Doors & Flush Doors · Core Types
Types of Flush Doors
"Flush door" isn't one product — it's a category that spans hollow, solid and cellular core construction, each suited to a different level of performance and budget.
| Core Type | Weight | Best Use |
|---|---|---|
| Hollow core | Lightest | Low-traffic interior rooms, budget-conscious projects |
| Cellular core | Light, honeycomb structure | Mid-range interior doors balancing weight and rigidity |
| Solid core | Heaviest | High-traffic doors, wet areas, entrances — best durability |
Finishes and Specialised Variants
Surface Finish Options
Laminate, veneer, painted surfaces and specialised coatings can all be applied over any of the three core types.
Fire-Rated Variant
Specialised core and edge sealing tested to hold back fire for a rated duration — required in many commercial and high-rise settings.
Composite Waterproof Variant
BWP-grade core and adhesive built specifically for bathrooms, kitchens and other sustained-moisture applications.
Choosing Between Them
Match core type to traffic and moisture exposure first, then choose the finish and any specialised rating the application needs.
Related Guides
See our flush door manufacturing process guide for how each core type is actually built, our blockboard vs flush door guide for a custom-built alternative to a solid-core door, and our types of doors overview for how flush doors compare to other door categories.
Frequently Asked Questions
What are the three main flush door core types?
Hollow core, cellular core and solid core — ranging from lightest and most budget-friendly (hollow) to heaviest and most durable (solid).
Which flush door core type is best for a bathroom?
Solid core, built in BWP (boiling waterproof) grade, is best for bathrooms and other sustained-moisture applications given its durability and moisture resistance.
Are fire-rated flush doors a different core type?
They use specialised core construction and edge sealing designed and tested to hold back fire for a rated duration, distinct from the standard hollow, cellular or solid core categories.
Can any flush door core type be finished with veneer or laminate?
Yes — laminate, veneer, paint and specialised coatings can all be applied over hollow, cellular or solid core construction; the finish choice is independent of the core type.
Is a cellular core door a good middle-ground choice?
Yes — it offers more rigidity than a basic hollow core while staying lighter than a full solid core, making it a reasonable choice for general interior doors that see moderate use.
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