Sub-framing layout
Provide a level support plane and confirm spacing for the selected profile and interior or exterior condition.
THERMOStart your projectBUILDERS FIRSTSOURCE · ISSAQUAHGet a local Maximo consultation
Overhead Architectural Finishes · CSI 09 54 23 - Open Cell & Linear Wood Ceilings
Thermally ModifiedCeilings & Soffits.
Connect interior spaces with covered outdoor areas using a coordinated wood ceiling language. Lightweight and interlocking profiles create defined overhead lines when the support and ventilation details are correct.
ARCHITECTURAL APPLICATIONCeilings & Soffits · CSI 09 54 23 - Open Cell & Linear Wood Ceilings
9Catalog profiles
Class 1 or 2Product-dependent durability
20 YearMaximo warranty
Heat + SteamNo added wood preservatives
Airflow & drying plane
Exterior soffits require continuous perimeter or strip ventilation to prevent heat and moisture trapping
Corrosion resistance
Use the stainless fastener type and placement allowed by the current profile instructions.
Moisture defense
Coordinate perimeter clearances, penetrations and exterior edge details with the assembly design.
Pacific Northwest project planning
Detail for drainage,
drying & seasonal change.
Covered soffits can still be exposed to humidity, wind-driven rain and condensation. Thermal modification reduces moisture uptake, while support, ventilation and finish determine the installed result.
Thermal modification reduces moisture uptake and seasonal movement compared with the same species untreated. Tight joints, secure fasteners and finish life still depend on acclimation, correct installation, drainage and maintenance.
Thermal modification reduces dimensional movement; compare product-specific data for the selected materials.
Modified with heat and steam, without added wood-preservative chemicals or plastic resins.
Ask BFS Issaquah about available colors, coverage, samples and field touch-up requirements.
Use current catalog, warranty and installation documents for the exact profile.
Cataloged Maximo profiles
9 Profiles engineered for
ceilings & soffits.
Select a specific model to inspect dimensions, species characteristics, and compare side-by-side with traditional Pacific Northwest woods.
Thermo Ash1x6 Plus S4S E4E End MatchA dense thermally modified hardwood with pronounced grain and a deep, architectural tone.View application details →
Thermo Ash5/4x6 S4S E4E End MatchA substantial end-matched board built for bold surfaces and high-use exterior spaces.View application details →
Thermo Ayous1x6 S4S E4ELightweight, smooth and evenly toned for clean siding, ceiling and wall installations.View application details →
Thermo Ayous1x6 V-Joint / Nickel GapA crisp tongue-and-groove profile that creates controlled shadow lines with easy handling.View application details →
Thermo Ayous1x6 Fluted #5A rhythmic fluted surface that adds texture while keeping Ayous light and workable.View application details →
Scandinavian Thermo1x6 V-Joint / Nickel GapStraight grain, characteristic knots and a clean Nordic tongue-and-groove expression.View application details →
Scandinavian Thermo1x6 Fluted #5Textured Nordic softwood with distinctive grain and a contemporary fluted face.View application details →
Scandinavian Thermo5/4x6 S4S E4EA versatile Nordic profile for clean horizontal or vertical surfaces and decking.View application details →
Thermo Clear Radiata1x6 Nickel Gap / Square BackA clear, uniform softwood profile designed for minimal knots and precise shadow lines.View application details →Side-by-side comparisons
Compare with traditional lumber
for ceilings & soffits.
COMPARISON GUIDE
Vertical Grain Hemlock vs. Thermo Ceilings & Soffits
Familiar machining and a refined look when the grade and moisture are well controlled. Compare maintenance, moisture uptake, and warranty in Issaquah.
Read comparison →
COMPARISON GUIDE
Vertical Grain Cedar vs. Thermo Ceilings & Soffits
Naturally durable heartwood and a long architectural track record in the Pacific Northwest. Compare maintenance, moisture uptake, and warranty in Issaquah.
Read comparison →
COMPARISON GUIDE
Western Red Cedar vs. Thermo Ceilings & Soffits
Naturally durable heartwood, low density and established exterior applications. Compare maintenance, moisture uptake, and warranty in Issaquah.
Read comparison →
COMPARISON GUIDE
Douglas Fir vs. Thermo Ceilings & Soffits
High structural strength, broad familiarity and availability across common construction grades. Compare maintenance, moisture uptake, and warranty in Issaquah.
Read comparison →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.
Request a local quote
Put this profile
on your project.
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.
Ceilings & Soffits FAQs
Architectural &
installation questions.
Can thermally modified wood be used for interior ceilings as well as exterior soffits?+
Several Maximo Thermo profiles are cataloged for ceiling applications. Confirm the selected finish, fire classification, fastening and indoor-air documentation required for the project.
Product documents & submittals
Architectural specification documents, submittal packages, and sample kits are available through Builders FirstSource Issaquah.