Lynden Door H4 Standard Construction Hollow Core (1-3/4″)

The Lynden Door H4 hollow core delivers exactly what Montana contractors need for interior door projects — lightweight construction that doesn’t sacrifice dimensional stability. At approximately 1.54 kg/ft² (3.4 lb/ft²), or ~68-75 lbs for a standard 3/0 x 6/8 door leaf, this door solves the handling problem that makes solid core installations a backache on remote job sites. The real kicker? Six face options including Wood Veneer (HPVA A-grade), Molded Profile, Pre-finished Hardboard, Primed Hardboard, HDF, and MDO mean contractors can match any interior aesthetic without switching door cores.

Weight and Installation Reality

The math on job site efficiency is simple. A standard 3/0 x 6/8 door weighs approximately 68-75 lbs — that’s half the weight of a comparable particleboard core door. For a 50-unit apartment complex, that weight difference translates to thousands of pounds less material to haul up stairs and wrestle into frames. The Supercell expanded-kraft corrugated paper honeycomb/cellular core provides the structure without the bulk.

Standard widths run from 10” to 40”, covering everything from narrow utility closets to wide passage doors. Heights go up to 80” standard, with custom heights available up to 10’ for those commercial projects with higher ceilings. The flexibility matters when you’re dealing with Montana’s mix of standard residential framing and the occasional custom home with cathedral ceilings.

Specification	Value
Weight	1.54 kg/ft² (3.4 lb/ft²)
Standard Door Weight	~68-75 lbs (3/0 x 6/8)
Core Type	Supercell expanded-kraft corrugated paper
Thickness	1-3/4 inch (44.45 mm)
Width Range	10” to 40”
Height Range	Up to 80” standard; custom to 10’
Undercut	Typical 1/2” undercut for air flow

Environmental Compliance Without the Headache

Montana’s commercial projects increasingly demand environmental certifications, especially for schools and government buildings. The H4 checks every box without requiring special orders. CARB Phase II and TSCA Title VI compliant means no formaldehyde emission worries. Indoor Advantage Gold certified for low VOC emissions keeps indoor air quality complaints at bay.

For contractors bidding on projects with sustainability requirements, FSC Mix certified options available (FSC-C103189) provide the documentation needed without switching to premium product lines. The Environmental Product Declaration (SCS-EPD-07669) gives you transparency on the environmental impact from cradle to grave.

Face Options and Customization

The six face options transform a basic hollow core into whatever the project demands. Wood Veneer (HPVA A-grade) gives you real wood appearance for executive offices. Primed Hardboard arrives ready for field painting to match any color scheme. Pre-finished Hardboard skips the painting step entirely — crucial when you’re racing Montana’s short construction season.

Factory staining (Pacific Collection) and painting (custom) options eliminate another field task. HDF faces handle high-traffic areas where durability trumps aesthetics. MDO provides the smooth, paintable surface that institutional clients prefer.

Installation Considerations for Montana

Montana’s humidity swings demand attention during installation. Doors should be allowed to acclimate to local humidity for at least 24 hours before installation — skip this step and you’ll be back adjusting sticking doors come spring. Store flat in a dry, ventilated area; do not store on edge or in direct contact with concrete. That means keeping them off the slab and covered on job sites.

Pre-machining for hinges and locks is available, saving field time and ensuring consistent bore locations. If unfinished, sand lightly and seal all six sides (faces, edges, top/bottom) immediately after installation — Montana’s seasonal humidity changes will warp unsealed doors faster than you can say warranty callback.

Compatible with standard interior door frames and hardware; specific machining available for standard backsets and hinge preps. No special hardware required, no proprietary systems to stock.

The Bottom Line

The H4 hollow core hits the sweet spot for Montana’s multi-family and light commercial projects. Light enough to prevent installer fatigue, sturdy enough to handle daily use, and available with enough face options to satisfy any architect. The 1-Year Interior Limited Warranty (Standard Construction series) covers manufacturing defects without pretending these are lifetime doors.

General company rating of ~4 stars (based on Birdeye 113 reviews); customers highlight quality and range of options. That’s the feedback that matters — consistent quality and options that work.

For contractors tired of hauling heavy particleboard doors up three flights of stairs, the H4’s 70-pound weight feels like switching from steel-toed boots to running shoes. Add the environmental certifications that keep inspectors happy and face options that satisfy designers, and you’ve got an interior door that works for the realities of Montana construction.

Frequently Asked Questions

Q: How much lighter is the H4 compared to solid core doors? A: At approximately 68-75 lbs for a standard 3/0 x 6/8 door, the H4 weighs roughly half what a comparable particleboard core door weighs. That’s significant when you’re installing dozens of doors in a project.

Q: What’s the actual core material in these hollow doors? A: The core uses Supercell expanded-kraft corrugated paper in a honeycomb/cellular configuration. Think industrial-grade cardboard honeycomb that provides surprising rigidity without the weight.

Q: Can these doors be trimmed to fit? A: The doors feature hardwood edge stiles (Standard Construction series) or mill-option structural composite lumber/solid wood (Architectural series), which allow for minor field trimming. Always follow manufacturer guidelines for maximum trim allowances.

Q: Do I need special storage conditions on the job site? A: Yes. Store flat in a dry, ventilated area; do not store on edge or in direct contact with concrete. Doors should be allowed to acclimate to local humidity for at least 24 hours before installation.

Q: What certifications do these doors carry for green building projects? A: The H4 comes with CARB Phase II and TSCA Title VI compliance, Indoor Advantage Gold certification for low VOC emissions, FSC Mix certified options (FSC-C103189), and an Environmental Product Declaration (SCS-EPD-07669).

Q: Are these doors typically sold prehung or as slabs? A: Typically sold as a door slab; hardware, jambs, and accessories are not included unless ordered as part of a pre-hung unit.