts to express these linear elements often focus on the metal caps and edges, seeking to minimize foreign intrusion on the purity of form.  Of course, caps and edge metal can not be eliminated, as the edges, intersections and corners are the part of the geometry most in need of protection from the weather. Various industry groups have standardized installation practices and provide details that architects and installers can jointly reference for termination and transition of roof planes while keeping the elements at bay.  Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA), Copper Development Association (CDA) and National Roofing Contractors’ Association (NRCA) have extensive suites of (slightly different) details and recommendations.

The American National Standards Institute (ANSI) and the Single Ply Roofing Institute (SPRI) have collaborated on a design method for edge securement of membrane roofing called ANSI/SPRI ES-1.  The document establishes standards for materials, design, anchorage design and load calculation for metal roof edges and copings and introduces three tests for durability and quality of wind resistance; Outward Force, Edge Anchorage, and Uplift.

New language in CBC 1504.5 “Edge Securement for Low-Slope Roofs” now mandates use of products tested for wind resistance in accordance with ANSI/SPRI ES-1, as modified by the Code and makes many familiar details obsolete or unacceptable. 

Field-fabricated or custom shapes cannot be easily or economically tested, local fabricators are unlikely to embark on expensive testing programs, particularly for custom or “one-off” designs.  At the time of this writing, SMACNA and CDA do not have authorized fabricators or testing programs for their respective standard details.  Many “Standard Details” in the industry repertoire are now obsolete for code compliance.  NRCA does have a testing program for certain standard details and authorized fabricators who can produce them.
It would be simple if CBC 2010 adopted the ANSI/SPRI ES-1 methodology directly, but that is not what happened.  Instead, structural loads used for design must be determined according to CBC Chapter 16, not the tables included in the ANSI/SPRI standard.  Also, the CBC definition of exposure categories differs from that of ANSI/SPRI.  Thus, specification and use of flashing tested and certified to ANSI/SPRI ES-1 still may not result in CBC code compliant installation.

Architects designing low-slope roofs subject to CBC 2010 1504.5 must now prepare engineering calculations demonstrating wind load resistance to the standards of that code, and specify only ANSI/SPRI ES-1 authorized flashings.  The ability to design a custom appearance may no longer be possible for small or low-budget projects.  This is a definite change to the visual design potential for the roof edge line.


Understanding ANSI/SPRI ES-1 by Mark S. Graham, Professional Roofing Magazine, October 2009.
Wind Resistance of Custom Roof Edge Flashing by Tim Werbstein, ARCOM Newsletter, 2010.


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