CROSS LAMINATED TIMBER

Transcription

1 CROSS LAMINATED TIMBER Bridging the Designer-Manufacturer Gap Presented By: Allison Standiford April 25, 2017 Seattle Wood Solutions Fair Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board.

2 The Wood Products Council is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516. Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-aia members are available upon request. This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

3 COURSE DESCRIPTION This presentation is intended for building designers interested in the use of cross-laminated timber (CLT) who want to take full advantage of its prefabricated, precise nature and potential for construction savings. Unlike some traditional wood products, interaction with the product manufacturer, on elements such as 3D building models and whole building shop drawings, is important to the design of a successful CLT structure. Topics will include CLT design considerations, including those related to cost efficiency, as well as appropriate spans, thicknesses, applications, and specifications. The design team/manufacturer relationship will also be examined, with an emphasis on what project teams can expect from design through construction, information required by each party, and appropriate outputs (e.g., drawings, calculations, specs).

4 LEARNING OBJECTIVES 1. Explain best practices for designing a cross-laminated timber (CLT) building for cost efficiency, addressing items such as spans, thicknesses and specifications. 2. Demonstrate the typical interface between design team and CLT manufacturer on commercial and multi-family projects. 3. Highlight keys to successful CLT project delivery, from drawing coordination to material lead time. 4. Review methods of streamlining the design team s input on CLT projects, focusing on cost efficiency and schedule savings.

5 See Reference 1 Reach out to a manufacturer early and often Come prepared Understand the manufacturer s capabilities Help the manufacturer understand your needs

6 THE ORIGINAL INTENT OF CLT Lighter-weight replacement for concrete and steel Fully encased Inherent beauty of CLT See Reference 2 See Reference 3

7 WE ARE ALL UNIQUE Press size Product certification Wood species Layup options Strength values Ply and panel thickness Software Services See Reference 24

8 WHEN SHOULD I REACH OUT TO A MANUFACTURER? EARLY CONCEPTUAL DESIGN See Reference 3

9 YOUR PROJECT See Reference 5 What are you considering using CLT for? Floors? Walls? Roof? Elevator shafts? What will using CLT help you achieve? Time and labor savings? Aesthetics? Material cost savings?

10 PROJECT LOCATION Manufacturer location Shipping Logistics Labor force See Reference 7

11 PROJECT LOCATION Are you in a high seismic area? Tornado or hurricane prone area? Do you have heavy snow load to consider? See Reference 8 See Reference 10 See Reference 9 See Reference 11

12 CODE What building code is enforced in the jurisdiction of your project? Has CLT been used in your jurisdiction before? Are your code officials open to approving CLT? See Reference 12

13 ALTERNATE MEANS AND METHODS HOW? WHEN? See Reference 3 See Reference 3

14 ALTERNATE MEANS AND METHODS Star Mill: American Fork, Utah See Reference IBC jurisdiction CLT not outlined in the IBC SmartLam provided: Engineering review Panel design Calculations Shop drawings Connection details No deferred stamped submittal

15 ALTERNATE MEANS AND METHODS Tacoma Amtrak Roof- Tacoma, Washington See Reference 25 See Reference IBC & Alternative CLT layup Added 4 th layer of DF/L veneer Structural, certified 3 ply SPF-S Not a certified layup Confirmed with APA that this layup was permissible

16 PRODUCT CERTIFICATION What is PRG-320 and why is this important? Does your project require a product certification? What are the certified layups and what are they most commonly used for? What is the wood species of the manufacturer s certified product See Reference 3

17 ANSI/APA PRG-320 CERTIFIED LAYUPS 3 Ply ALT Concentrated strength in the long axis LIGHT BEARING AND NON-BEARING WALLS 4 Ply MAXX Equal strength in the both axes WALLS/SHORT FLOOR SPANS/TYPICAL ROOF SPANS 5 Ply ALT Concentrated strength in the long axis HEAVY BEARING WALLS/SHORT FLOOR SPANS/NORMAL ROOF SPANS 5 Ply MAXX Concentrated strength in the long axis SHORT FLOOR SPANS/NORMAL ROOF SPANS 7 Ply ALT Concentrated strength in the long axis LONGER FLOOR SPANS/LONGER ROOF SPANS 7 Ply MAXX Concentrated strength in the long axis LONGER FLOOR SPANS/LONGER ROOF SPANS 9 Ply ALT Concentrated strength in the long axis LONGEST FLOOR SPANS/LONGEST ROOF SPANS 9 Ply MAXX Concentrated strength in the long axis LONGEST FLOOR SPANS/LONGEST ROOF SPANS

18 FIRE What type of construction is your building? Residential? Commercial? Mixed use? What fire requirements will you need to meet? 1 hour or 2 hour ratings? Is a fire test or certification required? ASTM E119 or UL listing? Do you plan to leave the CLT exposed?

19 FIRE National Design Specification for Wood Construction 2015 Edition Chapter 16 CLT Design Handbook Chapter 8 Figure 7

20 See Reference 14

21 SOUND How do I reach the required STC or IIC ratings for my project? What testing has the manufacturer done that is specific to their product? What assembly is best for your project?

22 SOUND See Reference 17 Code minimum = Not less than 50, 45 if field tested Acceptable and Preferred Lab versus field testing Lab is typically 3-5 points higher than field testing

23 UNDERSTANDING CLT COST How do I get the most bang for my buck with CLT? Decide early that CLT is the system that will accomplish your project s goals Clean job site Fewer labor crews Faster schedule Ease of installation Foundation cost savings Reduced or eliminated soil improvement costs Visual aesthetic Use of sustainable materials Thermal performance value Energy efficiency

24 UNDERSTANDING CLT COST How do I get the most bang for my buck with CLT? (Cont.) Pick a manufacturer that checks all of your boxes qprg-320 certification qsfi Chain of Custody certified/fsc Chain of Custody certified qsound testing qfire testing qwood species qservices qlocation qlead time/availability to produce and deliver on your timeline Design for that manufacturer s most efficient panel size

25 UNDERSTANDING CLT COST We have to change the way we think about estimating, building and the cost model Understanding the building lifecycle costs as a whole rather than a cost per square foot Developer build and hold versus the build and flip model Each project is unique and will have cost parameters to investigate See Reference 27 See Reference 28 See Reference 29

26 EFFICIENCY AND COST Largest panel is a 10 x 40 panel Most efficient panel is a 10 x 40 panel Least efficient is a 6 x 21 panel See Reference 3 See Reference 3

27 EFFICIENCY AND COST 6 x x 40

28 PROJECT SPECIFICATIONS What is required from the manufacturer to comply? Is this a Buy America Act project? Living building challenge declared? LEED Certified, Silver, Gold, Platinum? Is FSC certification required? Will you accept SFI CoC certification? See Reference 19 See Reference 18 See Reference 20 See Reference 21

29 LEED POINTS WITH SFI CHAIN OF CUSTODY U.S. Green Building Council Alternate Compliance Path pilot program LEED 2009 LEED v4 Enables SFI certified wood and paper products to be eligible for LEED credit

30 LEED POINTS WITH SFI CHAIN OF CUSTODY SFI CHAIN OF CUSTODY In order to count toward a LEED point, the user must first know that: 100% of the forest products are from legal (non-controversial) sources 70% from responsible sources The remainder must be certified sources as evidenced by a chain of custody certification (CoC)

31 LEED POINTS WITH SFI CHAIN OF CUSTODY LEED v4 Sourcing of raw materials credit RESPONSIBLE EXTRACTION SOURCING CRITERIA Use at least 25% (based on cost) of permanently installed building materials that meet one of the following requirements: Extended Producer Responsibility (EPR) Bio-Based materials Reused Materials Wood Products- Sourced from certified sources (SFI CoC!)

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33 DESIGN PROCESS Specification section APA PRG-320 product report Engineering services/scope Connection details Panel design Shops review Design assistance Product samples Finish options, if any Lead time for production Lead time for delivery See Reference 3

34 DESIGN PROCESS Clearly identify deferred submittal requirements Dimensioned CLT plan Panel schedule Final CLT connection details Panel to panel Panel to other architectural and structural elements See Reference 3

35 DESIGN PROCESS What documents and file formats are best? Entire architectural and structural drawing set PDF REVIT files CAD files 3D model See Reference 3

36 SHOPS DEVELOPMENT Coordinating with other trades: Glulam manufacturer Steel fabricator Mechanical/Electrical/Plumbing Concrete- Extremely important! Concrete foundations must be square and level Contractor performs foundation survey As built dimensions See Reference 3

37 CNC MILLING Tolerances Capabilities See Reference 3 See Reference 3

38 SHIPPING & LOGISTICS See Reference 3 Legal load verses over-dimensional load Loading sequence & installation sequence Picking off of the truck or staging onsite Truck holding time Crane time

39 SHIPPING & LOGISTICS Manufacturer location Shipping Over-dimensional State escort fees Police escort fees See Reference 7

40 INSTALLATION Lifting hardware options Pick point placement calculations Reduced labor Speed onsite See Reference 3 See Reference 3 See Reference 3

41 CASE STUDIES: Transportation Center Transportation Center Main structure Walls, floors, roof, stair shafts, feature walls 191 total CLT panels Bus Canopy 44 CLT panels

42 CASE STUDIES: Transportation Center CHALLENGES: COMMUNICATION Manufacturer did not have direct line of contact to design team Buy America Act Transportation project Basis of design was Canadian U.S. manufacturer was brought in late 9 ply certified panel specified but not available in the U.S. at this time Foundation issues Wood species- Aesthetics See Reference 3

43 CASE STUDIES: Transportation Center RESULT: COMMUNICATION Multiple RFIs Extended Shops development phase Panel thicknesses APA certification Foundation Schedule delays See Reference 3

44 CASE STUDIES: Sliver Project, Tulsa Approx. 54,000 SF 8 Stories CLT floors, walls, roof Design team reached out to a specific manufacturer in early conceptual design Conducted an efficiency study based on the manufacturer s recommendations and capabilities Maximizing panel sizes minimizes press and CNC time See Reference 26

45 See Reference 26

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47 CONCLUSION Reach out to a manufacturer early and often Come prepared Understand the manufacturer s capabilities Help the manufacturer understand your needs See Reference 1

48 QUESTIONS? Allison Standiford Architectural Sales & Project Management SmartLam, LLC. (406) See Reference 24

49 REFERENCES s-tricks/&tbn id=otf_gh2bqjj4jm:&docid=icx5yiyca3v02m&h=400&w=800#h=400& imgrc=otf_gh2bqjj4jm:&w= Commerce/Brewery Lofts- Developed by Horizon Partners, FLYNN Architecture AWC-NDS2015-Vie wonly-1603.pdf (pg.152) 15. b_informationa l/dpd s pdf (chp.8, fig.7) My-Ti-Con Lifting Guide- Devloped by My-Ti-Con Timber Connectors Photo courtesy pf GarcoConstruction 25. Phot courtesy of David Stahl, Principal, Cunningham Group Architecture, Inc ld