Which type of MDF should be used for a bathroom vanity?

Interior Grade, Type II (also known as High Moisture Resistance or HMR grade) is recommended for areas of occasional wetting and high humidity like bathrooms. (Clause 4 and Table 1)

How should MDF sheets be stored on a construction site?

Store them horizontally on a flat, level surface, raised from the ground on bearers (pallets or battens) spaced at a maximum of 800 mm. Cover the stack to protect from rain and direct sun. (Clause 5.2)

Do I need to drill a pilot hole for screws in MDF?

Yes, it is highly recommended to prevent splitting and improve screw holding. The pilot hole diameter should be about 85-90% of the screw's root diameter. (Clause 7.2.1)

Why do the edges of MDF look fuzzy after painting?

The edges are more porous than the face and absorb more paint, causing the wood fibres to swell. To prevent this, thoroughly sand the edges and apply one or two coats of a high-quality sealer or primer before the top coat. (Clause 8.1)

IS 15512

: 2004

Selection and Use of Various Types of Medium-Density Fibre Boards - Code of Practice

CurrentFrequently UsedCode of PracticeBIMMaterials Science · Wood and Other Lignocellulosic Products

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This standard provides a code of practice for the selection of Medium-Density Fibreboard (MDF) based on its intended end-use, such as for furniture, partitions, or panelling. It gives comprehensive guidelines on the handling, storage, processing (machining), jointing, and finishing of MDF to ensure durability and a high-quality outcome.

Selection and Use of Various Types of Medium-Density Fibre Boards - Code of Practice

Quick Reference Values

Recommended storage bearer spacingnot more than 800 mm

Recommended minimum edge distance for screws25 mm from a corner at right angle to screw axis

Recommended minimum edge distance for nailing15 mm

Maximum stack height for manual handling1 m

Recommended moisture content for adhesive application7 to 9 percent

Recommended pilot hole diameter for screws85-90% of the screw root diameter

Practical Notes

MDF is very susceptible to moisture. Always seal all faces and especially the highly porous edges with a suitable primer or sealer before painting or use in potentially damp locations.

The fine dust generated from cutting or sanding MDF is a health hazard. Always use appropriate dust extraction systems and wear respiratory protection (P2/P3 mask).

MDF has poor screw-holding capacity on its edges. For strong joints, prefer face-screwing, use specialized MDF fasteners, or reinforce edge joints with dowels or biscuits.