Imperial & Metric Net
1" x 5-1/2" (25 mm x 140 mm)
THERMOStart your projectGet a quoteBUILDERS FIRSTSOURCE · ISSAQUAHGet a local Maximo consultation
Thermo Ash · Maximo 2026 Collection
5/4x6S4S E4E End Match.
Thermo Ash 5/4x6 S4S E4E End Match 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.
1" xNet Finished Size
ConfirmCoverage from project layout
ProjectSpecific waste allowance
20 YearMaximo warranty
Milling Details
S4S E4E profile with end-matched board ends
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
Siding & Cladding · Ceilings & Soffits · Decking
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 substantial end-matched board built for bold surfaces and high-use exterior spaces. 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
5/4x6
S4S E4E End Match
CATALOG CROSS-SECTION
Original catalog artwork. Enlarged for clarity, not to scale. Use the approved detail for installation.
End-matched where specified.
This Ash SKU is listed as End Match. That is a board-end feature, not permission to place joints off framing. Confirm end support for the application.
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.
A wall that can dry.
For siding, Maximo calls for furring secured to studs and ventilation behind the boards. Coordinate the drainage path, openings and clearances with the wall design.
Side-by-Side Comparisons
Compare Thermo Ash 5/4x6 S4S E4E End Match
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 5/4x6 S4S E4E End Match
Model FAQs
Thermo Ash 5/4x6 S4S E4E End Match
project questions
What net size does the Maximo catalog list for Thermo Ash 5/4x6 S4S E4E End Match?+
The 2026 catalog lists 1" x 5-1/2" (25 mm x 140 mm nominal metric equivalent). Confirm current production tolerances and available lengths when ordering.
What is the recommended fastener for Thermo Ash 5/4x6 S4S E4E End Match?+
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. For ceilings and soffits, request a separate overhead support and fastening schedule.
How much waste should I calculate when ordering Thermo Ash 5/4x6 S4S E4E End Match?+
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