Summary of Design Elements/UL Listings of Hacker Floor Underlayments

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UL Design Number FIRM-FILL®
Underlayment Thickness
Number of Hours Subfloor Joists Resilient or Furring Channels Gypsum Board Batts & Blankets
G230 1″ 2 Midcon Metal Edge, T&G plant Steel Joist, 48″ OC
G516 1″ 2 Midcon Metal Edge, T&G plant Steel Joist, 48″ OC x 5/8″
G524 1″ 1-2 Hambro Structural Systems Composite steel joists, min nom depth 6:, 49-1/4″ oc, max depth 10″ x 1/2″ or 5/8″
G553 1″ 1-2 Steel Deck-Min 9/16″ deep, 22MSG galv corrugated fluted steel deck Channel-shaped, 9-1/4″min depth, Min No. 16 MSG galv steel. Max 24″ oc x 5/8″
G561 1″ 1-3 Galv. Fluted steel floor units Composite or noncomposite steel joist, spaced 48″ oc, Min 10″ deep (2)5/8″
G565 1″ 2 Steel Deck-Min 9/16″ deep, 22MSG galv corrugated fluted steel deck Channel-shaped, 9-1/4″min depth, Min No. 16 MSG galv steel, 24″ oc x (2)5/8″
G566 1″ 1-2 Steel Deck-Min 9/16″ deep, 28MSG galv corrugated fluted steel deck Pre fab steel truss, depth min. 12″, 24″ oc.
G568 1″ 1 Steel Deck-Min 9/16″ deep, 24MSG galv corrugated fluted steel deck Channel-shaped, Min. 9-1/4″ depth, Min. No. 16 MSG galv steel, 24″ oc
G587 1″ 1-1/2 Steel Deck-Min 9/16″ deep, 24MSG galv corrugated fluted steel deck Total Joist, Min. 7-1/2″ deep, 20 GA min. thickness, 24″ oc
G595 1″ 2 Precast Concrete
J917 1/2-1″ 2 Precast Concrete
J919 3/4″ 2-4 Precast Concrete
J920 3/4″ 2-3 Precast Concrete
J924 1/2-3/4″ 2-4 Precast Concrete
J927 3/4″ 2 Precast Concrete
J931 1/2″ 2-3 Precast Concrete
J957 1/2″ 2-4 Precast Concrete
J991 1/2-1″ 1-4 Precast Concrete
J994 1/2-1″ 2 Precast Concrete
L006 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc (2) 5/8″
L201 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc
L202 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels Nom. 9×10″ wood joists, 16″ oc
L206 1″ 1 15/32″ plywood wood structural panels Nom. 9×10″ wood joists, 16″ oc 1/2″
L208 1″ 1-1/2 1×4″ T&G or 5/8″ plywood 3×8″, 16″ oc
L209 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc
L210 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc
L211 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc
L212 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc
L501 3/4″ 1 19/32″ wood structural panels 2×10, 16″ oc 5/8″
L502 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc 1/2″
L503 1″ 1 1×6″ T&G or 15/32″ plywood or 7/16″ OSB wood structural panels 2×10, 16″ oc 1/2″
L504 3/4″ or 1″ 1 5/8″ structural interior with exterior glue, C-D Grade Douglas fir plywood Stingers 12″ oc of 1200-psi graded lumber measuring 1-11/16 by 5-1/4″ or greater 1/2″
L505 3/4″ 2 19/32″ wood structural panels, 15/32″ wood structural panels 2×10, 16″ oc (2) 5/8
L506 1″ 3/4 1×6″ T&G or 1/2″ wood structural panel 2×10, 16″ oc 1/2″
L507 1″ 1 2×4″ blocking under side joints 2×10, 16″ oc 1/2″
L508 3/4″ 1 Nom. 1-1/8″ thick wood structural panels, min. grade “Underla 4×10 or (2) 2×10 wood joists, 12″oc x 5/8″ Optional
L509 1″ 1/2* 1×6″ T&G or 1/2″ wood structural panel 2×10, 16″ oc 1/2″
L510 3/4″ 1.5* 1×6″ T&G 2×10, 16″ oc x (2) 1/2″
L511 3/4″ or 1″ 2 19/32″ wood structural panels, 15/32″ wood structural panels 2×10, 16″ oc (2) 5/8″
L512 3/4″ 1 19/32″ wood structural panels 2×10, 16″ oc 1/2″ or 5/8″
L513 3/4″ 1 3/4″ wood structural panels 2×10, 16″ oc 5/8″
L514 3/4″ 1 19/32″ wood structural panels 2×10, 16″ oc 1/2″ or 5/8″
L515 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc x 5/8″ Optional
L516 3/4″ 1 1×6″ T&G or 15/32″ plywood 7/16″ OSB wood structural panels 2×10, 16″ oc x 5/8″ Optional
L517 3/4″ 1 1×6″ T&G 2×10, 16″ oc 1/2″
L518 3/4″ 1 19/32″ wood structural panels/td> TRUS JOIST or TJI x (2) 1/2″
L519 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc 1/2″
L520 3/4″ 3/4* 5/8″ thick plywood 2×10, 16″ oc x 5/8″ 3″ thick
L521 3/4″ 1 23/32″ wood structural panels Parallel chord truss, 24″ oc x 5/8″ Optional
L522 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc 1/2″
L523 1″ 1 5/8″ thick plywood 2×10, 16″ oc Optional 5/8″
L524 3/4″ 1 19/32″ wood structural panels Steel joists with 7″ min. depth, 24″ oc (2) 5/8″
L525 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc 1/2″
L526 1″ 1 1×6″ T&G or 15/32″ plywood wood structural panels 2×10, 16″ oc 1/2″
L527 3/4″ 1.5* 3/4″ thick plywood, min grade “Underlayment Steel joists with 9-3/8″ min. depth, 24″ oc x 5/8″
L528 3/4″ 1 23/32″ wood structural panels Parrallel chord truss, 24″ oc x 5/8″
L529 3/4″ 1 23/32″ wood structural panels Parrallel chord truss, 24″ oc 5/8″
L530 3/4″ 1 3/4″ plywood TRUS JOIST or TJI x 1/2″ or 5/8″ 1-1/4″ thick
L533 3/4″ 1 4×8″ x 5/8″ thick wood structural panels 2×10, 16″ oc x 5/8″ Optional
L534 3/4″ 1 23/32″ plywood wood structural panels Parallel chord truss, 24″ oc x 5/8″
L535 3/4″ 1 19/32″ wood structural panels 2×10, 16″ oc x 1/2″ or 5/8″
L536 1″ 2 15/32″ wood structural panels 2×10, 16″ oc (2) 5/8″
L537 3/4″ 1 5/8″ thick plywood 2×10, 16″ oc 1/2″ or 5/8″
L538 3/4″ 2 1/6″ T&G or 15/32″ plywood or 7/16″ OSB Min. 14″ deep wood and steel truss, 19.2″ oc x (3) 5/8″
L539 3/4″ 1 1×6″ T&G or 15/32″ plywood 2×10, 16″ oc 5/8″ Optional
L540 3/4″ 1 1×6″ T&G or 15/32″ plywood 2×8 wood joists, 16″ oc 5/8″ Optional
L541 1-1/2″ 2 15/32″ plywood wood structural panels 2×10, 16″ oc x 5/8″ 3″ thick
L542 1″ 1 23/32″ wood structural panels, min grade “Underlayment Parallel chord truss, 24″ oc (2) 1/2″
L543 3/4″ 1 Nom. 23/32″ wood structural panels, min grade “Underlayment” C-shaped sections, min 8″ deep, 1-9/16″ flanges (2) 1/2″
L545 3/4″ 1 3/4″ wood structural panels 2×10, 16″ oc x 5/8″ Optional
L546 3/4″ 1 15/32″ wood structural panels Parallel chord truss, 24″ oc with nom 2×4 lumber. Min. truss depth 18″ x 5/8″ Optional
L547 3/4″ 1.5* 5/8″ thick plywood Min. 9-1/2″ deep “I” shaped joist, max 19.2″ oc x (2) 1/2″ Optional
L549 3/4″ 1 23/32″ wood structural panels Pre-fab light gauge steel truss max 48″ oc x 5/8″ Optional
L550 3/4″ 1 23/32″ wood structural panels Parallel chord truss, 24″ oc x 5/8″ Optional
L551 3/4″ 1 23/32″ wood structural panels Pre-fab light gauge steel truss max 48″ oc x 5/8″ Optional
L552 3/4″ 1 23/32″ T&G plywood Pre-fab light gauge steel truss max 48″ oc x 5/8″ Optional
L556 1″ 2 23/32″ wood structural panels Channel-shaped steel joist, min 8″ deep, min. 18 MSG galv steel, 24″ oc x (4) 5/8″
L556 1″ 2 23/32″ wood structural panels Min. 9-1/4″ deep “I” shaped wood joist, 24″ oc x (4) 5/8″
L556 1″ 2 23/32″ wood structural panels 2×8 or 2×10, 24″ oc x (4) 5/8″
L557 3/4″ 1 15/32″ wood structural panels 2×10, 16″ oc 5/8″
L558 3/4″ 1 23/32″ wood structural panels Parallel chord truss, 24″ oc x 5/8″ x
L560 3/4″ 1 23/32″ wood structural panels Pre-fab light gauge steel truss max 48″ oc x 5/8″ Optional
L562 3/4″ 1 23/32″ T&G wood structural panels Parallel chord truss, 24″ oc with nom 2×4 lumber, truss depth 18″ x 5/8″ 3-1/2″
L563 3/4″ 1 23/32″ T&G wood structural panels Parallel chord truss, 24″ oc with nom 2×4 lumber, truss depth 18″ x 5/8″ Optional
L564 3/4″ 1 Viroc Structural Cement-Fiber Units Metal Joist x 5/8″ x
L565 3/4″ 1 23/32″ wood structural panels Pre-fab light gauge steel truss, 48″ oc x 5/8″ Optional
L569 3/4″ 1 15/32″ plywood wood structural panels 2×10, 16″ oc x 5/8″ Optional
L570 3/4″ 1 19/32″ wood structural panels Min. 9-1/2″ deep “I” shaped joist, max 24″ oc x (2) 1/2″ or (2) 5/8″ Optional
L571 3/4″ 1 5/8″ T&G structural panels Min. 9-1/4″ JSI 4000 I shaped joist, 24″ oc x 5/8″ 2-1/2″
L573 3/4″ 1 3/4″ thick plywood, min grade “Underlayment Channel-shaped, 9-3/8″ min depth, Min No. 16 MSG galv steel, Max 24″ oc (2) 5/8″
L574 3/4″ 1 23/32″ T&G plywood Parallel chord truss, 24″ oc x 5/8″ Optional
L576 3/4″ 1 23/32″ plywood wood structural panels Parallel chord truss, 24″ oc x 5/8″ 3-1/2″
L577 3/4″ 2 19/32″ wood structural panels Parallel chord truss, 24″ oc x (3) 5/8″ x
L579 3/4″ 1 19/32″ wood structural panels Parallel chord truss, 24″ oc x 5/8″ Optional
L581 3/4″ 1 3/4″ plywood Min. 9-1/2″ deep “I” shaped joist, max 24″ oc (2) 5/8″ x
L581 3/4″ 1 3/4″ plywood 2×10, 16″ oc (2) 5/8″ x
L583 3/4″ 1 3/4″ plywood Min. 9-1/2″ deep “I” shaped joist, max 24″ oc x (2) 5/8″ x
L583 3/4″ 1 3/4″ plywood Parallel chord truss, 24″ oc x (2) 5/8″ x
L583 3/4″ 1 3/4″ plywood 2×10, 16″ oc x (2) 5/8″ x
L585 3/4″ 1 23/32″ T&G wood structural panels Parallel chord truss, 24″ oc with nom 2×4 lumber. Min. truss depth 18″ x 5/8″ Optional
L587 3/4″ 1 23/32″ wood structural panels Parallel chord truss, 24″ oc x 5/8″ Optional
L588 3/4″ 1 15/32″ wood structural panels 2×10, 16″ oc/td> 5/8″
L589 3/4″ 1 19/32″ wood structural panels Min. 9-1/2″ deep “I” shaped joist, max 19.2″ oc/td> x (2) 1/2″ or (2) 5/8″ x
L590 3/4″ 1 15/32″ wood structural panels 2×10, 16″ oc/td> x 5/8″ Optional
L592 3/4″ 1 23/32″ plywood wood structural panels Parallel chord truss, 24″ oc/td> x 5/8″ Optional
L593 3/4″ 1 15/32″ wood structural panels 2×10, 16″ oc/td> 5/8″
L598 3/4″ 1 5/8″ plywood wood structural panels 2×10, 16″ oc/td> x 5/8″ 3-1/2″ thick
M500 3/4″ 1 19/32″ wood structural panels Parallel chord truss, 24″ oc (3) 5/8″
M502 3/4″ 1 19/32″ wood structural panels Min. 9-1/2″ deep “I” shaped joist, max 19.2″ oc x (2) 5/8″ Optional
M503 3/4″ 1 23/32″ T&G plywood Parallel chord truss, 24″ oc x 5/8″ x
M504 3/4″ .75 19/32″ wood structural panels 2×10, 16″ oc 5/8″
M505 3/4″ 1 19/32″ wood structural panels Steel joist with 8″ deep, min. 1-5/8″ flanges, min. 9/16″ stiffening flanges (1) 5/8″ with RC, (2) 5/8″ without RC 3-1/2″ thick
M506 3/4″ 1 19/32″ wood structural panels Min. 9-1/2″ deep “I” shaped joist, max 19.2″ oc x (2) 1/2″ or (2) 5/8″ Optional
M508 1″ 1 23/32″ T&G wood structural panels Parallel chord truss, 24″ oc x 5/8″ Optional
M511 3/4″ 1 3/4″ plywood Steel joist with min 10″ deep, 18 GA, spaced 24″ oc x 5/8″ 3″ thick
M512 7/8″ 1 23/32″ T&G plywood Min. 18″ I-joist, spaced 24″ oc x 5/8″
M515 3/4″ 1 3/4″ T&G plywood Steel joists with 7″ min. depth, 24″ oc x 5/8″ x
M519 3/4″ 1 15/32″ plywood wood structural panels 2×10, 16″ oc Optional 5/8″ Optional