Sub-framing layout
Provide solid backing or furring with integrated flashing; confirm fastener spacing for the selected board and exposure.
THERMOStart your projectBUILDERS FIRSTSOURCE · ISSAQUAHGet a local Maximo consultation
Architectural Millwork & Exterior Trims · CSI 06 40 00 - Architectural Woodwork
Thermally ModifiedTrim & Moulding.
Complete window surrounds, corners, roof fascias, and exterior privacy screens with dimensionally stable S4S boards in sizes ranging from 2x2 battens up to 1x12 wide fascias.
ARCHITECTURAL APPLICATIONTrim & Moulding · CSI 06 40 00 - Architectural Woodwork
11Catalog profiles
Class 1 or 2Product-dependent durability
20 YearMaximo warranty
Heat + SteamNo added wood preservatives
Airflow & drying plane
Provide back-ventilation behind wide fascia boards and architectural trims
Corrosion resistance
Use exterior-grade stainless steel finish screws or trim fasteners and pre-drill as directed.
Moisture defense
Back-bevel bottom edges of exterior trim to create positive drip edges
Pacific Northwest project planning
Detail for drainage,
drying & seasonal change.
Wide trim can be sensitive to uneven moisture exposure. Thermal modification reduces movement, while backing, flashing, fastener placement and finish help control 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
11 Profiles engineered for
trim & moulding.
Select a specific model to inspect dimensions, species characteristics, and compare side-by-side with traditional Pacific Northwest woods.
Thermo Ash2x4 S4S E4EHardwood strength and dimensional stability in a versatile structural-looking profile.View application details →
Thermo Ash2x6 S4S E4EA broad, solid profile with strong grain for decking, trim and architectural details.View application details →
Thermo Ash1x10 S4S E4EA wide hardwood trim board for fascia, frames and refined exterior transitions.View application details →
Thermo Ayous1x8 S4S E4EA lightweight wide board suited to fascia, trim and modern architectural detailing.View application details →
Thermo Ayous1x10 S4S E4EA broad, smooth trim board with warm tone and low installed weight.View application details →
Thermo Ayous2x2 S4S E4EA compact square profile for battens, screens and precise finish work.View application details →
Thermo Ayous2x4 S4S E4EA stable, lightweight profile for trims, frames and dimensional accents.View application details →
Thermo Ayous2x6 S4S E4EA wider dimensional profile combining architectural presence with easy machining.View application details →
Thermo Clear Radiata2x6 S4S E4EA substantial clear profile for clean-lined decking and matching architectural trim.View application details →
Thermo Clear Radiata1x8 S4S E4EA wide, minimal-knot trim board for contemporary fascia and transitions.View application details →
Thermo Clear Radiata1x12 S4S E4EThe widest clear trim profile in the catalog for bold fascia and uninterrupted planes.View application details →Side-by-side comparisons
Compare with traditional lumber
for trim & moulding.
COMPARISON GUIDE
Vertical Grain Hemlock vs. Thermo Trim & Moulding
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 Trim & Moulding
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 Trim & Moulding
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 Trim & Moulding
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.
Trim & Moulding FAQs
Architectural &
installation questions.
What sizes are available for Maximo Thermo trim boards?+
Profiles range from 2x2 battens up to 1x12 wide boards in Thermo Ash, Thermo Ayous, and Thermo Clear Radiata.
Product documents & submittals
Architectural specification documents, submittal packages, and sample kits are available through Builders FirstSource Issaquah.