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Seattle Two-Building Smooth James HardiePanel Exterior With 69 Windows, 3 Sliding Doors & TK Cedar Entry Soffits
This project covered two separate buildings with the same Smooth primed James HardiePanel exterior system and an unusually large number of openings.
The larger building included 51 windows and two sliding doors; the smaller building included 18 windows and one sliding door, for a total of 69 windows and three sliding doors.
At that scale, consistency becomes the project story: HydroGap, window tape, panel layout, trim, metal channels, Z flashing, soffits, and sealant all had to repeat correctly from one building to the next.
Two Buildings, One Exterior Standard
Both structures followed the same core assembly: HydroGap drainable paper, HydroGap window tape, Smooth HardiePanels, Smooth 5/4×4 window and door trim, prime H channels at outside corners, W metal at inside corners, Z flashing at window trim, QUAD MAX, and punched face nails.
69 Windows and Three Sliding Doors
Every opening interrupts the wall assembly. With 69 windows and three sliding doors, repeatable window integration was not a minor detail; it was one of the central quality controls for the entire project.
Smooth HardiePanels and Metal Channels
Smooth panels create broad flat surfaces where seam and corner alignment are highly visible. Prime metal H channels at outside corners and W profiles at inside corners gave the panel system a repeatable set of transitions across both buildings.
TK Cedar Entryway Soffits
Both buildings used 1×6 TK cedar at the entryway soffits, bringing a warmer natural-wood detail into an otherwise fiber-cement exterior. The broader soffit scope used smooth Hardie soffit with 3/8-inch aluminum H channel between seams.
HydroGap and Window Detailing
HydroGap drainable paper and HydroGap tape around the windows created the documented drainage layer. In PNW conditions, a large opening count magnifies the importance of keeping that drainage logic consistent across every elevation.
Why This Scope Matters in Pacific Northwest Conditions
Pacific Northwest siding work has to account for repeated rain, wind-driven moisture, shaded wall sections, and long wet seasons. The strongest project scopes do not ask the finished siding to do every job by itself. They coordinate the documented substrate, weather barrier, flashing, trim, blocks, soffit, panel seams, sealant, and finish details so water has a controlled path outward and the exterior can age as one system.
Outcome and Homeowner / Property Owner Value
The finished project is valuable because the visible James Hardie material is tied to the supporting work documented in the source scope. That makes the page a proof asset for KV Construction’s full-system approach rather than a generic materials list. Where a source detail is missing or ambiguous, this package keeps it open instead of inventing a product, color, repair condition, or location.
Project Specifications And Materials
- Area: Seattle, WA
- Type: Two-building Smooth James HardiePanel exterior package
- Total Windows: 69
- Total Sliding Doors: 3
- Larger Building: 51 windows and 2 sliding doors
- Smaller Building: 18 windows and 1 sliding door
- Weather Barrier: HydroGap drainable paper
- Window Detailing: HydroGap tape around windows
- Siding: Smooth primed James HardiePanels
- Trim: Smooth Hardie 5/4x4 window and door trim
- Outside Corners: Prime metal H channel
- Inside Corners: Prime W metal
- Window Flashing: Prime Z flashing on window trims
- Entry Soffit: 1x6 TK cedar
- Main Soffit: Smooth “prevented” Hardie soffit with 3/8-inch aluminum H channel
- Sealant: QUAD MAX caulking
- Finish Detail: Punch face nails
- Photo Source: CompanyCam gallery: https://app.companycam.com/galleries/Ha62MCkj
Request a Free Siding Consultation
Talk with KV Construction about a full siding replacement, James Hardie exterior upgrade, or larger exterior-envelope project built for Pacific Northwest weather. KV Construction is owner-operated, uses consistent crews, follows disciplined flashing and QUAD MAX sealant standards where specified, and backs its work with a 5-Year KV Workmanship Warranty. Request a free siding consultation to review your exterior, materials, waterproofing details, and project fit.
