NATIONAL FLAG PROTOCOL

• No other flag must fly higher.
• When displayed or flown alongside other national flags, the National Flag must be displayed or flown at the same height as the other national flags, never lower.
• When displayed alongside provincial, military or corporate flags, the National Flag must be higher.
• When tied to a mast, it must be tied only at the left (at the beginning of the white bar) and left to fly freely without any obstruction.
• Must not touch the ground, shoes or feet or anything unclean.
• Must never be flown in darkness.
• Must be raised at dawn and lowered at dusk (except on the Parliament of Pakistan, which is the only official building on which the flag is never lowered). When flown over the Parliament of Pakistan at night, it must always remain alit with artificial light.
• Must not be marked with anything (including words, numerals or images).
• When raising or lowering: (i) must be saluted to by all uniformed personnel, (ii) others must stand in attention.
• Must be raised or lowered ceremoniously.
• When displayed horizontally, the white strip must always be at the left, with green field on the right
• When displayed vertically, the white strip must always be at the top, with green field at the bottom.
• Must not fly or be displayed upside down or with the crescent and star facing left.
• Must not be displayed anywhere where it is likely to get dirty.
• Must not be set on fire or trampled upon.
• Must not be buried or lowered into a grave (when burying a flag-bearing casket, the National Flag must be detached from the casket and held above the grave as the casket is lowered or removed from the casket before burial).

Source: 

Wikipedia.org