What are Jji joists?

What are Jji joists? A JJI-Joist is a composite engineered timber joist, combining 45mm deep high-grade finger jointed softwood flanges with a 9mm thick oriented strand board (OSB/3) web. The JJI-Joist relies on a unique combination of engineered products designed to complement each other and deliver outstanding performance.

What does Jji joist stand for? A JJI-Joist is a composite engineered timber joist combining 45mm deep high-grade finger-jointed softwood flanges with a 9mm thick oriented strand board (OSB) web. The solid timber flanges and OSB web make the JJI-Joist easier to work with on site.

What are the two types of joists? Types of Joists

Two types of engineered joists are most frequently used in floor systems today: Wood I-Joists with dimension lumber top and bottom chords and OSB web.

What is an engineered timber joists? An I-Joist is an engineered wood joist, designed to eliminate the problems that occur when using traditional timber joists. The joists are shaped like an “I” and are lightweight, but strong. An I-joist has two main parts, the web and flange. The web is sandwiched between a top and bottom flange, creating the “I” shape.

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What are Jji joists? – Related Questions

What are timber joists made of?

The timber joist has an I-shaped cross-section comprising top and bottom flanges made of softwood or LVL (laminated veneer lumber) fixed to a tall vertical web of OSB (oriented strand board) or similar. I-Joists are lightweight and easy to handle. They are incredibly strong in relation to their size and weight.

Are I joists stronger than timber?

Are I joists stronger than timber? They can span greater distances, and are considered to be 50% stiffer than dimensional timber under traditional frame spacing. Unlike timber, the strength of an I joist is not affected by cut holes that are used to run plumbing.

Is I joist stronger than level?

The LVL keeps the I-joists in place and gives additional support for the floor. Like the I-joists, the LVL will not bow, crown, or split. The composition of the wood is much stronger than traditional lumber, and therefore can be relied on more.

How far can a floor joist span without support?

The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12′-6”, ceiling joist 20′-8”, rafter 18′-0”, deck board 24”, deck joist 9′-11”, deck beam 8′-3”, and 6′-1” as for header. Always check the codes for determining factors or consult a Structural Engineer.

Where are joists in a house?

A joist is a structural member that spans horizontally between the foundations of a building, or between walls or structural beams.

Where are I joists used?

I-joists are used extensively in residential floor and roof framing. They are ideal for long spans, including continuous spans over intermediate supports. Because I-joists are straight and true, it’s easier for builders to avoid crowning and maintain a level framing surface.

Do I joists have a top and bottom?

An I-joist has two main parts, the web and flange. The web is sandwiched between a top and bottom flange, creating the “I” shape. The flange can be made from laminated veneer lumber or solid wood finger-jointed together for ultimate strength.

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How strong are engineered joists?

In addition to being flat and straight, engineered studs are strong. Laminated veneer lumber (LVL) studs can be two times stronger in compression and tension than standard framing lumber of the same dimension.

What wood is used for floor joists?

Wood Species

The common types of wood used to make floor joists are redwood, hemlock, Douglas fir, and southern yellow pine. However, not every type of wood product is available across the country. It’s important to understand the strength differences between wood types when choosing joist material.

What type of wood is best for floor joists?

Lumber Grade

Lumber graded as #2 is the most common choice for floor joists and other framing lumber. It has more knots and defects than higher grades, but usually not enough to cause significant loss of bending strength.

What goes under floor joists?

What Is a Subfloor? Subflooring provides a base for finish flooring and also serves as a platform during construction. It may be made of boards laid either at right angles or diagonally across joists. Or the subfloor may be made of plywood or other panel products that are laid perpendicular to the joists.

Are floor trusses stronger than joists?

Span longer distances than traditional joists, removing the need for walls in some areas. Lighter weight. Stronger than traditional joists. Wider nailing surface (making the building process easier)

What is the maximum joist span?

In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. The larger the deck, the larger the joists.

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Are posi joists expensive?

Posi joists have an initially higher cost than I-joists because they are manufactured to order using specialist equipment to meet customers’ requirements. However, a metal web joist’s ability to span greater distances than I-joists, coupled with its open web provides many cost saving advantages.

What is the strongest wood beam?

Power Beam® – 3000Fb – 2.1E – 300F

Power Beam® is the strongest engineered wood product (EWP) on the market with design values of 3000Fb – 2.1E – 300Fv. Power Beam® is manufactured with superior strength southern yellow pine MSR Lumber.

Are I-joists more expensive?

An I-beam engineered joist is composed of two different materials. They can span longer distances than other joists but cannot be cut or trimmed once fabricated. Truss joists are much more expensive than engineered I-beams. They are also substantially heavier, as they are all solid lumber plus metal plates.

What is the strongest engineered wood?

Laminated Veneer Lumber (LVL)

It is extremely strong and can hold heavy loads. This feature makes it an excellent building material for beams and structural construction. LVL can be crafted to be longer than a natural beam, and it has been engineered to hold heavier loads.

Is LVL heavier than wood?

Laminated veneer lumber (LVL) studs can provide ultimate strength against wind and shear-loads and can be up to two and a half times stronger than standard framing lumber of the same dimension in compression and tension, which means a wood-framed house can be designed and constructed to withstand 100 mph or more .

Can I use 2×6 for floor joists?

Residential Designer. According to the IRC 2009 for 16″ centers, 20 lb. dead load, 40 live. You can span about 9′ with your 2×6, if you care.

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