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ABU Adjustable Post Base with Uplift

ABU

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The ABU is designed to attach wooden posts to existing concrete in high capacity applications. The built-in 1" standoff of this adjustable post base helps to prevent rot at the end of the post. The ABU has a slotted anchor hole in the base for adjustability and attaches to the post with nails, Strong-Drive® SD Connector screws or bolts. This versatile post base makes a cost-effective option for securing a post to the foundation, with a design built for maximum uplift performance.

Key Features

  • The slot in the base enables flexibility around the anchor bolt, making precise post placement easier
  • 1" stand-off design meets code requirements for structural posts installed in basements or exposed to weather or water splash
  • Increased uplift loads for earthquake or wind loading

Material

  • See table

Finish

  • ZMAX® and some in stainless steel; see Corrosion Information

Installation

  • Use all specified fasteners; see General Notes.
  • See our Anchoring, Fastening and Restoration Systems for Concrete and Masonry catalog for retrofit anchor options.
  • Post bases do not provide adequate resistance to prevent members from rotating about the base and therefore are not recommended for non-top-supported installations (such as fences or unbraced carports).
  • Place the base, cut washer(s) or load transfer plate(s) and nut(s) on the anchor bolt(s). Make any necessary adjustments to post placement and tighten the nut securely on the anchor bolt.
  • Place the standoff base and then the post in the ABU.
  • Fasten the post using nails or Strong-Drive SD Connector screws or bolts (ABU88Z, ABU1010Z, ABU1212Z — SDS optional).

Related Literature

Product Information Table

Fastener Production Information and Stuff & Things
New products
Model No. Nominal Post Size Ga. W (in.) H (in.) L (in.) HB (in.) Coating/Material Packaging Qty.
ABU1010RZ Rough 10x10 14 10 7 9 ZMAX® 1
ABU1010Z 10x10 14 9 1/2 7 1/4 9 ZMAX® 1
ABU1212RZ Rough 12x12 12 12 7 11 ZMAX® 1
ABU1212Z 12x12 12 11 1/2 7 1/4 11 ZMAX® 1
ABU44RZ Rough 4x4 Base 16; strap 12 4 1/16 5 1/4 3 1 1/2 ZMAX® 1
ABU44SS 4x4 Base 16; strap 12 3 9/16 5 1/2 3 1 3/4 Stainless Steel 1
ABU44Z 4x4 Base 16; strap 12 3 9/16 5 1/2 3 1 3/4 ZMAX® 1
ABU46RZ Rough 4x6 12 4 1/16 6 3/4 5 2 3/8 ZMAX® 1
ABU46SS 4x6 12 3 9/16 7 5 2 5/8 Stainless Steel 1
ABU46Z 4x6 12 3 9/16 7 5 2 5/8 ZMAX® 1
ABU5-5Z 5 1/8 x 5 1/8 Base 12; strap 10 5 1/4 6 1/16 5 1 3/4 ZMAX® 1
ABU5-6Z 5 1/8 x 6 Base 12; strap 10 6 1/8 6 1/16 5 1 3/4 ZMAX® 1
ABU65Z 6x5 Base 12; strap 10 5 1/2 6 1/16 5 1 3/4 ZMAX® 1
ABU66RZ Rough 6x6 Base 12; strap 10 6 1/16 5 13/16 5 1 1/2 ZMAX® 1
ABU66SS 6x6 Base 12; strap 10 5 1/2 6 1/16 5 1 3/4 Stainless Steel 1
ABU66Z 6x6 Base 12; strap 10 5 1/2 6 1/16 5 1 3/4 ZMAX® 1
ABU88HDG 8x8 Base 14; strap 10 7 1/2 7 7 Hot-Dip Galvanized 1
ABU88RHDG Rough 8x8 Base 14; strap 10 8 7 7 Hot-Dip Galvanized 1
ABU88RZ Rough 8x8 Base 14; strap 12 8 7 7 ZMAX® 1
ABU88SS 8x8 Base 14; strap 10 7 1/2 7 7 Stainless Steel 1
ABU88Z 8x8 Base 14; strap 12 7 1/2 7 7 ZMAX® 1

Load Tables

Allowable Loads — Post Installation

    These products are available with additional corrosion protection.

    For stainless-steel fasteners, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

    Many of these products are approved for installation with Strong-Drive® SD Connector screws.

Model No. Nominal Post Size Material (ga.) Dimensions (in.) Fasteners Allowable Loads (DF/SP)
Base Strap W L H HB Anchor Dia. (in.) Nails (in.) Bolts Uplift Down (100)
Qty. Dia. (in.) Nails Bolts
ABU44Z 4x4 16 12 3 9/16 3 5 1/2 1 3/4 5/8 (12) 0.162 x 3 1/2 2 1/2 1,900 2,300 7,570
ABU44RZ Rough 4x4 16 12 4 1/16 3 5 1/4 1 1/2 5/8 (12) 0.162 x 3 1/2 2 1/2 1,900 2,300 7,570
ABU46Z 4x6 12 12 3 9/16 5 7 2 5/8 5/8 (12) 0.162 x 3 1/2 2 1/2 2,405 2,265 12,520
ABU46RZ Rough 4x6 12 12 4 1/16 5 6 3/4 2 3/8 5/8 (12) 0.162 x 3 1/2 2 1/2 2,405 2,265 12,520
ABU5-5Z 5 1/8 x 5 1/8 12 10 5 1/4 5 6 1/16 1 3/4 5/8 (12) 0.162 x 3 1/2 2 1/2 2,235 2,235 10,570
ABU5-6Z 5 1/8 x 6 12 10 6 1/8 5 6 1/16 1 3/4 5/8 (12) 0.162 x 3 1/2 2 1/2 2,235 2,235 10,570
ABU66Z 6x6 12 10 5 1/2 5 6 1/16 1 3/4 5/8 (12) 0.162 x 3 1/2 2 1/2 2,475 2,190 18,205
ABU66RZ Rough 6x6 12 10 6 1/16 5 5 13/16 1 1/2 5/8 (12) 0.162 x 3 1/2 2 1/2 2,475 2,190 18,205
ABU88Z 8x8 14 12 7 1/2 7 7 (2) 5/8 (18) 0.162 x 3 1/2 2,570 22,405
ABU88RZ Rough 8x8 14 12 8 7 7 (2) 5/8 (18) 0.162 x 3 1/2 2,450 19,870
ABU1010Z 10x10 14 14 9 1/2 9 7 1/4 (2) 5/8 (22) 0.162 x 3 1/2 2,270 32,020
ABU1010RZ Rough 10x10 14 14 10 9 7 (2) 5/8 (22) 0.162 x 3 1/2 1,830 31,650
ABU1212Z 12x12 12 12 11 1/2 11 7 1/4 (2) 5/8 (22) 0.162 x 3 1/2 3,000 34,745
ABU1212RZ Rough 12x12 12 12 12 11 7 (2) 5/8 (22) 0.162 x 3 1/2 3,000 34,745
  1. Uplift loads have been increased for earthquake or wind loading with no further increase allowed. Reduce where other loads govern.
  2. Downloads may not be increased for short-term loading.
  3. Specifier is to design concrete and anchorage for uplift capacity.
  4. ABU products may be installed with either bolts or nails (not both) to achieve table loads. ABU88Z, ABU88RZ, ABU1010Z, ABU1010RZ, and ABU1212Z/RZ may be installed with (8) 1/4" x 3" Strong-Drive® SDS Heavy-Duty Connector screws (sold separately) for the same table load.
  5. For higher downloads, pack grout solid under 1" standoff plate before installation. Base download on column or concrete, according to the code.
  6. HB dimension is the distance from the bottom of the post up to the first bolt hole.
  7. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. For SCL columns, the fasteners for these products should always be installed in the wide face.
  8. Downloads shall be reduced where limited by capacity of the post.
  9. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Allowable Loads — Beam Installation

ABA/ABU/ABW Allowable Loads — Beam Installation
  1. Uplift loads have been increased for earthquake or wind loading with no further increase allowed. Reduce where other loads govern.
  2. Downloads may not be increased for short-term loading.
  3. Specifier is to design concrete and anchorage for uplift capacity.
  4. Beam depth must be a minimum of 7 1/4".
  5. Shims are required for double 2x (1 shim) and triple 2x (2 shims) installations as shown in the illustration. Additional fastening of shim to beam is not required.
  6. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Load Values with Strong-Drive® SD Connector Screws

    These products are available with additional corrosion protection.

Model No. Nominal Post Size Fastener Allowable Loads (DF/SP)
Anch. Dia. Post Uplift (160) Down (100)
Screws
ABU44Z 4x4 5/8 12-SD10112 2140 6665

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT