Is marine plywood necessary for the whole house?

No. Marine or BWP grade belongs in the kitchen, bathrooms, utility, and any joinery against a wet wall. BWR is the right, more sensible choice for the dry rooms that make up most of a flat.

Does MDF survive a Hyderabad monsoon?

Standard MDF is moisture-hungry and best kept to dry, ventilated zones. Where an MDF-like finish is wanted near water, a moisture-resistant board is the safer base.

Why do my wardrobe doors stick only in the monsoon?

The shutter has taken on moisture and expanded against its frame. A small breathing gap at installation, ventilation inside the wardrobe, and a water-resistant board reduce it.

Are solid wood doors a risk in the rains?

Only if the timber is unseasoned. Properly seasoned hardwood is one of the most stable choices you can make for the climate.

How do I stop mould behind cabinets?

Leave a small gap between the unit and the wall, allow air to move, and avoid sealing a damp corner shut. Mould needs still, trapped moisture, so movement of air is the cure.

Materials That Survive Hyderabad's Monsoon

How interior materials hold up through Hyderabad's monsoon: plywood grades MR, BWR and BWP, veneer vs laminate, solid wood, and the floors and detailing that resist swelling and mould.