Doors & Flush Doors · Blockboard
Everything You Need to Know About Blockboard Doors
A blockboard door is essentially a solid strip core sandwiched between veneer faces, built to the exact size and finish a carpenter or homeowner specifies.
How a Blockboard Door Is Built
A blockboard door starts with seasoned softwood or hardwood strips glued edge to edge to form a solid core, faced with wood veneer on both sides using a phenol-formaldehyde adhesive, and often given an anti-termite and borer treatment before assembly. Built and cared for properly, this construction typically lasts 15–20 years.
Four Advantages of a Blockboard Door
Excellent Screw & Hinge Holding
The solid strip core takes hinge screws securely, which matters for a door that gets opened and closed thousands of times over its life.
Fully Custom Sizing
Unlike a factory flush door limited to standard sizes, a blockboard door can be built to any non-standard opening dimension.
Fit for Almost Any Application
Main doors, wardrobe doors, cabinet doors and partition doors can all be built from the same core material at the appropriate grade.
Available in Waterproof Grade
Boiling waterproof (BWP) blockboard extends the same construction to wet-area doors where moisture resistance matters most.
Maintenance and Related Choices
Sealing exposed edges and keeping the door away from standing water are the two biggest factors in reaching the top end of a blockboard door's lifespan. See our blockboard vs flush door guide for how this compares to a factory-made alternative, our types of blockboard guide for choosing a core type, and our blockboard uses guide for other applications beyond doors.
Frequently Asked Questions
How long does a blockboard door last?
With proper assembly and care, a blockboard door typically lasts 15 to 20 years, and can last longer with regular maintenance and edge sealing.
Is a blockboard door waterproof?
Standard blockboard doors are not fully waterproof, but boiling waterproof (BWP) grade blockboard is available for doors in bathrooms, kitchens and other wet-area applications.
Can a blockboard door be custom sized?
Yes — this is one of its main advantages over a factory flush door, since it can be built to fit any non-standard door opening.
What treatment do blockboard doors get against termites?
Quality blockboard doors are typically given an anti-termite and borer treatment during manufacturing, in addition to whatever moisture grade the core is built to.
Is a blockboard door heavier than a flush door?
Generally yes — a solid blockboard core is heavier than a hollow or cellular-core flush door, though comparable in weight to a solid-core flush door.
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