To the top

New Zealand International

Product Tabs

Product Details
MPB44Z
MPB44Z
MPB44Z Illustratiion
MPB44Z Illustratiion
MPB44Z Illustratiion
MPB44Z Illustratiion

The MPB Moment Post Base is specifically designed to provide moment resistance for timber columns and posts. With its innovative sleeve design, the patent-pending MPB encapsulates the post and keeps it from rotating at its base when lateral loads are applied at the top. This provides both the specifier and the contractor with greater design options and the opportunity to reduce the need for bracing, creating more unobstructed views. 

The MPB is ideal for freestanding outdoor structures such as carports, fences, pergolas, decks, trash enclosures and screen walls. The moment-resisting post base can greatly reduce — and sometimes eliminate — the need for additional bracing in outdoor structures. 

This innovative off-the-shelf solution has been engineered and tested to save specifiers and contractors the time and expense involved in designing, calculating and ordering custom-fabricated parts.  

Please check Corrossion Information if it is suitable for your application.

Material

Carbon Steel 2.7mm thick

Finish

ZMAX® Galvanised 

Features & Benefits
  • Suits 90mm x 90mm post
  • One-piece design simplifies installation and no additional bracing needed
  • Additional holes provided to attach trim material
  • Weep hole provided for water drainage
  • Tabs inside the MPB provide 25mm post standoff to help prevent rot from standing water and ground moisture
  • Stamped indicators and internal tabs identify the required concrete embedment depth
Installation
  • Use all specified fasteners 
  • Install MPB44Z before concrete is placed using embedment level indicators and form board attachment holes
  • Place post on tabs 25mm above top of concrete
  • Install Strong-Drive® SDS Heavy-Duty Connector screws, which are supplied with the MPB44Z (Coach screws will not achieve the same load)
  • Concrete level inside the part must not exceed 6mm above embedment line to allow for water drainage
  • Annual inspection of connectors used in outdoor application is advised. If significant corrosion is apparent 
  • or suspected, then the wood, fasteners and connectors should be evaluated by a qualified engineer or inspector
Model No. Table

Model
No.

Nominal
Column
Size

Dimensions

(in.)

Simpson
Strong-Tie
SDS
Screws

Concrete Allowable Loads

Wood Assembly
Allowable Loads (DF/SP)

Rotational
Stiffness

K (in.-lb./rad.)

Uplift
(lb.)

Lateral F1
(lb.)

Moment M
(ft.-lb.)

Download (lb.)

W1/

W2

D

H

Non-

Cracked

Cracked

Non-

Cracked

Cracked

Non-

Cracked

Cracked

(100)

(160)

Wind and Seismic Design Category A&B

MPB44Z

4x4

3 9/16

7 1/4

7 1/4

(16) 1/4" x 2 1/2"

4,900

3,990

1,825

1,280

1,410

985

6,240

6,410

2,510,000

Seismic Design Category C–F

MPB44Z

4x4

3 9/16

7 1/4

7 1/4

(16) 1/4" x 2 1/2"

4,785

3,350

1,535

1,075

1,180

830

6,240

6,410

2,510,000

  1. Loads may not be increased for short-term loading.
  2. Higher download can be achieved by solidly packing grout in the 1” standoff area before installation of the post. Posts bearing on grout must be naturally durable wood, preservative-treated wood, or installed with a moisture barrier between the post and grout. Allowable download shall be based on either the wood post design or concrete design calculated per code.
  3. Concrete shall have a minimum compressive strength, f’c = 2,500 psi.
  4. Tabulated rotational stiffness accounts for the rotation of the base assembly due to deflection of the connector, fastener slip and post deformation. Designer must account for additional deflection due to bending of the post.
  5. Multiply tabulated Seismic and Wind loads by 1.4 or 1.6 (1.67 for 2015 IBC) respectively to obtain LRFD capacities.
  6. In accordance with IBC Section 1613.1, detached one- and two-family dwellings in Seismic Design Category (SDC) C may use “Wind and SDC A&B” allowable loads.
  7. Foundation dimensions are for MPB anchorage only. Foundation design (size and reinforcement) by Designer.
  8. For loading simultaneously in more than one direction, the allowable load must be evaluated using the following equation: (Design Uplift/Allowable Uplift or Design Download/Allowable Download) + Design Moment/Allowable Moment + Design Lateral/Allowable Lateral ≤ 1.0.
  9. Tabulated load values may be used for rough sawn lumber or larger size posts without reduction factors. Rough-size and larger-size posts shall be planed uniformly on all four sides such that center line of post is concentric with the center line of MPBZ.
Brochures & Catalogues
Installation Guides

Installation Guides

PDF icon MPB Installation Guides
Technical Data & Docs

Technical Data Sheets

PDF icon Technical Data Sheet - MPB

Report Links

Warranty

Warranty

CAD Library
Masterspec
Alternative Products

Alternative Products

ABU Adjustable Post Base

The ABU Adjustable Post Base provides a high‑strength connection between the post and concrete.

CPT44Z

The CPT Concealed Post Base Tie is part of our concealed structural connector range, which combines structural strength with invisibility. The CPT provides a clean, concealed look while providing a 25mm standoff height above concrete.

Inspiration
Request a Demo

Request a Demo/Sample

Experience the innovation design of Simpson Strong-Tie's products and how we can help you build safer, stronger structures. Please fill out your details and submit the form below. We’ll be in touch to schedule a time to talk and give you a personal demo of Simpson Strong-Tie products.

Request a Demo/Sample

Experience the innovation design of Simpson Strong-Tie's products and how we can help you build safer, stronger structures. Please fill out your details and submit the form below. We’ll be in touch to schedule a time to talk and give you a personal demo of Simpson Strong-Tie products.

Structural Connections

 

Unmatched Quality from the Truss to the Foundation

With nearly 60 years of field and R&D experience, Simpson Strong-Tie® timber connectors are manufactured to the industry's highest standards. From framing angles to straps to heavy-duty joist hangers, we offer the most diverse product line so that you have the right product for the job.

Simpson Strong-Tie® connectors offer unmatched quality with laboratory and field testing, and are backed by our uncompromising commitment to customer service. As the company that built the connector industry, you can count on Simpson Strong-Tie® to work closely with builders, engineers and building officials to deliver innovative, building code-compliant solutions to help build safer, stronger structures economically. Download the Timber Connectors NZS 3604 Catalogue.

Timber Connectors

From testing to service to availability, everything we do is engineered to ensure your project's success. With every product, you know you are getting the quality, value, service and on-time delivery that we have built our reputation on for the past 60 years.

From straps and ties to joist hangers and much more, Simpson Strong-Tie® structural connectors increase the strength and safety of timber-frame structures. Each connector is unique to Simpson Strong-Tie and is designed for specific applications without the need to adapt metal plating to suit a connection. Download the Timber Construction Connectors Catalogue.

Steel Frame Connectors

From fully tested and engineered connectors and clips Simpson Strong-Tie® provides comprehensive structural solutions for cold-formed steel construction. From steel-to-steel connections to full-scale lateral solutions and curtain wall connectors, we remain committed to developing new technology that helps to advance the cold-formed steel industry.

Find out how Simpson Strong-Tie timber connectors can help you build the right way every day. Download the Cold-Fromed Steel Construction Connectors Catalogue.