This led to the establishment of settler-colonies in Algeria, Tunisia, South Africa, Namibia, Angola, Mozambique, and central African areas like Zimbabwe and Zambia. Eventually the overriding economic factors led to the colonization of other parts of Africa.
(July 2009) (Learn how and when to remove this template message) Tar paper is a heavy-duty paper used in construction. Tar paper is made by impregnating paper or fiberglass mat with tar, producing a waterproof material useful for roof construction. Tar paper is distinguished from roofing felt which is impregnated with asphalt instead of tar, but these two products are used the same way, and sometimes are informally used as synonyms. Tar paper has been in use for centuries.
Rolls of 30-pound roofing felt provide an excellent waterproofing membrane. A roll of 30-pound felt will cover approximately 200 square feet. Since a square of roofing is 100 square feet, a roof of 25 squares will require 12.5 rolls of 30-pound felt. (25 x 100 = 2,500 SF; 2,500 divided by 200 = 12.5 rolls.) Waterproof underlayment provides extra protection.