AWS EDITION 1, 2009

305

© 2009, AWI, AWMAC, WI - Architectural Woodwork Standards - 1st Edition, October 1, 2009

As may be updated by errata at http://www.awinet.org, http://www.awmac.com, or http://www.woodworkinstitute.com/awserrata/

PRODUCT

MATERIAL, MACHINING, AND ASSEMBLY RULES (continued)

DESCRIPTION E C P



4.2

M A T E R I A L

MATERIAL (continued)

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4.2.5

H

P

D

L

At HPDL: (continued)

4.2.5.2

Use of CONTINUOUS-PRESSURE LAMINATES (melamine and polyester-based) as an

alternative to HPDL is permitted, provided that they conform to the same physical properties and

thickness as required for HPDL.

4.2.5.3 CORE shall be a minimum of 3/4” (19 mm) particleboard, medium-density fiberboard, veneer core,

or otherwise approved engineered core, and:

4.2.5.3.1

At SINK TOPS and their SPLASHES, use of veneer core plywood with Type II

adhesive, industrial-grade particleboard or fiberboard with a 24-hour thickness swell

factor of 5% or less and a 24-hour water-absorption factor of 10% or less is required for

the entire countertop elevation and/or return elevation.

4.2.5.4 FIRE-RATED countertops require CLASS I FIRE-RATED HPDL and:

4.2.5.4.1 CORE, a minimum of 11/16” (17.5 mm) thick, Class I Fire Rated.

4.2.5.4.2 BACKING SHEET, a minimum of 0.028” (0.7 mm) high-pressure phenolic Class I Fire-

Rated.

4.2.6 At SOLID SURFACE shall be:

4.2.6.1 1/4” (6.4 mm) minimum thickness for use as wall panels, tub enclosures, or other vertical surfaces.

4.2.6.2 1/2” (12.7 mm) minimum thickness for countertops and back splashes.

4.2.7 At SOLID PHENOLIC shall be:

4.2.7.1

Minimum 3/4” (19 mm) thick composite of solid phenolic resins molded with a homogenous core of

organic fiber-reinforced phenolic and one or more integrally cured surfaces of compatible

thermoset nonabsorbent resins.

4.2.8 At EPOXY RESIN shall be:

4.2.8.1

Minimum 1” (25.4 mm) in thickness, uniform mixture throughout of epoxy resin, silica, organic

fillers, and inert hardeners with a satin, non-glare finish on the top surface.

4.2.9 At NATURAL/MANUFACTURED STONE shall be:

4.2.9.1 Minimum 3/4”(19 mm) in thickness.

4.3



MACHINING

4.3.1 Of CUTOUTS within a top, shall be made by either manufacturer or installer, and:

4.3.1.1 SINK cutouts shall not fall within 18” (457 mm) of a joint.

4.3.2 Prohibits TEAR-OUTS, KNIFE NICKS, or HIT-OR-MISS machining.

4.3.3 Prohibits KNIFE MARKS where sanding is required.

4.3.4 Requires SHARP EDGES to be eased with a fine abrasive.

4.3.5

W

O

O

D



At WOOD:

4.3.5.1 Occasional patches are allowed. M

4.3.5.2 For OPAQUE or TRANSPARENT FINISH, finger joints are permitted in solid lumber. M

4.3.5.3



SMOOTHNESS REQUIREMENTS (see Item 7.1 in COMPLIANCE) require:

4.3.5.3.1 TOP FLAT WOOD surfaces; those that can be sanded with a drum or wide belt sander:

4.3.5.3.1.1 Minimum of 15 KCPI or 100-grit sanding M

4.3.5.3.1.2 120-grit sanding M

4.3.5.3.1.3 150-grit sanding M

Section 11 - Countertops (Page 10 of 25)

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