What lengths does Hardie siding come in?

HardiePanel vertical siding is 5/16 in. thick and is available in 4×8, 4×9 and 4×10 sizes. Please see your local James Hardie dealer for texture and size availability. HardiePanel vertical siding is available as a prefinished James Hardie® product with ColorPlus® Technology.

What size does Hardie board come?





HardieTrim® Batten Boards are 19mm (¾ in) thick, 64mm (2½ in) wide, and come on 3,658mm (12 ft) lengths. See your local dealer for details and availability of product colors and accessories. A Complete James Hardie Exterior – Close-up on trim products.

What widths does hardiplank siding come in?

Select Cedarmill & Smooth

Thickness 5/16 in. 5/16 in.
Length 12 ft. planks 12 ft. planks
Width 5.25 in. 7.25 in.
Exposure 4 in. 6 in.

Should there be a gap between Hardie board siding?

Hardie siding requires a minimum 2” gap from all hard surfaces like decks or rooflines, and at least 8” from any soft surfaces like grass, dirt, or gravel.

How much should Hardie plank overlap?





Flashing behind butt joints is an effective, low maintenance way to comply with building code and help protect against water intrusion. James Hardie recommends 6-inch-wide flashing that overlaps the course below by 1-inch. However, some local building codes may require different size flashing.

What is behind Hardie board?

Hardie board is a special siding material that uses cement fibers to create a more durable and attractive product. Cement is combined with sand, water and cellulose wood fibers to create a material particularly suited to protect home exteriors, especially in the Kansas City area.

Can you paint Hardie plank siding?

Yes, you can, and you should. Painting Hardie board siding will significantly improve its look and its longevity. Siding finishes generally last for around 15 years, so you need to do it, and do it right. Painting, when done properly can really bring out the wood feel of the Hardie board.

What are the cons of Hardie board?

The Cons

  • High Installation and Labor Costs: Hardie board siding requires more planning, a larger labor force, and takes longer to install due to its composition. It weighs about 300 pounds (100 square feet) compared to 60-70 pounds for vinyl siding. …
  • Maintenance: It has to be re-painted periodically.


How do you cut Hardie planks?

You can use a jigsaw, table saw or circular saw, or another tool, as long as it’s equipped with the right kind of blade. Once prepared, cut the Hardie board as you would any other material. Mark your line; align the board against the guard as needed and slowly but firmly make the cut.

Do you nail or screw Hardie board?

James Hardie prefers and recommends installation of HardiePlank® lap siding by the blind nailing technique, such that fasteners are hidden by the course above. Fasteners shall be installed between 1 in. and 3/4 in. from the top edge and no closer than 3/8 in.

Do you caulk Hardie board siding?



James Hardie DOES NOT recommend using caulk or “H”-jointers for the butt joints of HardiePlank® siding with ColorPlus® technology. James Hardie also DOES NOT recommend applying caulk to the horizontal overlap between siding planks (see Figure 2).

Do you need insulation under Hardie siding?

James Hardie siding and trim products can be installed over solid-foam insulation board up to 1-in. thick. Caution should be taken as irregularities and unevenness in framing, sheathing, foam and other wall assembly components, including under driven nails, can telegraph through to the finished siding and trim.

Do you need strapping for Hardie board?

Best Practice. Even though James Hardie does not require a rainscreen in most cases, it can still be a relatively inexpensive way to improve the long-term health and performance of your structure. Particularly with HardiePanel, we always recommend at least a drainable housewrap as a weather barrier.

Does Hardie siding Add R-value?

Most siding R-values are less than 1. Standard vinyl siding has an R-value of 0.61, and Hardie siding’s R-value is 0.37. While vinyl siding is more energy-efficient, neither makes a significant difference in how much energy your home will save.

Can you install hardiplank directly to studs?



HardiePlank® 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.

Can you use a nail gun on hardiplank?

Overall, only two types of power nailers work best for attaching hardie siding: siding and roofing nailers. But if you must use a framing nailer, to install any James Hardie product, be sure to fit it with a quality flush mount attachment so as to control the depth the fastener is driven.

Do I need plywood under Hardie siding?

Fiber cement siding should be installed over plywood, OSB, or sheathing. Be sure that the siding installed is dry. Otherwise, it might shrink at butt joints.

Can you nail through Hardie board?

For Hardie siding, it’s recommended to use stainless steel or hot-dipped galvanized nails. You can either nail by hand or use a pneumatic nailer. However, it’s best to use a pneumatic nailer for speed and consistency. At the bottom, the siding should be face nailed, and at the top, it should be blind nailed.

Can you use screws on Hardie trim?



ET&F or equivalent fasteners or screws may be used to attach HardieTrim boards to steel frame construction. Fastening instructions are similar for all applications. When using finish nails, position nails no closer than 13 mm (1/2 in) from the edges of the trim and for all other fasteners no closer than 19 mm (3/4 in).

Can I use a framing nailer for Hardie siding?

Yes, you can. You can use a framing nailer for hardie siding, but it takes some work. It is important to use the right nails, however. Framing nailers are a popular choice for many contractors and homeowners when it comes to installing siding.