they are cheap and available locally at all places
they are durable and possess fairly good Strength and lighter than stones
they have very good insulating property against heat and sod
all the above
Discuss in Comment
"Scientists dream about doing great things. Engineers do them."
PSC Advertisement ⏩ | Federal PSC | Bagmati PSC | PSC Karnali | PSC Lumbini | PSC Sudurpaschim | PSC Gandaki | PSC State 1.