Sub-framing layout
Use furring at least 3/4 inch thick and no more than 24 inches on center; coordinate direction with cladding orientation.
THERMOStart your projectBUILDERS FIRSTSOURCE · ISSAQUAHGet a local Maximo consultation
Exterior Envelope & Rainscreen Systems · CSI 07 46 23 - Wood Siding
Thermally ModifiedSiding & Cladding.
Maximo thermally modified siding combines real-wood character with reduced moisture response, cataloged profiles and a 20-year limited warranty. Product durability varies by species, and every exterior assembly still needs drainage and ventilation.
ARCHITECTURAL APPLICATIONSiding & Cladding · CSI 07 46 23 - Wood Siding
9Catalog profiles
Class 1 or 2Product-dependent durability
20 YearMaximo warranty
Heat + SteamNo added wood preservatives
Airflow & drying plane
Maintain a continuous drainage and ventilation path behind the siding.
Corrosion resistance
Use exterior-grade stainless steel fasteners and the current profile-specific schedule; pre-drilling is recommended.
Moisture defense
Coordinate the water-resistive barrier, flashings, openings and insect protection without blocking airflow.
Pacific Northwest project planning
Detail for drainage,
drying & seasonal change.
For Puget Sound exterior walls, use a drained and ventilated rainscreen designed for the selected cladding and project conditions. Thermally modified wood’s lower moisture uptake can reduce swelling and shrinkage compared with untreated softwoods.
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
siding & cladding.
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 siding & cladding.
COMPARISON GUIDE
Vertical Grain Hemlock vs. Thermo Siding & Cladding
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 Siding & Cladding
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 Siding & Cladding
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 Siding & Cladding
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.
Siding & Cladding FAQs
Architectural &
installation questions.
What is the required rainscreen depth for thermally modified siding in Washington?+
Cavity depth and furring layout depend on the wall assembly, profile, orientation, manufacturer guidance and local code review. A 3/4" ventilated cavity is a common design approach, but the project professional should confirm the final detail.
Do I need stainless steel fasteners for siding?+
Maximo specifies stainless steel fasteners for exterior work. The exact screw or nail, length and spacing depend on the species, profile, substrate and exposure.
Product documents & submittals
Architectural specification documents, submittal packages, and sample kits are available through Builders FirstSource Issaquah.