Material storage​, Material testing, Dry rot, and Wet rot

General Principles

• Protect materials from weather (rain, sun, moisture).

• Store off the ground on pallets or platforms.

• Organize materials for easy access and safety.

Storage of Cement

• Store in dry, ventilated area

• Stacked on wooden pallets, max 10 bags high

• First in, first out.

Storage of Timber

• Stack flat, off ground, covered

• Allow air circulation to prevent warping

Storage of Steel

Store above ground, coated or covered to prevent rust 

Storage of Aggregates

• Stored in heaps on hard surface

• Keep coarse and fine separate to avoid contamination

Storage of Blocks & Bricks

• Stack on level ground

• Don’t stack too high (safety)

Purpose of Material Testing

• Ensure materials meet standards

• Guarantee strength, durability, and safety

• Detect defects early

Common Cement Tests

• Fineness test

• Setting time

• Compressive strength

Common Concrete Tests

• Slump test (workability)

• Cube test (strength)

Common Aggregates Tests

• Sieve analysis (grading)

• Impact test

Common Steel Tests

• Tensile strength

• Bend test

Common Timber Tests

• Moisture content test

• Hardness test

Variables Needed for Fungal Growth

• Moisture (If moisture content in timber > 20%, fungal growth is likely)

• Oxygen

• Suitable temperature (40–100°F / 5–38°C)

• Food source (timber starch & cellulose)

Dry Rot

• A serious fungal decay in timber caused by Serpula lacrymans

• Appears in poorly ventilated, damp areas (under floors, behind walls)

• Timber becomes dry and brittle, and cracks into cubes (cuboidal cracking)

• Cotton-wool-like fungal growth with red/orange dust (spores)

• Can spread across masonry to reach new timber

Effect of Dry Rot on Building

• Weakens structural timbers

• Can spread quickly if untreated

• Leads to high repair cost

Dry Rot Treatment and Protection

• Identify and eliminate sources of moisture

• Improve ventilation in affected areas

• Remove all infected timber and burn/dispose safely

• Apply fungicidal treatment to adjacent masonry and new timbers

Wet Rot

• Wet rot is fungal decay in timber caused by a range of fungi, most common being Coniophora puteana

• Appears where timber is persistently damp (leaking pipes, roof leaks, contact with wet ground)

• Timber becomes soft, spongy, darkened in color

• Cracks along the grain, not cuboidal

• Fungus confined to damp area—does not spread across masonry

Effect of Wet Rot on Building

• Localized weakening of timbers

• Often found in window frames, floorboards, roofing timbers

• Leads to high repair cost

Wet Rot Treatment and Prevention

• Stop the source of moisture

• Remove and replace decayed timber

• Protect replacement timber with preservatives

• Maintain regular inspections in moisture-prone areas