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Hardi-Plank™

This is the Hardi Plank installation sheet for lap siding. We are adding this page to this web site to help buyers deal with builders.  Hardi Plank is a wildly used product. However ninety (90%) percent of the Hardi Plank products we see installed in the Houston area appear to be installed improperly according to Hardi Planks instructions and this could void your warranty.    

Hardi Soffit installation      Hardi Panel installation

 

HARDIPLANK Logo
LAP SIDING - INSTALLATION INSTRUCTIONS
May 1999

SELECT CEDARMILL© * SMOOTH * COLONIAL SMOOTH® * COLONIAL ROUGHSAWN® * BEADED CEDARMILL * BEADED SMOOTH
IMPORTANT: FAILURE TO INSTALL AND FINISH HARDIPLANK ® PER JAMES HARDIE'S WRITTEN INSTRUCTIONS MAY AFFECT PRODUCT PERFORMANCE AND WILL VOID THE WARRANTY. LOCAL BUILDING CODE REQUIREMENTS ALSO APPLY.

 


Handling and Storage HANDLING & STORAGE
Store flat and keep dry prior to installation. Installing siding wet or saturated may result in shrinkage at butt joints. Carry planks on edge.
CUTTING OPTIONS:
Circular Saw
Circular saw with carbide tipped blades
Snapper Steel Head
"SNAPPER STEEL HEADTM" Electric Hand Shear
Snapper Shear
"SNAPPER SHEARTM" Pneumatic Shear
Score and snap knife
Score and snap
knife
Call 800-297-7487 for shear tool information.

Always wear safety glasses and dust protection when operating power tools. For more information on avoiding inhalation refer to the MATERIAL SAFETY DATA SHEET available wherever James Hardies' fiber-cement products are sold.


FRAMING REQUIREMENTS:

Hardiplank Installation Instructions Figure 1 Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24" o.c. or directly to minimum 7/16" thick OSB sheathing. Hardiplank lap siding can also be installed over foam insulation up to 1" thick. Irregularities in framing, sheathing and/or foam insulation can mirror through the finished application. A weather resistive barrier is required*. Install Hardiplank siding with joints butted in moderate contact. Optionally, install the lap siding with a maximum 1/8" gap and caulk the joint** (see detail at right)

The first course of any wall should be installed over a 1/4" lath strip to ensure a consistent plank angle (see figure 1).

*Use a weather-resistive barrier in accordance with: BOCA National Building Code Section 1403.3; SBCCI Standard Building Code Section 2303.3; ICBO Uniform Building Code Section 1402.1; or CABO One-and=Two Family Dwelling Code Section 703.2.1.

NOTE: Some Building Codes exempt the use of weather-resistive barriers over "water-repellent panel sheathing" or exterior panels classified as "weather-resistive barriers". James Hardie recommends the use of "building paper type" weather-resistive barriers with all siding products. James Hardie will assume no responsibility for moisture within the wall.

 


GRADE CLEARANCE

Install Hardipanel/hardiplank such that they are not in ground contact and not subjected to standing water.

Figure 2
Hardiplank Installation Instructions Figure 2

ROOF CLEARANCE

At the juncture of the roof and vertical surfaces, flashing and counterflashing shall be provided per the roofing manufacturer's instructions. Provide a 1"-2" clearance between the roofing and bottom edge of siding or as recommended by the roofing manufacturer.
Figure 3
Hardiplank Installation Instructions Figure 3


CONCRETE CONSTRUCTION
Figure 4

Hardiplank siding can be installed directly to masonry block. Hardiplank siding can also be installed to concrete construction, when the wall is furred out with wood framing or minimum No. 20 gauge steel framing anchored to the wall. Framing can be spaced up to 24" OC. Consult National Evaluation Service report NER-405 for recognized applications to masonry block and wood or metal framing. A weather-resistive barrier* is recommended between the framing and the siding.



FACE NAIL: (All Lap Products) Figure #5

Corrosion Resistant Nails (galvanized or stainless steel)
6d (0.118" shank x 0.267" HD x 2" long)
Siding nail (0.089" shank x 0.221" HD x 2" long)**
Siding nail (0.091" shank x 0.221" HD x 1 1/2" long)±

Corrosion Resistant Screws

Ribbed Bugle-head or equivalent (No. 8-18 x 0.323" HD x 1 5/8" long) Screws must penetrate 1/4" or 3 threads into metal framing.

 

BLIND NAIL: Figure #6
Hardiplank siding cannot be blind nailed 24" o.c. 12" wide Hardiplank siding cannot be blind nailed. When blind nailing 9 1/4" or 9 1/2" Hardiplank, use 11 ga. roofing nail x 1 1/4" long.

Corrosion Resistant Nails (galvanized or stainless steel)
6d (0.118" xhank x 0.267" HD x 2" long)
Siding nail (0.089" shank x 0.221" HD x 2" long)**
11ga. roofing nail (0.121" shank x 0.371" HD x 1 1/4" L)

Corrosion Resistant Screws

Ribbed Bugle-head or equivalent (No. 8-18 x 0.323" HD x 1-5/8" long). Screws must penetrate 1/4" or 3 threads into metal framing.

 


Hardiplank Installation Instructions Figure 5
±For face nail application of 9 1/2" wide or less siding to OSB, fasteners are spaced a maximum of 12" oc.

**The use of a siding nail or roofing nail may not be applicable to all installations where greater windloads or higher exposure categories of wind resistance is required by the Local Building Code. Consult Report No. NER-405 for specific details.

 


PNEUMATIC FASTENING:

Hardiplank can be hand nailed or fastened with the use of a pneumatic tool. Set your air pressure so that the fastener is driven snug with the shingle surface.

RECOMMENDED:
Use a flush mount attachment on pneumatic tool. This will help control the depth that the nail is driven. This will be especially helpful when more than one pneumatic tool is being driven off the same compressor.

Hardiplank Installation Instructions - Do not Staple FASTENER REQUIREMENTS:
Drive fasteners perpendicular to siding and framing.
Fastener heads should fit snug against siding. (no air space)
Do not over-drive nail heads or drive nails at an angle.
If nail is countersunk, caulk nail hole and add a nail. (Fig. C)

 

Hardiplank Installation Instruction - Figs. A, B and C
NAIL TYPE:
Fasteners must be corrosion resistant, galvanized or stainless steel. Electro-galvanized nails are acceptable for use with James Hardie Siding Products, but may exhibit premature corrosion. We recommend the use of quality, hot-dipped galvanized nails, such as the Maze® brand or that of an equivalent brand. To contact Maze Nails direct please call 800-435-5949. (James Hardie is not responsible for the corrosion resistance of fasteners).

 


FINISHING HARDIPLANK

Patching: Dents, chips and cracks can be filled with a cementitious patching compound.


Caulking:
A high quality, paintable caulk is recommended. For best results use caulks that comply with either ASTM C 834 or ASTM C 920. Caulking should be applied in accordance with caulking manufacturers written instructions. (Leave 1/8'' gap at trim for caulk. Caulking at butt joints is optional.)

Painting:
James Hardie products must be painted. For best results use Hardie Soffit and Fascia with our exclusive Prime Plus TM factory priming system and a 100% acrylic topcoat (s). *If our Prim PlusTM factory priming is not being used, Hardie recommends the application of an alkaline-resistant primer along with 100% acrylic topcoat(s). (For paint manufacturer's paint specifications, refer to JH Technical Bulletin No. S-100.)
*Note: Please refer to paint manufacturers specifications for application rates.

 


APPROVALS: HARDIPLANK lap siding is recognized as an exterior wall cladding in National Evaluation Report No. NER405 (BOCA, ICBO, SBCC): City of Los Angeles, Research Report No. 24862; Dade County, Florida, Acceptance No. 99-0223.07, US Dept. of HUD Materials Release 1263a, California DSA PS-019 and City of New York MEA 223-93-M. These documents should also be consulted for additional information concerning the suitability of this product for specific applications. For Technical assistance Call 1-800-9-HARDIE. ©1999 James Hardie Building Products. FAILURE TO ADHERE TO WARNING, MSDS, AND INSTALLATION INSTRUCTIONS MAY LEAD TO SERIOUS PERSONAL INJURY.

 



WARNING: AVOID BREATHING SILICA DUST

Product contains Silica. Inhalation of respirable silica dust can cause silicosis a potentially disabling lung disease, and is known to the State of California to cause lung cancer. When drilling, cutting, or abrading product during installation or handling. (1) Work outdoors where feasible, otherwise use mechanical ventilation, (2) Wear a dust mask or, if dust may exceed PEL, use NIOSH/MSHA approved respirator, (3) Warn others in area. For further information, refer to material safety data sheet or consult employer.

FAILURE TO ADHERE TO WARNINGS, MSDS, AND INSTALLATION INSTRUCTIONS MAY LEAD TO SERIOUS PERSONAL INJURY.

 




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James Hardie Building Products Inc.
Copyright © 1997-99. All Rights Reserved.
E-mail: info@JamesHardie.com
Updated September 3, 1999

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