Lynden Door P4 Particleboard Interior Doors

The P4 delivers a 1-3/4 inch thick solid particle core that outperforms hollow alternatives for sound dampening and durability. Contractors building multi-family housing, offices, or assisted living facilities get the weight and feel of a quality door.

The particleboard core construction provides that solid thunk when closing — not the cheap rattle of hollow cores. That matters in apartments where noise complaints drive callbacks. It matters in offices where conference room privacy isn’t optional. The P4’s solid particle core handles higher-traffic residential and light commercial areas where hollow doors would show wear within months.

Core Construction and Performance

Lynden builds the P4 with conventional milled softwood stiles and rails surrounding a drop-in particleboard core. This isn’t compressed sawdust held together with hope. The solid particle core provides genuine sound dampening that hollow cores can’t touch.

Face options cover the spectrum of commercial needs. Wood veneers in various species deliver the upscale look apartments need to command higher rents. Pre-finished hardboard panels (smooth or embossed) speed installation on multi-unit projects. Paint-grade MDO and primed MDF surfaces take field finishing when architects specify custom colors.

Edge treatments include wood veneer (VEB), high-pressure decorative laminate (HPDL), or full-face 3/4-inch hardwood stile edges. The hardwood edge option matters on high-traffic doors where impact resistance at the latch side prevents damage.

Specification	Value
Core Type	Particleboard (P-type) / Solid Particle Core
Thickness	1-3/4 inches
Stiles/Rails	Conventional milled softwood
Fire Rating	Non-rated standard; P20 variant available for 20-minute rating

Environmental Compliance for Regulated Projects

The P4 meets CARB Phase II, TSCA Title VI, and SOR/2021-148 formaldehyde emission requirements. That’s not marketing fluff. It’s mandatory compliance for multi-family housing, schools, and healthcare facilities.

Lynden offers FSC certification as an option for LEED projects. The doors carry SCS Indoor Advantage Gold certification — another box checked for green building programs.

Field finishing is generally not recommended and may impact warranty status. Smart contractors order factory finishes. Custom factory stain and paint options eliminate jobsite delays and quality control issues.

Real-World Applications

Single-family builders use P4s for bedrooms and bathrooms where sound privacy matters. Multi-family developers spec them throughout apartments and condos. Light commercial contractors install them in offices, tenant improvements, assisted living facilities, and student housing.

The P4 fits standard interior door hardware — hinges, knobs, levers, latches all mount without special prep. Doors come as finished slabs or pre-hung frame-ready units. Pre-hung saves labor on large projects where time equals money.

Compared to Lynden’s hollow core options (H8 at 1-3/8 inch or H4 at 1-3/4 inch), the P4 weighs more. The payoff comes in reduced callbacks, better sound control, and doors that still close properly after years of use.

The warranty runs one year on defects in material or workmanship for interior applications. Standard exclusions apply — improper storage, installation errors, and moisture exposure void coverage.

The P4 won’t revolutionize door technology. It simply delivers what contractors need: a solid-feeling door that meets codes, installs cleanly, and doesn’t generate complaints. For multi-family and light commercial projects where quality matters, the P4 hits the mark.

Frequently Asked Questions

What’s the actual weight difference between P4 particle core and hollow core doors? Particle core doors weigh significantly more than hollow alternatives. That extra weight translates to better sound dampening and a more substantial feel.

Can these doors be trimmed on site? Factory sizing options are available in a wide range of configurations. Contractors should order correct sizes rather than field-modify to maintain warranty coverage.

Do P4 doors come with bore prep for hardware? The doors are compatible with standard interior door hardware and work with standard hardware preparation guidelines.

What’s the STC rating on these doors? Lynden designs doors to meet various standards including sound transmission (STC ratings). Contact your supplier for specific P4 performance data.

Are P4 doors suitable for bathroom installations? The P4 is listed for bathroom applications in single-family homes. Standard warranty exclusions include exposure to moisture, so proper bathroom ventilation remains critical.