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.