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MiTek

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RPB Retrofit Post Base

RPB-TZ post base attaches 4x4 or larger wood posts to

concrete or wood surfaces after the post is in place. Can be

installed with 1 or 2 RPB-TZs (single or double). Post may

also be installed on our CPB composite post base product

which provides a 1" stand off as required in untreated wood

installations. Installs with concrete screws, so no more

mis-installed, mis-located anchor bolts!

Materials: 12 gauge

Finish: G-185 galvanizing

Installation:

• MiTek’s WS structural wood screws and screw

anchors are not included with RPB bases.

• Not recommended for fence posts or other

unrestrained (not xed or fastened at top)

applications. These anchors are not designed

to resist overturning (moment) loads.

• Concrete Installation:

1. Place RPB-TZ over one corner of post ush

to both concrete and post surfaces and mark

hole locations in concrete. Place aside.

2. Drill holes for concrete screws using

appropriate bit and hammer drill.

3. Place RPB-TZ in position and install with

specied screw anchors as listed in table below.

4. Repeat for RPB-TZ on other side of post for

double installations.

• Wood-to-Wood Installation:

1. Place RPB-TZ over one corner of post ush

to wood base and post surfaces.

2. Install all specied MiTek WS structural wood

screws as listed in the table below.

3. Repeat for RPB-TZ on other side of post for

double installations.

Ref. No. Qty Wood Screw Qty Screw Anchor

2,3

2 3/8" x 2-1/2" 1525 710

4 Tapper+ 735 655

2 3/8" x 2-1/2" 1470 710

4 Tapper+ 735 655

2 3/8" x 2-1/2"

1470

710

4 Tapper+ 865 655

4 3/8" x 2-1/2" 2295

8 Tapper+ 1735

1 4 WS15 or WS3 4 1110

2 8 WS15 or WS3 8 2220

1) Allowable loads are for DF/SP 4x4, 6x6, or larger posts. For SPF/HF loads, multiply the allowable load by 0.86.

)

Use DeWalt 3/8" x 2-1/2" Screw-Bolt

+ screw anchor

;

or e

ual

installed in accordance with

manufacturer's s

ecification. Screw anchors are not su

lied.

3) Use Powers 1/4" x 1-3/4" Tapper+ concrete screw anchor (not supplied); or equal, installed in accordance with manufacturer's specification.

4) When installing connectors in pairs, the post must be a minimum of 2-1/2" from the edge of the concrete.

5) Allowable loads have been increased 60% for wind and seiesmic loads; no futher increase shall be permitted.

6) Concrete compressive strength shall be 2,500 psi or greater at 28 days.

7) LVL framing base shall be at least 1-3/4" thick.

8) SP framing base shall be at least 1-1/2" thick.

9) Allowable uplift for single RPB-TZ using WS3 structural wood screws with Screw-Bolt

+ screw anchors for concrete base with post 2-1/2" from concrete edge is 1,525 lbs.

10) MiTek's structural wood screws and DeWalt screw anchors should be used only in interior-dry and non-corrosive environments.

11) Use MiTek's WS15-EXT or WS3-EXT structural wood screws when installing to treated wood.

495

990990

1 4 WS15

Post Base

RPB-TZ RPBZ 12

Uplift

160%

Concrete Base with Post 2-1/2" from Concrete Edge

MiTek USP

Stock No.

Steel

Gauge

1 4 WS15 or WS3

8 WS15 or WS3

WS15 960

160%

Code

Ref.

Corrosion

Finish

LVL Base/SP Base

7,8

Concrete Base with Post Flush to Corner

1 4 WS3

DF/SP Allowable Loads (Lbs.)

1,5

Qty of

RPBs

Fastener Schedule

160%

Typical double RPB-TZ

installation with CPB

composite post base

(CPB ordered separately)

Typical double RPB-TZ

wood-to wood

installation

Typical double RPB-TZ

concrete installation

Min 2-1/2" from any

concrete edge

(Top view)

Typical single RPB-TZ

installation at concrete

corner, ush to edge

(Top view)

RPB-TZ

1) Allowable loads are for DF/SP 4x4, 6x6, or larger posts. For SPF/HF loads, multiply the allowable

load by 0.86.

2) Use DeWalt 3/8" x 2-1/2" Screw-Bolt

+ screw anchor; or equal, installed in accordance with

manufacturer's specication. Screw anchors are not supplied.

3) Use Powers 1/4" x 1-3/4" Tapper+ concrete screw anchor (not supplied); or equal, installed in

accordance with manufacturer's specication.

4) When installing connectors in pairs, the post must be a minimum of 2-1/2" from the edge

of the concrete.

5) Allowable loads have been increased 60% for wind and seismic loads; no further increase

shall be permitted.

6) Concrete compressive strength shall be 2,500 psi or greater at 28 days.

7) LVL framing base shall be at least 1-3/4" thick.

8) SP framing base shall be at least 1-1/2" thick.

9) Allowable uplift for single RPB-TZ using WS3 structural wood screws with Screw-Bolt

+ screw

anchors for concrete base with post 2-1/2" from concrete edge is 1,525 lbs.

10) MiTek's structural wood screws and DeWalt screw anchors should be used only in interior-dry and

non-corrosive environments.

11) Use MiTek's WS15-EXT or WS3-EXT structural wood screws when installing to treated wood.

2-1/2"

2-1/4"

1-1/2"

5-1/8"

Typical double RPB-TZ

concrete installation

Uplift

RPB-TZ (2)

4x4

RPB-TZ

4x4

Corrosion Finish

Stainless Steel Gold Coat

HDG Triple Zinc

Corrosion Finish Stainless Steel Gold Coat HDG Triple Zinc

Corrosion

Finish

Stainless Steel

Gold Coat

HDG

Triple Zinc

1" gap

allowed

Smaller

fastener holes for

wood or concrete

installation

Larger fastener

hole for screw

anchor installation