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Project guidance · Testing & approvals
Fire performance.Specified honestly.
Wood products should not be assigned a flame-spread class or Wildland-Urban Interface approval by assumption. Start with the exact Maximo species, profile, finish and assembly, request the applicable test report, and coordinate the result with the project’s design professional and building official.
CODE & ASSEMBLYTest reports · assembly details · local review
01
Project detail
Start With the Exact Test Report
Species, profile, finish and test configuration all matter
ASTM E84 and UL 723 reports describe flame-spread and smoke-developed results for the material and mounting method that were tested. A rating from one species, thickness, coating or treatment should not be transferred automatically to another product.
Before a fire classification appears in the specification, obtain current documentation that identifies the exact Maximo product or a clearly applicable tested assembly. The project code professional should confirm how the report applies to the proposed use.
02
Project detail
Fire-Retardant Options
Confirm availability and tested performance before design commitment
Some projects require a different fire classification than an untreated wood profile can document. Do not assume that a pressure treatment or intumescent coating is available, compatible or sufficient for every Maximo product.
Contact Builders FirstSource Issaquah early to request current options, samples, test reports and lead times. The finish, fasteners and assembly may need separate compatibility review.
03
Project detail
WUI & Local Code Review
Map the proposed product to the adopted requirements
Whether WUI provisions apply depends on the project location, occupancy, adopted code and local mapping. Exterior walls, soffits, decks and openings may be evaluated under different requirements.
Submit the proposed wood product together with the complete assembly and supporting test documentation. A backing layer, coating or fire treatment should only be described as compliant when the code path has been confirmed for that jurisdiction and project.
Coordinate early
Include the weather barrier, furring, cladding profile, finish, fasteners and any fire-resistive layers in the wall-section review. Early confirmation helps avoid selecting a finish or profile that lacks the required documentation.
04
Project detail
Coordinate the Complete Assembly
A product rating is only one part of the design
Cladding thickness, joints, cavities, membranes, insulation, backing materials and openings can all affect fire behavior. Do not use a generic wood charring rate or a surface-burning result as a substitute for the required assembly evaluation.
Keep the approved product report and wall details in the submittal package, and verify that field substitutions—including coatings—do not invalidate the selected compliance path.
Keep the project moving
Choose the detail
you need next.
Where to buy in Issaquah
Builders FirstSource Issaquah
Catalog available by consultation. Contact the Issaquah team to confirm availability, sample kits, and lead time for your selected Maximo profile.
Issaquah, WA 98029
(425) 391-8000
Monday–Friday, 7:00 AM–4:00 PMDealer information verified August 31, 2026. No in-stock claim is made on this site.
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Tell us what you are building. Our team will review your wood selection and contact you to coordinate a Maximo consultation with Builders FirstSource Issaquah.
Frequently Asked Questions
Common project
questions
Does thermal modification make wood more flammable?+
Thermal modification changes the wood, but fire performance must be established by applicable testing. Do not infer that the product is better or worse than standard kiln-dried wood without a report covering the exact material and use.
Can I get a Class A fire rating certificate for commercial interior ceilings?+
Ask Builders FirstSource Issaquah for current product-specific options and documentation. Availability, compatibility and classification must be confirmed before the material is specified or ordered.
Product and installation references