Imperial & Metric Net
13/16" x 9-7/8" (21 mm x 251 mm)
THERMOStart your projectGet a quoteBUILDERS FIRSTSOURCE · ISSAQUAHGet a local Maximo consultation
Thermo Ash · Maximo 2026 Collection
1x10S4S E4E.
Thermo Ash 1x10 S4S E4E is a cataloged Thermo Ash profile modified with heat and steam. Thermal modification lowers moisture uptake and improves dimensional stability compared with untreated lumber. Maximo lists a 20-year warranty; confirm current terms and approved applications for the selected product.
REAL PROJECT · COLLECTION INSPIRATIONThermo AshSee the catalog below for the exact profile.
13/16" xNet Finished Size
ConfirmCoverage from project layout
ProjectSpecific waste allowance
20 YearMaximo warranty
Milling Details
Wide S4S E4E trim profile
Installation Protocol
Select stainless steel fasteners for the profile, substrate and exposure. Do not transfer the concealed-nailing detail for grooved Ayous siding to a square-edge board, decking or trim. · Maximo recommends pre-drilling for all fasteners; confirm the bit, fastener and edge distance for the selected profile
Catalog Applications
Trim & Moulding
From the Maximo project library
From the board to the whole space.
An outdoor room by the water
A real project from the Thermo Ash album. Confirm the selected decking profile and finish separately.
Texture in the light
Changing light reveals the depth of the profile.
An entrance with character
Wood makes the threshold feel like part of the interior.
Real projects, not exact-profile samples. Confirm the species, application and finish for your project.
Profile & surface planning
Milled for repeatable lines &
project-ready details.
A wide hardwood trim board for fascia, frames and refined exterior transitions. High-temperature thermal modification reduces the board’s moisture response compared with the same species untreated.
Finish & Maintenance Recommendations:
Choose a compatible exterior finish when color retention is desired, and confirm factory-prefinish options with the dealer. If left unfinished, the surface will gradually weather toward silver gray; timing and uniformity vary with exposure and detailing.
Lower moisture uptake helps reduce seasonal movement across board joints.
No added synthetic wood preservatives in the thermal process.
Reduced movement supports more predictable joints when the profile is installed correctly.
Available by consultation through Builders FirstSource Issaquah.
The installation detail
Thermo Ash.
Details that matter.
Beautiful surfaces start with the right board, the right joint and the right support. Here is how this profile fits into the plan.
Your profile
1x10
S4S E4E
Four surfaced sides. Four eased edges.
Joint layout and fixing belong to the approved assembly.
Square edges. Deliberate detailing.
The catalog lists S4S E4E: surfaced four sides, eased four edges. This designation alone does not establish a tongue-and-groove joint.
Fasteners matched to the assembly.
Select stainless steel fasteners for the profile, substrate and exposure. Do not transfer the concealed-nailing detail for grooved Ayous siding to a square-edge board, decking or trim.
Support comes first.
Confirm backing, span, end support and fastening for this profile’s cataloged application. A trim board is not automatically a structural member.
Side-by-Side Comparisons
Compare Thermo Ash 1x10 S4S E4E
against traditional Pacific Northwest woods.
Fine, generally straight grain with a pale, quiet appearance.
Straight vertical grain selected for a consistent, premium visual rhythm.
Warm color variation, recognizable grain and a strong regional design tradition.
Strong contrast between earlywood and latewood with a distinctly regional character.
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.
YOUR SELECTIONThermo Ash 1x10 S4S E4E
Model FAQs
Thermo Ash 1x10 S4S E4E
project questions
What net size does the Maximo catalog list for Thermo Ash 1x10 S4S E4E?+
The 2026 catalog lists 13/16" x 9-7/8" (21 mm x 251 mm nominal metric equivalent). Confirm current production tolerances and available lengths when ordering.
What is the recommended fastener for Thermo Ash 1x10 S4S E4E?+
Select stainless steel fasteners for the profile, substrate and exposure. Do not transfer the concealed-nailing detail for grooved Ayous siding to a square-edge board, decking or trim. Confirm preparation, fastener size and penetration with Maximo.
How much waste should I calculate when ordering Thermo Ash 1x10 S4S E4E?+
Waste depends on available lengths, wall or deck geometry, joint layout, appearance matching and field cuts. Ask the Issaquah team to review the takeoff before ordering.
Product documents & submittals