Lynden Door P8 (Particle 1-3/8″) Standard Construction

The P8 particleboard core door provides better sound reduction and ‘feel’ than hollow core alternatives without jumping to architectural-grade pricing. Contractors regard it as a reliable, mid-range solid core door for residential projects where sound attenuation matters — bedrooms, home offices, bathrooms adjacent to living spaces.

At 1-3/8” thickness with a solid particleboard core, the P8 gives interior doors that satisfying weight when they close. No more hollow-sounding slams that echo through the house. The core material provides enhanced sound reduction compared to hollow alternatives, making it worth the upgrade for noise-sensitive applications.

Construction Specifications

The P8 features standard 1-1/8” (29mm) softwood stiles and rails surrounding a solid particleboard core. This isn’t some lightweight composite — it’s genuine particleboard that adds heft and stability.

Specification	Value
Model Designation	P8
Thickness	1-3/8” (35mm)
Core Material	Particleboard (Solid Core)
Stiles & Rails	1-1/8” (29mm) softwood
Adhesive	Type II (interior application)

The door accepts multiple finish options including wood veneer, molded profiles, pre-finished smooth or embossed surfaces. That flexibility means matching existing doors in remodels or achieving specific design goals in new construction.

Lynden Door backs the P8 with CARB Phase II compliance for formaldehyde emissions, TSCA Title VI compliance, and Canadian SOR/2021-148 formaldehyde compliance. The doors meet WDMA (Wood Door Manufacturers Association) performance standards for residential interior doors.

Installation Requirements

The P8 weighs more than hollow core counterparts, which changes installation dynamics. The additional weight requires standard but firm hinge mounting — no shortcuts on screw selection.

Critical installation requirements include maintaining 25% to 55% relative humidity during storage, using 3-inch screws for top and bottom hinges, and ensuring the rough opening is plumb, level, and square. Montana’s variable climate makes that humidity range particularly important. Store these doors in heated spaces during winter, not in unheated garages where freeze-thaw cycles wreak havoc.

Lynden Door emphasizes storing doors flat on a level surface in a dry, well-ventilated building and not installing until the building is acclimatized. That means waiting until the HVAC system runs and interior humidity stabilizes — rushing installation leads to warped doors.

Hardware and Finish Compatibility

The P8 works with standard 2-3/8” or 2-3/4” backset locksets and can be pre-drilled at the factory. Factory drilling beats field drilling every time — precise bore placement without the risk of splintering faces.

Compatible frame options include standard wood, steel, or aluminum interior door frames. Unfinished or primed doors accept water-based and solvent-based paints or stains, though factory finishing delivers more consistent results.

Optional accessories include custom factory staining or painting, pre-drilling for hardware, specialty glass/vision-lite options, soft-close hinges, and louvers. The soft-close hinges complement the door’s heavier weight, preventing slams that test frame integrity.

Common Questions

How much heavier is the P8 compared to hollow core doors? The particleboard solid core makes it heavier than hollow core H8 counterparts, typically adding 15-20 pounds per door. That extra weight provides better stability and sound attenuation.

Can P8 doors be trimmed to fit? Yes, but with limits. The 1-1/8” softwood stiles and rails provide some trimming allowance, typically up to 1/2” per side. Excessive trimming compromises structural integrity.

What’s the difference between P8 and P4 doors? P8 doors measure 1-3/8” thick while P4 doors are 1-3/4” thick and designed for heavier-duty applications or where a deeper profile is needed.

Are P8 doors fire-rated? The P8 does not carry a fire rating.

What maintenance does the P8 require? Minimal. The door accepts standard paints and stains if refinishing becomes necessary. Keep humidity controlled and hinges adjusted — the basics matter more than special maintenance.

Frequently Asked Questions

Q: How does the Lynden Door P8 compare to hollow core doors for sound reduction?

The Lynden Door P8’s solid particleboard core provides significantly better sound attenuation than hollow core alternatives, making it ideal for bedrooms, home offices, and bathrooms where noise control matters. The particleboard core adds substantial weight compared to hollow alternatives, eliminating that hollow-sounding slam when doors close.

Q: What size lumber makes up the frame of the P8 door?

The Lynden Door P8 features 1-1/8” (29mm) softwood stiles and rails as standard for the SD series construction. These components surround the solid particleboard core and are bonded with Type II adhesive for interior applications.

Q: Can I get the Lynden Door P8 pre-drilled for my lockset?

Yes, Lynden Door can pre-drill the P8 at the factory for standard 2-3/8” or 2-3/4” backset locksets. The P8 also accepts custom factory staining or painting, specialty glass options, soft-close hinges, and louvers as optional accessories.

Q: Is the Lynden Door P8 fire-rated?

The P8 does not carry a fire rating.

Q: What certifications does the Lynden Door P8 carry for indoor air quality?

The Lynden Door P8 meets CARB Phase II compliance for formaldehyde emissions, TSCA Title VI compliance, and Canadian SOR/2021-148 formaldehyde compliance. The door also meets WDMA (Wood Door Manufacturers Association) performance standards for residential interior doors.

Q: What warranty comes with the Lynden Door P8?

Lynden Door provides a one-year limited warranty on the P8 Standard Construction series, covering manufacturing defects in materials and workmanship under normal use. This applies to their standard construction residential interior doors including the P8 particleboard core model.