Rubble sacks

Small on purpose

The most common mistake on site is ordering a big heavy sack. A 125 µm sack at 800 × 1200 mm sounds like the strongest option available; filled with hardcore it weighs over 40 kg, nobody can lift it, and it tears under its own load before it is full.

A rubble sack is deliberately small. 500 × 750 mm at 100–125 µm holds about 25 kg — heavy enough to be worth carrying up a scaffold, light enough that somebody will. That combination, not the micron figure alone, is what makes the product work.

Outdoor storage

Standard polyethylene embrittles after a few weeks of direct sun. Where sacks are stored outside on a compound, specify the UV-stabilised grade; the cost difference is small and it prevents the failure where a pallet crumbles before it is used.

Segregation

Clear rubble sacks are worth the small premium where the site waste management plan requires inert waste to be segregated and audited. The gate check does not need to open a clear sack, which is one argument fewer at the weighbridge.