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Structural Plywood I-Beams: Web, Flange, and Assembly
Structural plywood i beams use a thin plywood web between two flanges to carry the floor and the roof with less material, and the shape that puts the wood where the load needs it turns the light member into a stiff beam. The web that the builder cuts from the structural sheet resists the shear, while the flanges carry the bending. The right beam gives the span the strength of the deep section at the weight of the light one.
Structural Plywood I-Beams: the Concept
The i-beam works because the flanges take the tension and the compression at the top and the bottom, while the web holds them apart and carries the shear. The deep section that the builder forms from the thin web reaches the stiffness that the solid joist of the same weight cannot. The builder who understands the shape reaches the beam that the span needs.
The plywood web serves the shear better than the solid board, because the crossed veneers resist the split that the concentrated load sends through the thin section. The web that the builder glues between the flanges carries the force that tries to buckle it. The panel that stays flat gives the beam the straight web that the load trusts.
The Flange and the Web
The flange that the builder pairs with the plywood web needs the strength to carry the bending, so the solid lumber or the laminated veneer lumber that carries the continuous grain serves the top and the bottom. The web that the builder cuts from the plywood reaches the thin section that the shape needs, and the glue that bonds the web to the flange carries the shear between them. The paired flange and web give the beam its strength.
The groove that the flange carries seats the web, because the builder who plows the groove down the center of the flange reaches the joint that the glue fills. The flange that carries the groove and the web that seats to the full depth reach the beam that the load trusts. The grooved joint gives the beam the straight web.
Why Plywood for the Web
The plywood web carries the shear and the buckle resistance that the solid web cannot at the thin section, because the crossed veneers stiffen the panel against the local buckle. The builder who uses the structural sheet for the web reaches the thin member that carries the load without the split. The plywood web gives the beam the light section that the span asks for.
The panel that the web uses also resists the moisture that the site sends, because the exterior glue that bonds the veneers holds through the damp. The builder who stores the web dry and seals the cut edge reaches the beam that survives the build. The sealed web gives the beam the service that the floor asks for.
The web that the builder cuts from the sheet also lets the design run the wiring and the duct through the knockouts, because the thin panel that carries the hole keeps the beam strong when the hole stays in the middle. The builder who follows the knockout guide reaches the beam that the trade can pass through.
Making the Web from Plywood
The cut that the builder makes sets the web depth that the span needs, and the saw that carries the sharp blade keeps the edge square to the face. The builder who cuts the web to the depth that the design lists reaches the beam that carries the load, and the square edge that seats the groove closes the joint. The square cut gives the web the fit that the glue needs.
The knockout that the builder cuts follows the guide that the maker prints, because the hole that sits in the middle of the web keeps the beam strong. The builder who keeps the hole away from the flange and the end reaches the web that the load trusts. The placed hole gives the beam the service the trade needs.
The edge that the builder seals before the assembly keeps the web dry, because the cut edge that meets the glue and the damp drinks the water. The builder who primes the web edge reaches the joint that holds. The sealed edge gives the beam the life that the floor needs.
The Pattern and the Splice
The splice that the builder makes in the web needs the joint that carries the shear, so the panel that the builder laps or the joint that the design lists reaches the continuous web. The builder who keeps the splice away from the mid-span reaches the beam that the load trusts. The placed splice gives the web the strength.
The pattern that the builder nests on the sheet saves the stock, because the web that repeats across the floor comes from one layout. The builder who lays the pattern to the grain reaches the web that the fasteners and the glue trust.
Assembly and the Glue Line
The glue that the builder spreads in the groove carries the shear between the web and the flange, and the clamp that the builder sets holds the joint until the bond cures. The builder who spreads the structural adhesive and clamps the full length reaches the beam that works as one piece. The cured glue gives the beam the strength that the nails alone cannot.
The nail or the screw that the builder adds holds the web in the groove while the glue cures, and the fastener that the builder sets through the flange reaches the web. The builder who follows the spacing that the maker lists reaches the beam that the load trusts. The right fastener gives the joint its grip.
The jig that the builder builds keeps the flange square to the web, because the beam that the jig holds straight reaches the depth that the design sets. The builder who checks the square and the depth reaches the beam that the floor needs.
Glue and the Clamp
The clamp that the builder sets along the beam needs the even pressure that closes the joint, because the gap that the loose clamp leaves starves the glue line. The builder who spaces the clamp along the full length reaches the bond that carries the shear. The full clamp gives the beam the joint that holds.
The cure that the builder allows before the load follows the label, because the beam that the builder loads too soon slips at the glue line. The builder who waits the full cure reaches the beam that the floor trusts.
Span, Depth, and the Design
The depth that the builder sets follows the span and the load, because the deep beam that the builder forms from the thin web reaches the stiffness that the shallow beam cannot. The builder who reads the span table and the depth together picks the beam that meets the code. The depth that matches the span serves the floor.
The bearing that the builder leaves at the end also matters, because the beam that carries the load needs the seat that the wall or the header provides. The builder who checks the bearing length reaches the beam that the frame supports. The right bearing gives the beam its place.
The design that the engineer stamps sets the depth, the flange, and the spacing, and the builder who follows the stamped plan reaches the floor that the inspector accepts.
Storage and the Site
The beam that the builder stores on the level bearer stays straight, because the web that bows in the stack reaches the floor that the finish cannot hide. The builder who keeps the beam dry and flat until the install reaches the straight member that the span needs. The flat store gives the beam the line that the floor shows.
The site that the builder protects the beam from the weather keeps the glue and the web sound, because the wet flange that swells reaches the joint that opens. The builder who covers the stack reaches the beam that the floor trusts.
Frequently Asked Questions
Builders ask these questions about the plywood i-beam.
Can you make i-beams from plywood?
The plywood web that the builder glues between the flanges forms the beam, and the engineer stamps the design.
What is the web of an i-joist made from?
The plywood or the oriented strand board that carries the shear serves the web between the flanges.
What thickness is the plywood web?
The three-eighths to the half-inch serves the web, sized to the depth and the load.
Are plywood i-beams strong?
The deep section that the thin web forms carries the span with less material than the solid joist.
For the panel that carries the web and the frame, compare the stock at HYY, which runs Commercial Plywood for the web and Film Faced Plywood for the exposed joint.