What is the Davis-Bacon prevailing wage for a insulator (heat & frost) in Washington?

There is no single figure. Active federal determinations for Washington publish 31 insulator (heat & frost) classification rates ranging from $39.50 to $75.37 per hour before fringe benefits. The rate that applies depends on the county, the type of construction and the wage determination incorporated into the contract.

How many counties in Washington have a published insulator (heat & frost) rate?

31 of the counties covered by active federal determinations list at least one insulator (heat & frost) classification.

Do these rates apply to state-funded projects?

No. These are federal Davis-Bacon rates, which apply to federally funded or assisted construction. Washington may set its own prevailing wage rates for state and locally funded work; the state law summary is on the Washington prevailing wage page.

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Insulator (Heat & Frost) prevailing wage rates in Washington

Federal Davis-Bacon rates published in 31 active determinations, 2026

Active federal Davis-Bacon determinations for Washington publish 31 insulator (heat & frost) classification rates, across 31 determinations covering 31 counties.
Those published base rates run from $39.50 to $75.37 an hour before fringe benefits. Which one applies to a job depends on its county, its construction type and the determination written into the contract.
Construction types covered: Building, Heavy, Highway.
Last determination revision affecting insulator (heat & frost) rates in Washington: 2026-05-20.

The official source: binding Davis-Bacon and Service Contract Act wage determinations are published by the U.S. Department of Labor at SAM.gov Wage Determinations. This site indexes them and links every determination to its official document - the determination incorporated into a contract governs.

This page collects every classification in Washington's active federal determinations that is a form of insulator (heat & frost) work (mechanical insulation and asbestos abatement work) and shows the rate published for it. Determinations name a classification the way the underlying union agreement or wage survey named it, so the wording varies between them; the rate and the fringe are reproduced exactly as published.

Published rates by determination

WA20260002 rev 2 · Building, Heavy, Highway · Benton, Franklin

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR	$44.51	22.89	SUWA2001-001 DOL wage survey rate

Official document: WA20260002 on SAM.gov.

WA20260003 rev 2 · Building · Asotin

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260003 on SAM.gov.

WA20260022 rev 1 · Building · Clallam

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-005 collectively bargained (union) rate

Official document: WA20260022 on SAM.gov.

WA20260027 rev 1 · Building · Grays Harbor

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-005 collectively bargained (union) rate

Official document: WA20260027 on SAM.gov.

WA20260028 rev 1 · Building · Island

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-003 collectively bargained (union) rate

Official document: WA20260028 on SAM.gov.

WA20260029 rev 1 · Building · Jefferson

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-005 collectively bargained (union) rate

Official document: WA20260029 on SAM.gov.

WA20260031 rev 1 · Building · Klickitat

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION ONLY)	$62.02	22.36	ASBE0036-002 collectively bargained (union) rate

Official document: WA20260031 on SAM.gov.

WA20260032 rev 1 · Building · Lewis

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-005 collectively bargained (union) rate

Official document: WA20260032 on SAM.gov.

WA20260034 rev 1 · Building · Mason

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-005 collectively bargained (union) rate

Official document: WA20260034 on SAM.gov.

WA20260036 rev 1 · Building · Pacific

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION)	$75.37	18.82	ASBE0007-005 collectively bargained (union) rate

Official document: WA20260036 on SAM.gov.

WA20260038 rev 1 · Building · San Juan

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR	$75.37	18.82	ASBE0007-002 collectively bargained (union) rate

Official document: WA20260038 on SAM.gov.

WA20260040 rev 1 · Building · Wahkiakum

Classification as published	Base rate	Fringes	Rate schedule
ASBESTOS WORKER/HEAT & FROST INSULATOR (PIPE INSULATION ONLY)	$62.02	22.36	ASBE0036-002 collectively bargained (union) rate

Official document: WA20260040 on SAM.gov.

WA20260102 rev 2 · Building · Benton

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260102 on SAM.gov.

WA20260103 rev 1 · Building · Chelan

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260103 on SAM.gov.

WA20260104 rev 2 · Building · Columbia

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260104 on SAM.gov.

WA20260105 rev 1 · Building · Cowlitz

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$39.50	14.21	SUWA2018-005 DOL wage survey rate

Official document: WA20260105 on SAM.gov.

WA20260106 rev 1 · Building · Douglas

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260106 on SAM.gov.

WA20260107 rev 2 · Building · Franklin

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260107 on SAM.gov.

WA20260108 rev 1 · Building · King

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260108 on SAM.gov.

WA20260109 rev 1 · Building · Kitsap

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260109 on SAM.gov.

WA20260110 rev 2 · Building · Pend Oreille

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260110 on SAM.gov.

WA20260111 rev 1 · Building · Pierce

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260111 on SAM.gov.

WA20260112 rev 1 · Building · Skagit

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260112 on SAM.gov.

WA20260113 rev 1 · Building · Snohomish

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260113 on SAM.gov.

WA20260114 rev 2 · Building · Spokane

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260114 on SAM.gov.

WA20260115 rev 2 · Building · Stevens

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260115 on SAM.gov.

WA20260116 rev 1 · Building · Thurston

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260116 on SAM.gov.

WA20260117 rev 2 · Building · Walla Walla

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260117 on SAM.gov.

WA20260118 rev 1 · Building · Whatcom

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260118 on SAM.gov.

WA20260119 rev 1 · Building · Yakima

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$75.37	18.82	ASBE0007-007 collectively bargained (union) rate

Official document: WA20260119 on SAM.gov.

WA20260120 rev 1 · Building · Clark, Skamania

Classification as published	Base rate	Fringes	Rate schedule
HEAT & FROST INSULATOR (INCLUDES DUCT, PIPE AND MECHANICAL SYSTEMS)	$62.02	22.36	ASBE0036-006 collectively bargained (union) rate

Official document: WA20260120 on SAM.gov.

Where to go next

Insulator (Heat & Frost) rates in every state · Washington prevailing wage and state law · Washington determinations by county · pay calculator

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