HMR is moisture-resistant particleboard, usually with a green core. It is required in sink runs, laundries and bathrooms, and it must be sealed at the cut edges. Standard board swells once water reaches the core; HMR slows that process, but it is not waterproof. The cut edge is where the board fails first.
HMR is moisture-resistant, not waterproof.
Use it in sink runs, laundries and bathrooms.
Seal every cut edge.
Verify with the board invoice, not just the colour.
Compact laminate or solid surface for fully wet areas.
1. What HMR is
HMR stands for high moisture resistance. It is particleboard made with a moisture-resistant resin, often dyed green so it can be identified. It absorbs water more slowly than standard board, which buys time when a leak or a spill happens. It does not make the board waterproof.
2. Where it is required
| Área | Junta Directiva | Nota: |
|---|---|---|
| Sink run | HMR | Seal cut-outs for sink and tap |
| Dishwasher housing | HMR | Steam and leaks |
| Lavandería | HMR | Machine and tub |
| Tocador de baño | HMR | Basin and waste |
| Gabinetes secos | Estándar | HMR not required |
The areas that matter are the ones with a water connection or a steam source. A dry pantry does not need HMR; a sink run does.
3. The cut edge
Board is protected on the face but exposed at the cut. A sink cut-out, a tap hole or a raw edge at the wall is where water enters. Seal every cut edge with edge banding, sealant or a waterproof membrane. The face is rarely the failure; the edge is.
4. Verificación
Ask for the board invoice or certificate and check the core colour. A green core is a common marker, but the invoice is the stronger evidence. A factory that cannot produce either is asking you to trust a colour.
5 Alternativas
Compact laminate and solid surface do not have a swelling core, so they suit fully wet areas better than HMR. They cost more and need different fixings. For a family bathroom, HMR with sealed edges is usually enough; for a commercial shower block, it is not.
6. Sealing and membranes
Seal cut edges and use a waterproof membrane behind tiles and around wet zones. The cabinet is the last line of defence, not the first. A membrane that fails will defeat the best board.
7. Specifying HMR
Name the board, the areas and the sealing requirement. A specification that says moisture-resistant without naming the areas leaves the choice to the factory. The guía de materiales de la canal covers the board options.
8. Errores comunes
Three mistakes recur: using standard board under a sink, sealing the face but not the cut edge, and assuming HMR is waterproof. Each is cheap to avoid at specification stage and expensive to fix after a leak.
9. Una lista de verificación antes de comprometerse.
Antes de firmar, confirme seis puntos: la calidad de la placa, el modelo de hardware, el sistema de acabado, el estándar de embalaje, el alcance de la inspección y el calendario de pagos. Todos deben constar por escrito, no por teléfono. La lista de verificación del presupuesto resume estos seis puntos en una comparación de una página.
10. Errores comunes
El error más común es comparar el precio de fábrica con el costo de entrega. El segundo es no incluir la inspección en el presupuesto. El tercero es pagar el saldo antes de que se apruebe la inspección. Todos estos errores se pueden evitar con un alcance del proyecto por escrito y una inspección previa al envío.
11. Cómo medir la habitación
Mida cada pared en tres puntos: superior, medio e inferior, y utilice la medida más pequeña. Las paredes rara vez son perfectamente cuadradas, y una curvatura de 10 mm en tres metros modifica el relleno. Mida el techo en cada esquina y anote la ubicación de enchufes, radiadores y tuberías de desagüe antes de dibujar. Un levantamiento a escala ahorra más tiempo que un dibujo rápido, y la guía de medición incluye una hoja imprimible.
13. Una lista de verificación de especificaciones
Escriba cuatro líneas para cada material: el producto, el grado, el espesor y el tratamiento de la superficie o los bordes. Si un material se especifica solo por su nombre, el grado lo determina la fábrica, y es en el grado donde se definen el costo y el rendimiento.
14. Questions the factory will ask
Espere cuatro preguntas: qué grado, qué grosor, qué tipo de borde y qué lote. Las respuestas deberían estar ya incluidas en las especificaciones. Si no lo están, la fábrica elegirá la opción más económica que cumpla con el plano.
Preguntas frecuentes
What is HMR board?
HMR is moisture-resistant particleboard, usually with a green core. It uses a moisture-resistant resin that slows water absorption, but it is not waterproof.
Where is HMR required?
Sink runs, dishwashers, laundries and bathrooms. Any cabinet that can get wet should use HMR, with sealed cut edges.
Is HMR waterproof?
No. It resists moisture far better than standard board, but prolonged water still causes swelling. Seal the edges and fix leaks.
How do I verify HMR?
Ask for the board invoice or certificate, and check the core colour. A green core is a common marker, though the invoice is the stronger evidence.
Can I use HMR everywhere?
You can, but it costs more and is not necessary in dry areas. Use it where water is likely, and standard board elsewhere.
What is better than HMR?
Compact laminate or solid surface for a fully wet area. They cost more but do not swell at the core.
