AWS EDITION 1, 2009

328

© 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



4.4

A S S E M B L Y

ASSEMBLY (continued)



4.4.3

Of JOINTS at ASSEMBLED WOODWORK shall (continued)

4.4.3.9 Require GAPS at exposed surfaces when mitered or butted (see Test C illustrations in

COMPLIANCE) not exceed:

4.4.3.9.1 At INTERIOR, 0.05” (1.3 mm).

4.4.3.9.2 At EXTERIOR, 0.025” (0.6 mm).

4.4.4 Of MOLDINGS shall be:

4.4.4.1 Mitered.

4.4.4.2 Spot glued and mechanically fastened.

4.4.4.2.1 Only to non-panel surfaces; panels ARE required to float.

4.4.4.2.2 With a maximum of two positioning nails per 12" (300 mm) of length before a joint.

4.4.4.2.3 With nails set, filled, and sanded.

4.4.5 Of MITER JOINTS shall be well fitted and cleaned.

4.4.6 Of BUILT-UP ITEMS shall be soundly fabricated with half-lapped, mitered, shoulder-mitered, tonged, or

equivalent construction.

4.5

S T R I P P I N G

STRIPPING

4.5.1 COATING STRIPPERS shall be environmentally approved.

4.5.2 BEFORE STRIPPING procedures begin, all surfaces shall be tested (with the process and results recorded) to

provide the least intrusive and damaging methods, and:

4.5.2.1 Approval by the design professional or conservator is required for the selected method.

4.5.2.2

HEAT-BASED methods of coating removal are permitted, provided the recommendations found in

the National Park Service - Preservation Brief 10 Exterior Paint Problems On Historic Woodwork are

followed.

4.5.3 Completely gouging, splintering, or otherwise damaging sound wood.REMOVE EXISTING FINISH using multiple applications of stripper and hand scrapers without

4.5.4 STRIPPING RESIDUALS shall be thoroughly removed, including wax.

4.5.4.1 STRIPPED SURFACES shall be tested for evidence of ACID and ALKALI, and:

4.5.4.1.1 All stripped surfaces found not to be pH neutral shall be neutralized and retested.

4.5.4.1.2 A written to the design professional.SUMMARY REPORT, including before and after pH levels, shall be submitted

4.5.5 SANDgrain. all surfaces by hand with steel wool and the appropriate grit sandpaper to remove all signs of raised

4.5.6 SEAL all exposed surfaces with an approved sanding sealer.

4.6 REPAIRS shall:

4.6.1 MATCH EXISTING for recommended methods of repair by governing authorities.

4.6.2 For TRANSPARENT FINISH, be made with wood of the same species, grade, cut, color tone, and grain pattern.

4.6.3 Use the same CARPENTRY METHODS exhibited in the existing work.

4.6.4 Use nonferrous FASTENERS, and:

4.6.4.1 Dissimilar metals shall be isolated from one another.

4.6.5

Use WOOD PATCHES of boat- and/or diamond-shaped so as to minimize those joint surfaces at 90 degrees to

the member’s grain direction.

4.7 FINISHING shall:

4.7.1 Comply with Section 5 as modified by the plans and specifications.

4.7.2 Use APPLICATIONS and TECHNIQUES best-suited to match the existing and/or desired finish.

Section 12 - Historic Restoration Work (Page 7 of 12)

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