Quick Answer: How Far Can 3/4 Plywood Stair Tread Span?

How far can you span stair treads?

The maximum 18-inch spacing presumes treads of 5/4-inch wood decking or 2-by stock. When using synthetic decking for treads, consult the decking manufacturer’s instructions – many require stringers be spaced no farther apart than 12 inches or 10 inches, and some even require spacing as close as 8 inches.

Can plywood be used for stair treads?

While ¾” thick plywood or OSB is considered sufficiently thick for subfloors, it is not uncommon to use a thicker material for the stair treads. One inch of total plywood thickness is ideal and can be made from two layers of ½” plywood, bonded together.

How far can stairs span without support?

The minimum recommended size for a deck stair stringer is 2×12, which has a maximum recommended unsupported span of 6 feet.

What thickness should stair treads be?

What is the proper thickness for stair treads? According to building codes, stair tread for wood stairs has to be anywhere from 1” to 1 ½” in thickness.

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Do stairs need support in the middle?

Yes, the stringers need to be supported along their length, but they can span a few feet too, depending on 1) the width of the stairs, 2) the number of stringers, and 3) size of riser board. 1) The wider the stair the more load will be transferred to the stringers.

Can I use 2×12 for stair treads?

Stair treads may be made of a single 2×12, but are often made of two decking boards or 2x6s. A stringer is a wide board, usually a 2×12, that runs at an angle from the landing pad to the deck framing and supports the treads. The stair treads should be at least 36 inches wide.

What kind of wood is used for stair treads?

Oak Stair Treads Oak is a common type of wood for stair treads. It has a lot of positive qualities that make it a good option. Oak matches virtually any home style and is among the most durable of wood species. It’s also available with several additional options.

Can you use OSB for stair treads?

Staircases aren’t always a pricey showcase in a house; as a cost-saving measure, they sometimes are constructed from OSB, which is Oriented Strand Board. OSB stair treads are sturdy and functional, but they usually require a covering to make them attractive.

Can I use MDF for stair treads?

For MDF treads and risers, a slightly different approach is needed. No pre-drilled holes are needed for MDF, as it is recommended to use special MDF screws. These have the added benefit of not splitting the MDF board, as can occur when drilling pilot holes or using unsuitable screws.

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What is code for stair stringer spacing?

Cut stringers should be spaced no more than 18 inches on center. For example, a 36-inch-wide stairway should have three stringers. If the stairway is wider than 36 inches, four stringers should be installed.

How many stairs before you need a landing?

– A landing is required every 12′ of vertical stairway rise. – The landing should be at least as wide as the stairway that it serves.

How long can a stair run be?

The maximum length of a run of stairs is not measured in the number of risers, treads, or length of the stringer. It is defined by the International Residential Code (IRC) and Florida Building Code (FBC) as a maximum of 147 inches (12′-3”) of vertical height between floor levels or landings.

Should stair treads or risers be installed first?

Some contractors prefer installing the riser first, then installing the tread against the riser, fastening the riser to back edge of the tread with screws (Diagram A). Others prefer to place the tread first and place the riser on top of the tread, for additional support (Diagram B). dictated by jobsite conditions.

What is the minimum stair tread thickness?

As you may have noted from the sketches and text above, typically building codes for stairs specify minimum stair tread thickness ( 1″ if supported by a riser at front, or 1 1/2″ thick treads if the stairs are open-construction without risers), but they do not specify a maximum allowable tread thickness.

Should stair treads be glued?

Don’t fasten treads and or risers with only nails or staples. The adhesive is much more important than the fasteners. There will be times when fastening may be limited, so a good adhesive is critical. Don’t use the stringer as a level for the treads.

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