Do you need sheathing under Hardie siding?

Joint placement: James Hardie states that all joints must land on a stud, unless you have minimum 7/16” wood structural paneling as sheathing. This means that the butt joints may develop a pattern if the installer is not paying attention.

Does Hardie siding require sheathing?

GENERAL REQUIREMENTS: 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. See General Fastening Requirements.

Do you need sheathing under cement board siding?

When installing fiber cement siding be sure to leave at least ¼” clear space between the siding and the flashing vertical siding should be installed and attached to the structural framing when a non-structural sheathing, gypsum board or foam-type sheathing are used.

What goes under Hardieboard?

Either is acceptable, but we recommend that the smooth side with the nailing pattern of every 8" on center go up. What subfloor should HardieBacker® cement board be installed over? The minimum subfloor specified is 5/8" exterior grade plywood or 23/32'' exterior grade OSB subflooring.

Can Hardie board be installed on studs?

HardiePlank® lap siding can be installed over braced wood or steel studs, 20 gauge (33 mils) minimum to 16 gauge (54 mils) maximum, spaced a maximum of 24 in o.c. or directly to minimum 7/16 in thick OSB sheathing.

3 Common Installation Issues with James Hardie Siding

What goes behind Hardie siding?

Joint flashing: James Hardie recommends that a slip sheet (joint flashing) is installed behind each butt joint in the siding. This is a 6” wide piece of weather resistive material to make sure that no water gets through.

Does Hardie board need insulation?

Hardie Plank is a cement board; it's composition is sand and water. It is heavy on the wall and provides no insulation value.

Does Hardie board need a moisture barrier?

Depending on your local building authority having jurisdiction (the AHJ) over your building codes, vapor barriers are almost always required, whether your builder uses James Hardie products or some other, inferior product.

Can I just screw down cement board?

Doing this will require that you remove the existing surface material before installing backer board over the studs. Cement board can also be used on countertops when laying tile. However, the process will involve using an extra sheet of backer board. Never use standard screws when installing cement board.

Can you use cement board as sheathing?

Five common structural exterior sheathing options include wood-based, gypsum, glass mat, cement board, and Barricade® Thermo-Brace®.

Do you need sheathing under T1 11?

Structurally rated 7/16” or thicker T1-11 siding can be fastened directly to the exterior face of studs at 16” centers and can act as both sheathing and siding in one. T1-11 siding 3/8” or less in thickness isn't rated as structural and will require sheathing underneath it.

Do exterior walls need sheathing?

Wood frame exterior walls must be fully sheathed, including areas above or below wall openings, with minimum 7/16-in. wood structural panels. Interior shear walls must be fully sheathed including areas above or below wall openings with minimum 7/16-in. wood structural panels on both wall faces.

Can you install siding directly to studs?

NOTE: Vinyl siding must be applied over a rigid sheathing that provides a smooth, flat surface or an underlayment (such as wood, wood composition, rigid foam or fiber sheathing) that is no more than 1" thick. Vinyl siding cannot be applied directly to studs.

Should there be plywood under siding?

The wood that goes under residential siding – exterior sheathing – performs several functions. It adds insulation, waterproofing and structural support for the framing. It also provides a surface on which to nail the siding. The most common sheathing materials include oriented strand board and plywood.

Does Hardie board need strapping?

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 board need to be pre drilled?

Nailing Basics

Fiberboard cement siding can be hand-nailed, but because it's so much harder and more brittle than wood, you have to predrill holes near any edge. You can save yourself a bunch of time by using a pneumatic coil siding nail gun.

Do I need plywood under cement board?

Because cement board can be used either for floors or walls, the surface below the cement board will vary: Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB).

Do you have to use thinset under Hardie board?

However, many manufacturers including, both Durock and Hardiebacker not only recommend that you use thinset under their backerboard, but they specify it and will void the warranty on their product if it's not used.

Can you use cement board as a subfloor instead of plywood?

When properly installed with a coat of thinset beneath it, cement backerboard won't flex like plywood, and won't contribute to problems like lippage. This makes cement backerboard a good choice for large format tile floors, as well as for older homes that may have more uneven subfloors.

Do you need waterproof membrane on cement board?

First, you should provide a waterproof/resistant membrane against the wood studs before installing the concrete backer-board to protect the wood studs from moisture absorbed through the backer-board.

Which is better cement board or Hardibacker?

HardieBacker is much more light, and it is also the best selling brand of cement board available. It is much cleaner because it does not have any glass in it. It allows for a smooth job with minimal mess. As a bonus, HardieBacker board has an EZ Grid pattern so you can cut perfect lines.

Does Hardie siding expand and contract?

Fiber cement (complying with ASTM C1186), as do all building materials, expands and contracts with changes in relative humidity and temperature. James Hardie recommends designing for this type of movement on buildings with long runs of continuous siding.

Can you insulate under fiber cement siding?

Foam insulation is contoured to perfectly fill the gap between fiber cement siding and your walls, which keeps thermal bridging at a minimum.

Is Hardie plank siding tax deductible?

If the Hardie Board was installed on your personal residence, then the IRS will not allow a deduction for this new siding. However, you may be eligible for a Residential Energy Credit if you added insulation during the process of replacing your siding.