ABU Adjustable Post Base with Uplift
Product Details
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, such as Titen HD®, Stainless-Steel Titen HD or SET-3G™.
- 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
| Model No. | Nominal Post Size | Ga. | W (in.) | L (in.) | H (in.) | HB (in.) | Coating/Material | Packaging Qty. |
|---|---|---|---|---|---|---|---|---|
| ABU1010RZ | Rough 10x10 | 14 | 10 | 9 | 7 | – | ZMAX® | 1 |
| ABU1010Z | 10x10 | 14 | 9 1/2 | 9 | 7 1/4 | – | ZMAX® | 1 |
| ABU1212RZ | Rough 12x12 | 12 | 12 | 11 | 7 | – | ZMAX® | 1 |
| ABU1212Z | 12x12 | 12 | 11 1/2 | 11 | 7 1/4 | – | ZMAX® | 1 |
| ABU44RZ | Rough 4x4 | Base 16; strap 12 | 4 1/16 | 3 | 5 1/4 | 1 1/2 | ZMAX® | 1 |
| ABU44SS | 4x4 | Base 16; strap 12 | 3 9/16 | 3 | 5 1/2 | 1 3/4 | Stainless Steel | 1 |
| ABU44Z | 4x4 | Base 16; strap 12 | 3 9/16 | 3 | 5 1/2 | 1 3/4 | ZMAX® | 1 |
| ABU46RZ | Rough 4x6 | 12 | 4 1/16 | 5 | 6 3/4 | 2 3/8 | ZMAX® | 1 |
| ABU46SS | 4x6 | 12 | 3 9/16 | 5 | 7 | 2 5/8 | Stainless Steel | 1 |
| ABU46Z | 4x6 | 12 | 3 9/16 | 5 | 7 | 2 5/8 | ZMAX® | 1 |
| ABU5-5Z | 5 1/8 x 5 1/8 | Base 12; strap 10 | 5 1/4 | 5 | 6 1/16 | 1 3/4 | ZMAX® | 1 |
| ABU5-6Z | 5 1/8 x 6 | Base 12; strap 10 | 6 1/8 | 5 | 6 1/16 | 1 3/4 | ZMAX® | 1 |
| ABU65Z | 6x5 | Base 12; strap 10 | 5 1/2 | 5 | 6 1/16 | 1 3/4 | ZMAX® | 1 |
| ABU66RZ | Rough 6x6 | Base 12; strap 10 | 6 1/16 | 5 | 5 13/16 | 1 1/2 | ZMAX® | 1 |
| ABU66SS | 6x6 | Base 12; strap 10 | 5 1/2 | 5 | 6 1/16 | 1 3/4 | Stainless Steel | 1 |
| ABU66Z | 6x6 | Base 12; strap 10 | 5 1/2 | 5 | 6 1/16 | 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 |
| ABU65Z | 5 1/2 x 5 | 12 | 10 | 5 1/2 | 5 | 6 1/16 | 1 3/4 | 5/8 | (12) 0.162 x 3 1/2 | — | — | 2475 | — | 10,960 |
| 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 | — | — | 4,120 | — | 22,405 |
| ABU88RZ | Rough 8x8 | 14 | 12 | 8 | 7 | 6 3/4 | — | (2) 5/8 | (18) 0.162 x 3 1/2 | — | — | 4,045 | — | 19,870 |
| ABU1010Z | 10x10 | 14 | 12 | 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 | 12 | 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 |
- Uplift loads have been increased for earthquake or wind loading with no further increase allowed. Reduce where other loads govern.
- Downloads may not be increased for short-term loading.
- Specifier is to design concrete and anchorage for uplift capacity.
- Some 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.
- All references to bolts are for structural-quality through bolts (not lag screws or carriage bolts) equal to or better than ASTM A307, Grade A.
- For higher downloads, pack grout solid under 1" standoff plate before installation. Base download on column or concrete, according to the code.
- HB dimension is the distance from the bottom of the post up to the first bolt hole.
- 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. See technical bulletin T-C-SCLCLM for more information.
- Downloads shall be reduced where limited by capacity of the post.
- 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
- Uplift loads have been increased for earthquake or wind loading with no further increase allowed. Reduce where other loads govern.
- Downloads may not be increased for short-term loading.
- Specifier is to design concrete and anchorage for uplift capacity.
- Beam depth must be a minimum of 7 1/4".
- Shims are required for ABU46Z double 2x (1 shim) and ABU66Z triple 2x (2 shims) installations as shown in the illustration. Additional fastening of shim to beam is not required.
- 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.
ABU66Z Beam Installation
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
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
