Fitted kitchen carcasses — MR-MDF vs plywood vs chipboard, which survives Dubai humidity?
Speccing a fitted kitchen, and the quotes mention different carcass (box) materials — moisture-resistant MDF, plywood, chipboard/melamine. I care most about surviving Dubai humidity and the odd under-sink leak.
- What's the real difference between these carcass materials?
- Which holds up best here (humidity + water risk)?
- Is it worth paying more for plywood?
Trying to spec the boxes right, not just the doors — I gather a swollen carcass is a common disaster. What should I insist on?
3 answers
Short answer: for a Dubai kitchen the carcass material matters as much as the doors, because humidity and the inevitable under-sink leak are what destroy cabinets. Ranked for water/humidity resistance: MARINE/exterior PLYWOOD is best (it laughs off damp and holds screws for decades), MOISTURE-RESISTANT (MR) MDF is a solid middle ground and the common sensible spec, and standard CHIPBOARD/melamine is the cheap one that swells and crumbles the moment water gets in. Plywood is usually worth the extra under the sink and in wet zones at minimum.
The materials: - Plywood (marine/exterior grade): layered timber — strongest, best with moisture, holds fixings/hinges superbly, lasts. Costs more and a good ply carcass is heavier/pricier, but it's the one that survives leaks and humidity. Best choice, especially for the sink run and tall units. - Moisture-Resistant (MR) MDF: dense, smooth, treated to resist moisture far better than standard MDF. A sensible, common mid spec — good value, fine for most of the kitchen if it's genuinely MR (green-tinted) and edges are sealed. Not as bulletproof as ply if actually soaked, but much better than chipboard. - Standard chipboard / melamine-faced chipboard: cheapest, fine while dry, but swells and disintegrates once water penetrates an unsealed edge — exactly the under-sink swelling disaster. Avoid for wet zones.
What to insist on for here: - At minimum, plywood (or genuine MR-MDF) for the sink base and any wet-zone units; don't let them put chipboard under the sink. - All cut edges sealed/edge-banded — water gets in at raw edges first. - Confirm which material is actually quoted (not just "MDF"), and MR (moisture-resistant) grade if MDF. - A water-tolerant plinth and a tray/liner under the sink helps.
So: ply where it'll get wet, MR-MDF for the rest is a fair balance, chipboard only if you're chasing the lowest price and accept the risk. Spec the boxes, not just the finish — get a joiner who'll quote the carcass material honestly. Anyone had a chipboard carcass swell out under the sink?
This is exactly what I needed — the quotes just said "MDF" and now I know to ask "standard or moisture-resistant, and what's under the sink?" We're going ply for the sink run and tall units and MR-MDF for the rest, which the joiner agreed was the sensible balance. The edge-sealing point is one I'd never have checked; apparently that's where the water sneaks in first. Spending a bit more on the boxes that'll get wet feels obviously worth it versus replacing a swollen cabinet in two years.
Can confirm the chipboard-under-the-sink horror is real — a previous flat's cabinet swelled into a crumbling mess after a slow leak nobody caught. If I ever spec a kitchen again it's ply or proper MR-MDF for anything near water, no question. The doors get all the attention in showrooms but it's the humble box that fails first here. Ask what the carcass is and make them seal the edges — cheap insurance against a very annoying, messy failure.
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