What is the maximum permissible moisture content for wood blocks before laying?

The moisture content shall not exceed 12 percent (Clause 3.1.2).

How long must a new concrete sub-floor cure before laying wood blocks?

A minimum of 28 days, and it must be surface-dry (Clause 4.1.1.1).

What are the two main methods for laying the blocks?

The code specifies laying with hot-laid adhesive (bitumen mastic) or cold-laid adhesive (Clause 5).

How soon can the floor be sanded after laying?

After 7 to 14 days for cold adhesives, and after 24 hours for hot-laid bitumen adhesives (Clause 6.1).

IS 5389

: 1969

Code of practice for laying hardwood parquet and wood block floors

CurrentSpecializedCode of PracticeBIMArchitectural · Building Construction Practices incl. Painting, Varnishing

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This standard outlines the code of practice for laying hardwood parquet and wood block floors. It covers material selection, sub-floor preparation for both concrete and timber bases, laying procedures using hot-laid and cold-laid adhesives, and final finishing operations like sanding and polishing.

Code of practice for laying hardwood parquet and wood block floors

Quick Reference Values

Maximum moisture content for wood blocks12 %

Minimum curing period for concrete sub-floor28 days

Typical thickness of levelling screed20 mm to 50 mm

Waiting period before sanding (cold adhesive)7 to 14 days

Waiting period before sanding (hot bitumen)24 hours

Practical Notes

Ensure wood blocks are acclimatized to the room's humidity and temperature for at least 72 hours before installation to prevent post-installation movement.

Sub-floor moisture content is the most critical factor for success. A damp sub-floor will lead to adhesive failure, cupping, or buckling of the wood.

When using hot bitumen, ensure adequate ventilation and strict temperature control to achieve proper adhesion and for safety.