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Red-I™ joists
RedBuilt is often the first choice of architects, engineers, contractors and building owners on a diverse array of projects. One of many reasons is our engineered wood Red-I joists are suitable for a wide variety of commercial and industrial applications where design efficiency, installation cost, labor savings and aesthetics are primary considerations.
With uniform and predictable strength, Red-I joists can carry heavy loads over long spans while using wood economically. Manufactured to resist twisting, bowing and shrinking, and trimmable on the job site, they’re engineered to provide faster installation times, which cuts down on labor costs. Plus, they’re pre-punched with knock out holes for convenient wiring and LVL flanges are easily nailed, unlike some alternative materials.
| FLANGE DIMENSIONS
(h x w) |
WEB (OSB) | AVAILABLE DEPTHS | SPECIAL CONSIDERATIONS | |
|---|---|---|---|---|
| Red-I™ 45 | 1 1/2” x 1 3/4” | 3/8” | 9 1/2” - 16” | |
| Red-I™ 65 | 1 1/2” x 2 1/2” | 7/16” | 11 7/8” - 30” | |
| Red-I™ 65T | 1 1/2” x 2 1/2” | 7/16” | 9-1/2” - 30” depending on slope |
Tapered |
| Red-I™ 90 | 1 1/2” x 3 1/2” | 7/16” | 11 7/8” - 30” | |
| Red-I™ 90H | 1 3/4” x 3 1/2” | 7/16” | 11 7/8” - 30” | |
| Red-I™ 90HS | 2 1/2” x 3 1/2” | 1/2” | 11 7/8” - 32” | For heavy loads and 8’ on-center roof systems. Provides increased bending strength and stiffness |
Red-I DTL 25 Sound Isolation Detail 4
232kb DWG Updated Aug 2025 Download DWG
21kb PDF Updated Aug 2025 Download PDF
Red-I DTL 24 Sound Isolation Detail 3
234kb DWG Updated Aug 2025 Download DWG
19kb PDF Updated Aug 2025 Download PDF
Red-I DTL 23 Sound Isolation Detail 2
240kb DWG Updated Aug 2025 Download DWG
23kb PDF Updated Aug 2025 Download PDF
Red-I DTL 22 Sound Isolation Detail 1
137kb DWG Updated Aug 2025 Download DWG
27kb PDF Updated Aug 2025 Download PDF
Red-I DTL 21 Wind/Seismic Connections Wall Tension Tie — HD Connections
365kb DWG Updated Aug 2025 Download DWG
19kb PDF Updated Aug 2025 Download PDF
Red-I DTL 20 Wind/Seismic Connections Tie at Butting Joists
312kb DWG Updated Aug 2025 Download DWG
14kb PDF Updated Aug 2025 Download PDF
Red-I DTL 19 Wind/Seismic Connections Wall Tension Tie With Straps
295kb DWG Updated Aug 2025 Download DWG
14kb PDF Updated Aug 2025 Download PDF
Red-I DTL 18 Roof Details – Bevel Cut or Fire Cut
102kb DWG Updated Aug 2025 Download DWG
9kb PDF Updated Aug 2025 Download PDF
Red-I DTL 17 Roof Details – Cantilever with Mansard Framing
109kb DWG Updated Aug 2025 Download DWG
10kb PDF Updated Aug 2025 Download PDF
Red-I DTL 16 Roof Details – Ridge
288kb DWG Updated Aug 2025 Download DWG
15kb PDF Updated Aug 2025 Download PDF
Red-I DTL 15 Roof Details – Beveled Plate Requirements
103kb DWG Updated Aug 2025 Download DWG
10kb PDF Updated Aug 2025 Download PDF
Red-I DTL 14 Roof Details – Slope at High End
222kb DWG Updated Aug 2025 Download DWG
10kb PDF Updated Aug 2025 Download PDF
Red-I DTL 13 Roof Details – Slope
233kb DWG Updated Aug 2025 Download DWG
11kb PDF Updated Aug 2025 Download PDF
Red-I DTL 12b Outriggers (Available as Plant-Assembled)
301kb DWG Updated Aug 2025 Download DWG
17kb PDF Updated Aug 2025 Download PDF
Red-I DTL 12a Cantilevers (Field-Assembled Only)
305kb DWG Updated Aug 2025 Download DWG
18kb PDF Updated Aug 2025 Download PDF
Red-I DTL 11 Red-I™ Joist Cantilever
232kb DWG Updated Aug 2025 Download DWG
12kb PDF Updated Aug 2025 Download PDF
Red-I DTL 10 Floor Details Top-Loaded Double Joist
273kb DWG Updated Aug 2025 Download DWG
12kb PDF Updated Aug 2025 Download PDF
Red-I DTL 9 Floor Details Support Detail (For Loads Exceeding 250 lb)
347kb DWG Updated Aug 2025 Download DWG
19kb PDF Updated Aug 2025 Download PDF
Red-I DTL 8 Floor Details Side-Loaded Double Joist (Header Location)
312kb DWG Updated Aug 2025 Download DWG
15kb PDF Updated Aug 2025 Download PDF
Red-I DTL 7 Floor Details Side-Loaded Double Joist (Ladder Framing)
299kb DWG Updated Aug 2025 Download DWG
15kb PDF Updated Aug 2025 Download PDF
Red-I DTL 6 Floor Details Hanger on Masonry Wall
266kb DWG Updated Aug 2025 Download DWG
15kb PDF Updated Aug 2025 Download PDF
Red-I DTL 5 Floor Details Hanger on Steel Beam
331kb DWG Updated Aug 2025 Download DWG
17kb PDF Updated Aug 2025 Download PDF
Red-I DTL 4 Floor Details Hanger on Beam
282kb DWG Updated Aug 2025 Download DWG
15kb PDF Updated Aug 2025 Download PDF
Red-I DTL 3 Floor Details Hanger on Ledger
316kb DWG Updated Aug 2025 Download DWG
20kb PDF Updated Aug 2025 Download PDF
Red-I DTL 2 Floor Details Hanger on Stud Wall
293kb DWG Updated Aug 2025 Download DWG
14kb PDF Updated Aug 2025 Download PDF
Red-I DTL 1 Floor Details Nailing Red-I™ Joist to Bearing Plate
123kb DWG Updated Aug 2025 Download DWG
16kb PDF Updated Aug 2025 Download PDF
Total Support Brochure
57317kb PDF Updated Mar 2020 Download PDF
Red-I45L and Red-I58 Joists in Residential/Multi-Family Applications (TB-200)
253kb PDF Updated Oct 2014 Download PDF
Fire Facts Guide
2801kb PDF Updated Jun 2016 Download PDF
Red-I™ Joists (for Canada)
1313kb PDF Updated Aug 2023 Download PDF
Red-I™ Joists
2080kb PDF Updated Nov 2023 Download PDF
Forming and Shoring Product Selector
4626kb PDF Updated Oct 2020 Download PDF
Sprinkler System Installation Guide
5773kb PDF Updated Jan 2016 Download PDF
Tapered Red-I65T™ Joists
6857kb PDF Updated Mar 2018 Download PDF
Red-I™ Joist Installation Information
1636kb PDF Updated Dec 2023 Download PDF
Red-I™ Joist Installation Information (Metric)
684kb PDF Updated Apr 2022 Download PDF
Red-I™ Joist Installation Information (Spanish)
1135kb PDF Updated Apr 2022 Download PDF
Sprinkler System Installation Guide
5773kb PDF Updated Jan 2016 Download PDF
SFI® Chain of Custody Certificate for Red-I™ Joists and RedLam™ LVL
283kb PDF Updated Oct 2023 Download PDF
PFS-TECO Listed Fire-Rated Assemblies
No files found
Intertek Listed Fire-Rated Assemblies
No files found
Health Product Declaration (HPD) – RedBuilt Red-I™ Joists
413kb PDF Updated Feb 2023 Download PDF
Parapet Assemblies (TB-400)
656kb PDF Updated Jan 2022 Download PDF
Red-I45L and Red-I58 Joists in Residential/Multi-Family Applications (TB-200)
253kb PDF Updated Oct 2014 Download PDF
RedBuilt™ Red-I™ I-Joist Specification – Canada
15kb DOCM Download DOCM
RedBuilt™ Red-I™ I-Joist Specification – U.S.
64kb DOC Download DOC
RedSpec™ Product Sizing Software Brochure
369kb PDF Updated Aug 2014 Download PDF
Environmental Product Declaration (EPD) – RedBuilt Red-I™ Joists
1376kb PDF Updated Dec 2021 Download PDF
Fire Facts Guide
2801kb PDF Updated Jun 2016 Download PDF
FloorChoice™ Floor Performance
2061kb PDF Updated Jun 2010 Download PDF
Red-I™ Joists (for Canada)
1313kb PDF Updated Aug 2023 Download PDF
Red-I™ Joists
2080kb PDF Updated Nov 2023 Download PDF
Forming and Shoring Product Selector
4626kb PDF Updated Oct 2020 Download PDF
Sprinkler System Installation Guide
5773kb PDF Updated Jan 2016 Download PDF
Tapered Red-I65T™ Joists
6857kb PDF Updated Mar 2018 Download PDF
SFI® Chain of Custody Certificate for Red-I™ Joists and RedLam™ LVL
283kb PDF Updated Oct 2023 Download PDF
Health Product Declaration (HPD) – RedBuilt Red-I™ Joists
413kb PDF Updated Feb 2023 Download PDF
Red-I™ I-Joist (SDS)
425kb PDF Download PDF
Wood Dust (SDS)
406kb PDF Download PDF
Green Building Solutions Q&A
151kb PDF Updated May 2024 Download PDF
Environmental Product Declaration (EPD) – RedBuilt Red-I™ Joists
1376kb PDF Updated Dec 2021 Download PDF
RED-I™ TAPERED I-JOISTS
1064kb RFA Updated Feb 2021 Download RFA
RED-I™ I-JOISTS
637kb ZIP Updated Feb 2021 Download ZIP
PFS-TECO Listed Fire-Rated Assemblies
No files found
Intertek Listed Fire-Rated Assemblies
No files found
ICC-ES Report ESR-2994 with LABC Supplement: Red-I™ Prefabricated Wood I-Joists
No files found
CCMC 13487-R: Red-I™ Prefabricated Wood I-Joists (Red-I45, I65, I90 and I90H)
No files found
PFS-TECO Listed Fire-Rated Assemblies
No files found
Intertek Listed Fire-Rated Assemblies
No files found
Fire Facts Guide
2801kb PDF Updated Jun 2016 Download PDF
Sprinkler System Installation Guide
5773kb PDF Updated Jan 2016 Download PDF
ICC-ES Report ESR-2994 with LABC Supplement: Red-I™ Prefabricated Wood I-Joists
No files found
RedBuilt™ Product Warranty Letter
325kb PDF Updated Aug 2025 Download PDF
Product Warranty Certificate
796kb PDF Updated Aug 2025 Download PDF
Secondary Treatments (TB-300)
123kb PDF Updated Mar 2016 Download PDF
Parapet Assemblies (TB-400)
656kb PDF Updated Jan 2022 Download PDF
Red-I45L and Red-I58 Joists in Residential/Multi-Family Applications (TB-200)
253kb PDF Updated Oct 2014 Download PDF
RedSpec™ Product Sizing Software Brochure
369kb PDF Updated Aug 2014 Download PDF
FloorChoice™ Floor Performance
2061kb PDF Updated Jun 2010 Download PDF
Red-I™ I-Joist (SDS)
425kb PDF Download PDF
Wood Dust (SDS)
406kb PDF Download PDF
Fabricator Certificate – City of Los Angeles, RedLam LVL & Red-I Joists
415kb PDF Updated Jul 2025 Download PDF
Fabricator Certificate – City of Houston, Open-Web Trusses, RedLam LVL & Red-I Joists
514kb PDF Updated Nov 2024 Download PDF
Japanese Approval – Article 37 – Red-I45™
1674kb PDF Download PDF
Japanese Approval – Article 37 – Red-I65™
1187kb PDF Download PDF
Japanese Approval – Article 37 – Red-I90™
1184kb PDF Download PDF
Japanese Approval – Article 37 – Red-I53™/Red-I58™
585kb PDF Download PDF
Fabricator Certificate – City of Seattle, Red-I Joists
234kb PDF Updated Jun 2025 Download PDF