Sub-framing layout
Confirm joist spacing and loading for the selected profile before framing; coordinate joist protection with the project design.
THERMOStart your projectBUILDERS FIRSTSOURCE · ISSAQUAHGet a local Maximo consultation
Exterior Decking & Boardwalks · CSI 06 73 00 - Composite & Real Wood Decking
Thermally ModifiedDecking.
Maximo thermally modified decking offers the grain and feel of real wood with reduced moisture response. Select the exact approved profile, then coordinate framing, drainage, fastening, finish and maintenance.
ARCHITECTURAL APPLICATIONDecking · CSI 06 73 00 - Composite & Real Wood Decking
7Catalog profiles
Class 1 or 2Product-dependent durability
20 YearMaximo warranty
Heat + SteamNo added wood preservatives
Airflow & drying plane
Provide open drainage and airflow below and around the deck, with clearances appropriate to the site.
Corrosion resistance
Use an approved exterior stainless steel fastening system and pre-drill as directed.
Moisture defense
Set board spacing from the current profile instructions and provide positive drainage below the deck.
Pacific Northwest project planning
Detail for drainage,
drying & seasonal change.
Lower moisture response can make board movement more predictable through seasonal changes. Surface temperature, growth and traction still depend on color, exposure, drainage, cleaning and finish.
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
7 Profiles engineered for
decking.
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 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 →
Scandinavian Thermo5/4x6 S4S E4EA versatile Nordic profile for clean horizontal or vertical surfaces and decking.View application details →
Thermo Clear Radiata5/4x6 S4S E4ESmooth, consistent decking with thermally enhanced stability and approachable weight.View application details →
Thermo Clear Radiata2x6 S4S E4EA substantial clear profile for clean-lined decking and matching architectural trim.View application details →Side-by-side comparisons
Compare with traditional lumber
for decking.
COMPARISON GUIDE
Vertical Grain Hemlock vs. Thermo Decking
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 Decking
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 Decking
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 Decking
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.
Decking FAQs
Architectural &
installation questions.
Does thermally modified decking splinter or rot?+
Thermal modification can improve durability and stability, but real-wood decking still requires inspection and care. Confirm the selected product’s durability rating and warranty, and address any checking, splinters or surface growth during maintenance.
Product documents & submittals
Architectural specification documents, submittal packages, and sample kits are available through Builders FirstSource Issaquah.