Paint Film Components - National
Environmental Health Forum Monograph
   "Hundreds of kilograms of lead in paint are
readily present on the walls of older houses. A
'typical' painting regime is outlined for a house
built in 1900, having 280 m2 of wall area that
resulted in a paint lead loading value of 103 mg
Pb/cm2 such that the wall coatings would
contain some 288 kg of lead. A worst case
scenario indicated that some 364 to 644 kg of
lead in paint on the walls is possible."
http://www.health.vic.gov.au/archive/archive2014/nphp/enhealth/council/pubs/pdf/paint.pdf