AJS Joists

Strength and Consistency You Can Count On

An easy-to-install solution for high-performance floors and roofs available throughout the Northeastern US and Eastern Canada.

Product Overview

AJS® Joists have solid-sawn flanges, made with proprietary MSR (machine stress rated) graded lumber to help ensure the strength and consistency you can count on. The proven web stock and approved structural adhesives provide quality, high-performance floor and roof systems at a cost-competitive with traditional construction materials. With six series available, this complete line of products is well-suited for your next home, multifamily, and light commercial project.

Available in six series: (2 ½″ flange) 140, 150, 20, 190, and deep depth (3 ½″ flange) 25 and 30.

AJS Joist Benefits

  • Solid lumber flanges for quick installation
  • Lightweight for easier handling
  • Consistency helps keeps floors flat
  • Holes allowed in web
  • Forest-friendly sustainability

Available Depths:

  • 9 ½″
  • 11 ⅞″
  • 14″
  • 16″

Deeper Depths – AJS 25 and AJS 30

  • 18″
  • 20″
  • 22″
  • 24″

High Performance Results

AJS Joists’ longer lengths mean simpler floor/roof layouts and higher floor performance. Plus, AJS joists are consistent from piece to piece, helping to keep floors flat and quiet making customers happy.

Easy Installation
AJS Joists are lightweight and feature solid lumber flange for easy handling and installation. The joists’ 1-1/2″ pre-stamped knockouts and allowances for on-site hole cutting provide for easy routing of wiring, HVAC, and plumbing through the web, speeding construction and reducing labor costs.

All AJS Joists are field trimmable without the need for special tools or skills, and eased edges mean fewer splinters on the job.

Product Literature

TitleResource TypeShareresource-category_hfilterregion_hfilter
VAR-1017 AJS I-joist Code ReportCode ReportViewcode-reportus-east us-west canada-east canada-west
ESR-1144 ALLJoist® Code ReportCode ReportViewcode-reportus-east us-west canada-east canada-west
CCMC 12787E ALLJoist® English Code ReportCode ReportViewcode-reportcanada-east
CCMC 12787F ALLJoist® French Code ReportCode ReportViewcode-reportcanada-east
AJS I-joist Commerical Guide – MTP-E7610Multi-Fam/Light CommViewmflcus-east canada-east
Deep Depth Boise Cascade AJS Joists (MFLC) – JOI-E1603Multi-Fam/Light CommViewmflcus-east us-west canada-east canada-west
Canadian AJS I-joist Multi-Family / Commercial Spec Guide – MTP-CE7610Multi-Fam/Light CommViewmflccanada-east
AJS I-joist Specifier’s Guide – MTP-E7600*Popular, Product / Specifier GuideViewaa-popular product-specifier-guideus-east
AJS I-joist 24 Product GuideProduct / Specifier GuideViewproduct-specifier-guideus-east us-west canada-east canada-west
Guide du concepteur AJS – Est du Canada – JOI-CF1600Product / Specifier GuideViewproduct-specifier-guidecanada-east
APA PR-S201 Fire-Rated Assemblies Code ReportCode ReportViewcode-reportus-east us-west canada-east canada-west
Multi-Family & Light Commercial Promo flyer – MTP-7100Multi-Fam/Light CommViewmflcus-east us-west canada-east canada-west
Guide de conception & d’installation pour la resistance au feu – Canada – MTP-CF7050Multi-Fam/Light Comm, Safety & FireViewmflc safety-firecanada-east
AJS I-joist Installation Guide – MTP-E7601Installation GuideViewinstallation-guideus-east
APA PR-E730 Qualified Wood I-Joists PR-E730 With Low Formaldehyde EmissionsCode ReportViewcode-reportus-east us-west canada-east canada-west
Guide d’installation Versa-Lam, BCI & AJS – Canada – MTP-CF7001*Popular, Installation GuideViewaa-popular installation-guidecanada-east canada-west
Boise Cascade I-joists and Mineral Wool Batts – JOI-1904Multi-Fam/Light CommViewmflc
AJS Commercial GuideMulti-Fam/Light CommViewmflcus-east canada-east
AJS 150/190 Product GuideProduct / Specifier GuideViewproduct-specifier-guideus-east
Canadian AJS 140, 20 & 25 Specifier GuideProduct / Specifier GuideViewproduct-specifier-guidecanada-east
Guide du concepteur multifamilial et commercial – Est du Canada – MTP-CF7610Multi-Fam/Light CommViewmflccanada-east
Canadian AJS 140, 20 & 25 Specifier Guide (French)Product / Specifier GuideViewproduct-specifier-guidecanada-east
Allowable Fastener Spacing & Design for BCI Joists and VERSA-LAM – GE-3Tech NoteViewtech-noteus-east us-west
BCI & AJS Flange Nailing Splits at Bearing Supports – IJ-21Tech NoteViewtech-noteus-east us-west
BCI & AJS Joist Slope-Cut Reinforcement – IJ-3Tech NoteViewtech-noteus-east us-west
BCI / AJS joist Nailed Connection to Hip or Valley Beam – IJ-5Tech NoteViewtech-noteus-east us-west
BCI / AJS Joist Web Stiffener Requirements – IJ-16Tech NoteViewtech-noteus-east us-west
BCI / AJS Joist, VERSA-LAM & BOISE GLULAM Exterior Exposure Policy – GE-4Tech NoteViewtech-noteus-east us-west
BCI / AJS Joists and Blocking Panels Shear Transfer Equivalency – IJ-1Tech NoteViewtech-noteus-east us-west
BCI / AJS Knockout and Field cut Web Hole Location Provisions – IJ-27Tech NoteViewtech-noteus-east us-west
BCI / AJS Rafter Connection to 2x Ceiling Joists – IJ-6Tech NoteViewtech-noteus-east us-west
BCI / AJS Rafter Cut Length Calculation – IJ-10Tech NoteViewtech-noteus-east us-west
BCI Door & Window Header Load Table – IJ-9Tech NoteViewtech-noteus-east us-west
BCI Joist Span to Depth Ratio in BC Calc – IJ-2Tech NoteViewtech-noteus-east us-west
Brick Veneer Support on Wood – GE-2Tech NoteViewtech-noteus-east us-west
Designing for Ceramic or Stone Tile Floor Finishes – GE-6Tech NoteViewtech-noteus-east us-west
Design Live Loads for Residential Floors – IJ-12Tech NoteViewtech-noteus-east us-west
Design Load Considerations for Non-Load Bearing Partition Walls in Residental Construction – GE-22Tech NoteViewtech-noteus-east us-west
Drop-In Gypsum Board for Floor Fire Protection Installation Guide – IJ-28Tech NoteViewtech-noteus-east us-west
Electrical Wiring Installation Horizontal Holes – GE-27Tech NoteViewtech-noteus-east us-west
Feet & Inches on a Regular Calculator – GE-9Tech NoteViewtech-noteus-east us-west
Fire Exposure of Engineered Wood Products – IJ-11Tech NoteViewtech-noteus-east us-west
FireBreak Ceramic Fiber Blanket Protection for AJS / BCI Joists: Installation Guide – IJ-26Tech NoteViewtech-noteus-east us-west
FireBreak HITS Fire Protection for AJS Joists: Installation Guide – IJ-29Tech NoteViewtech-noteus-east us-west
Flame Spread Classifications and Corresponding Surface Treatments – GE-13Tech NoteViewtech-noteus-east us-west
Flange Screw Provisions – IJ-34Tech NoteViewtech-noteus-east us-west
FMJ AJS 24 Joist for Fire Protection of Floors Installation Guide – IJ-30Tech NoteViewtech-noteus-east us-west
Floor Sheathing Installation Provisions for Composite Action Stiffness – IJ-8Tech NoteViewtech-noteus-east us-west
High Slope Roofs – GE-12Tech NoteViewtech-noteus-east us-west
Insect-Treated Engineered Wood Products Approved for Hawaii – GE-21Tech NoteViewtech-noteus-east us-west
Formaldehyde & Engineered Wood Products – GE-15Tech NoteViewtech-noteus-east us-west
Installed Damaged Product – GE-28Tech NoteViewtech-noteus-east us-west
Lateral Bracing of Joists and Beams – GE-16Tech NoteViewtech-noteus-east us-west
Mineral Wool Insulation for Floor Fire Protection Installation Guide – IJ-25Tech NoteViewtech-noteus-east us-west
Multiple Ply BCI / AJS Members – IJ-13Tech NoteViewtech-noteus-east us-west
Minor Cuts / Crushing of BCI / AJS Flanges – IJ-14Tech NoteViewtech-noteus-east us-west
PreserveTech HW / Royal Pacific Industries Insect-Treated Engineered Wood Products for Hawaii – GE-26Tech NoteViewtech-noteus-east us-west
Rafter Bracing and Kneewall Loads – GE-8Tech NoteViewtech-noteus-east us-west
Rectangular Web Holes in BCI Joists – IJ-31Tech NoteViewtech-noteus-east us-west
Pressure and Topical Applications and Treatments – GE-25Tech NoteViewtech-noteus-east us-west
Required Separation Between Garage and Living Space Above – GE-5Tech NoteViewtech-noteus-east us-west
Requirements for Additional BCI / AJS Joists to Support Parallel Partition Walls – IJ-22Tech NoteViewtech-noteus-east us-west
Rounded Rectangular Web Holes in BCI Joists – IJ-33Tech NoteViewtech-noteus-east us-west
Temperature and Moisture Content of Engineered Wood Products During Manufacturing – GE-10Tech NoteViewtech-noteus-east us-west
Temporary Storage of Gypsum Board on BCI / AJS Joists with Shoring – IJ-19Tech NoteViewtech-noteus-east us-west
Temporary Storage of Gypsum Board on BCI / AJS Joists – IJ-7Tech NoteViewtech-noteus-east us-west
Use of Boise Cascade EWP for Concrete Formwork – GE-24Tech NoteViewtech-noteus-east us-west
Use of Engineered Wood Products in International Shipping Pallets and Packaging – GE-17Tech NoteViewtech-noteus-east us-west
Vertical Load Transfer over Bearings within BC FRAMER & BC CALC – GE-23Tech NoteViewtech-noteus-east us-west
Web Armor Fire Protection for AJS / BCI Joists Installation Guide – IJ-23Tech NoteViewtech-noteus-east us-west
Web Holes Cut with SawTek Router – IJ-20Tech NoteViewtech-noteus-east us-west
Weights of Building Materials – GE-1Tech NoteViewtech-noteus-east us-west
Wood Frame Garage Floor Design Guidelines – GE-19Tech NoteViewtech-noteus-east us-west
Flame Spread and Fire Endurance: Surface Coatings – GE(CAN)-2Tech NoteViewtech-notecanada-east
Allowable Nail Spacing & Designfor AJS® / BCI® Joists and Versa-L am® LVL – GE(CAN)-3Tech NoteViewtech-notecanada-east
Weights of Building Materials – GE(CAN)-1Tech NoteViewtech-notecanada-east
BCI / AJS Joist, VERSA-LAM & BOISE GLULAM Exterior Exposure Policy – GE(CAN)-4Tech NoteViewtech-notecanada-east
Joist Ceiling Framing Over an Indoor Pool – GE(CAN)-5Tech NoteViewtech-notecanada-east
Formaldehyde & Engineered Wood Products – GE(CAN)-15Tech NoteViewtech-notecanada-east
Lateral Bracing of Joists and Beams – GE(CAN)-16Tech NoteViewtech-notecanada-east
Vertical Load Transfer over Bearings within BC FRAMER & BC CALC – GE(CAN)-23Tech NoteViewtech-notecanada-east
Pressure and Topical Applications and Treatments – GE(CAN)-25Tech NoteViewtech-notecanada-east canada-west
Interior Connection: Notched Post Glued and Bolted to Rim Joist – IJ(CAN)-16Tech NoteViewtech-notecanada-east
Designing for Ceramic or Stone Tile Floor Finishes – IJ(CAN)-15Tech NoteViewtech-notecanada-east
Horizontal Diaphragm Designed with BCI® joists – IJ(CAN)-18Tech NoteViewtech-notecanada-east
New BCI® / AJS® Joist Installed for Damaged – IJ(CAN)-19Tech NoteViewtech-notecanada-east
AJS®/ BCI® Joists Knockout and Field-Cut Web Hole Location Provisions – IJ(CAN)-20Tech NoteViewtech-notecanada-east
Headout Detail for Damaged BCI® or AJS® joists – IJ(CAN)-17Tech NoteViewtech-notecanada-east
Suspended Ceiling Details for AJS® or BCI® Joists – IJ(CAN)-21Tech NoteViewtech-notecanada-east
Sprinkler Attachment Details – IJ(CAN)-22Tech NoteViewtech-notecanada-east
AJS® / BCI® Joists to Steel Beam: – Hanger Connections – IJ(CAN)-23Tech NoteViewtech-notecanada-east
Location and Shapes of AJS® / BCI® Web Holes – IJ(CAN)-24Tech NoteViewtech-notecanada-east
Double AJS® Joist Without Filler Block Detail – IJ(CAN)-25Tech NoteViewtech-notecanada-east
Versa-Lam® Installed for Damaged AJS® / BCI® Joist – IJ(CAN)-26Tech NoteViewtech-notecanada-east
AJS® & BCI® Joist Web Restoration Detail – IJ(CAN)-27Tech NoteViewtech-notecanada-east
BCI® & AJS® Joist – 1/2” Deep Notch Top Flange Near Bearing – IJ(CAN)-28Tech NoteViewtech-notecanada-east
Minor Cuts / Crushing of Boise I-Joist Flanges – IJ(CAN)-1Tech NoteViewtech-notecanada-east
Drain Pipe at the Joist Location – IJ(CAN)-29Tech NoteViewtech-notecanada-east
BCI® & AJS® Joist – Hole Close to End Bearing: Repair Detail – IJ(CAN)-3Tech NoteViewtech-notecanada-east
BCI® & AJS® Joist – Half Notched Top Flange Near Bearing Repair – IJ(CAN)-4Tech NoteViewtech-notecanada-east
Higher Floor Performance – IJ(CAN)-2Tech NoteViewtech-notecanada-east
Floor Panel Installation Provisionsfor Composite Action (Glued & Nailed) – IJ(CAN)-5Tech NoteViewtech-notecanada-east
End Wall Blocking – IJ(CAN)-6Tech NoteViewtech-notecanada-east
Blocking at Interior Supports for Continuous or Cantilevered Joists – IJ(CAN)-7Tech NoteViewtech-notecanada-east
Split Joists at Interior Supports – IJ(CAN)-8Tech NoteViewtech-notecanada-east
Lapped Joist Bearing at Interior Supports – IJ(CAN)-9Tech NoteViewtech-notecanada-east
BCI® & AJS® Joists: Fire/Bevel-Cuts – IJ(CAN)-10Tech NoteViewtech-notecanada-east
BCI® & AJS® Joist Small Notch in Top Flange Repair – IJ(CAN)-12Tech NoteViewtech-notecanada-east
Multiple Ply BCI / AJS Members – IJ(CAN)-13Tech NoteViewtech-notecanada-east
BRICK-LEDGE CANTILEVERS – IJ(CAN)-11Tech NoteViewtech-notecanada-east
Fire and Design Installation Guide MTP-7050 – CAN – EnglishInstallation Guide, Safety & FireViewinstallation-guide safety-firecanada-east canada-west
Canada English Install Guide: AJS & BCI Joist, Versa-Lam-MTP-C7001Installation GuideViewinstallation-guidecanada-east canada-west
Tech Note IJ-24 – Analyzing Multiple Web Holes as a Single Encompassing HoleTech NoteViewtech-note

Learn All You Need to Know About I-Joists

As an engineered wood product, I-joists offer better consistency and strength while weighing less. Did you know all the I-joist uses, and benefits, or how they’re made? We’ve got all the details right here.

Support You Can Count On

Faster. Stronger. Easier.


Ready When (and Where) You Are

AJS Joists are sold throughout the Northeastern US and Eastern Canada.

Find a distribution center near you.