054N010/HD CRIB WALL 001 3/9/04 1:14 PM Page 1

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The diagrams below detail the layout of headers andstretchers for the three types of crib wall construction,Types 1, 2 and 3. Once the wall type is selected, follow thelayout pattern for the wall design chosen. For Type 2 and3 walls, 1800mm or 2400mm stretchers may be used.

Diagram D

LENGTHS AVAILABLE600, 900, 1200, 1800 & 2400mm

125mm

TIMBER CARECutting, notching or boring may expose untreated heartwood.A liberal coating of PROTIM RESEAL is recommended torestore the protective envelope. For more details refer to thePROTIM TimberCare product literature. The appearanceand surface water repellency of treated timber can beenhanced periodically with PROTIM Raincoat UV Plus.

CLASSIFICATIONS FOR TREATED TIMBERH1 Hazard LevelExposure – inside above ground. Conditions – completely protectedfrom the weather and well-ventilated. Biological Hazards – insectsother than termites (i.e. lyctid or anobiid). Uses – framing, flooring,furniture, and interior joinery.

H2 Hazard LevelExposure – inside above ground. Conditions – completely protectedfrom the weather and well-ventilated. Biological Hazard – borers includingtermites. Uses – framing, flooring, furniture and interior joinery.

H3 Hazard LevelExposure – outside above ground. Conditions – subject to periodicmoderate wetting and leaching. Biological Hazard – moderate decay,borers and termites. Uses – weatherboard, fascia, window joinery,framing and decking.

H4 Hazard LevelExposure – outside in ground. Conditions – subject to severe wettingand leaching. Biological Hazard – severe decay, borers and termites.Uses – fencing, greenhouses, pergolas and landscaping timber (non-critical structures).

H5 Hazard LevelExposure – outside in ground contact with or in fresh water.Conditions – subject to extreme wetting and leaching and/or where thecritical use requires a higher degree of protection. Biological Hazard –very severe decay, borers and termites. Uses – retaining walls, piling,house stumps, building poles, cooling tower fill.

H6 Hazard LevelExposure – marine water. Conditions – subject to prolonged immersionin sea water. Biological Hazard – marine wood borers and decay.Uses – boat hulls, marine piling, jetty cross bracing, landing steps etc.

Natural ground

Compactedgranular backfill

1

4

Backfill slope (2:1)

These plans have been checked and approved (at the time of printing) byRoy B.Hoskins & Associates of Qld 4006 (Structural & Civil Engineers),

to be technically accurate and designed in accordance with the appropriateAustralian Building standards.

As local & National laws are subject to change, please ensure you checkwith your local authorities prior to starting construction.

For further information see separate brochure,Consumer Information & Handling Guides, and Guarantee documents.

Osmose®, PROTIM®, TimberCare™, RainCoat ® and RESEAL™

are trademarks of Osmose, Inc. or its subsidiaries.04/2003 © Osmose, Inc.

YOUR LOCAL DISTRIBUTOR

Heavy Duty Crib Walls provide an attractiveeasy to construct retaining wall system suitedfor applications where ground conditionsare not suitable for deep post embedmentand soil conditions are suitable for crib wallconstruction.

Crib wall components are produced from logs whichhave been sawn on two sides to produce a parallel slabapproximately 125mm in thickness.

Diagram B

In order for your supplier to assist you in accurately calculatingthe correct crib wall design, it is important to know the angleof the backfill slope.

Diagram C

HEADER SPACING FOR TYPE “2” AND TYPE “3” WALLS 1800 or 2400mm STRETCHERS

TYPE1

450 900 900 900 450

450

450

450

450

1800 1800 1800

600

2400

600 600 600 600 600

300

300

300

300 600

24001800 1800 1800

600

300600 600 600 600

300

300

300

300

300600

TYPE2 & 3

H O W T O B U I L D

TREATED PINEHEAVY DUTYCRIB WALLS

054N010/HD CRIB WALL 001 3/9/04 1:14 PM Page 2

The material used for back fill is very important. For 2.0 metrehigh walls, dense silt or silty sand can be used. For walls upto 3.5 metres, sand or gravel and sand is required to allowadequate drainage. Above 3.5 metres, clean gravel, sand orbroken stone is required.

Crib walls can be constructed from either slabsmachined from logs ranging from 125 to 150mmdiameter or landscape timbers. Stretchers areavailable in 2.4 and 1.8 metre lengths, while headersare supplied in 0.6, 0.9 and 1.2 metre lengths. Thecorrect choice of headers and stretchers for yourparticular application are dependent upon theheight of the wall and the soil type.

Please consult with your local stockist or professionaltradesmen for more detailed design information.

MATERIALSOnce the foundation stretchers are in position, the first layer ofheaders is placed in position at the correct centres. (See diagramA). Headers should be pre-drilled and secured to the stretchersby driving a galvanised bridge spike into the stretcher. Eachlevel must be secured in this manner as the wall progresses.Timber angle guides should be nailed periodically along the wallto ensure the correct batter is maintained.

HALF ROUND LOGSFOR DECORATIVE WALLSDecorative walls can also be constructed from half round logs asshown. (Design criteria for this brochure is based on slab rounds).

1

Wall Face(Batter)

Drain pipe position(if required)

1

4

CROSS SECTION

100

CRIB DESIGN 1 CRIB DESIGN 2 CRIB DESIGN 3 600mm Headers 900mm Headers 1200mm Headers at 900mm Centres at 600mm Centres at 600mm Centres

Outer face soil line

Stretcher

Header

The diagram below shows three possible crib wallarrangements. Consult with your stockist on the most suitabledesign to be used for your application. You will need toknow the height of the wall, the soil type and the angle ofthe backfill slope. (Diagram C).

Diagram A

Place backfill on a continuous basis as the wall progressesensuring the back fill is sufficiently compacted. Ensure that eachlayer is filled and tamped down on an individual basis.Do not leave the back filling until the wall is completed orthe soil will not be sufficiently compacted.

1 horizontal to 4 slope.

CRIBDESIGN

HEADERLENGTH

(mm)

MAX WALLHEIGHT

(mm)

1

3

2

600

1200

900

900

1800

1200

Crib walls must be constructed with a backwards lean (batter)of 1:4. A template should be prepared on which a spirit levelcan be placed to ensure the correct angle of the base andbatter is maintained as the wall progresses.

4

3

2