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.
As Sarking (or underlay), I refer to the waterproof membrane put under the battens of the roof. It is very important, because helps in regulating the temperature of the house, and to protect it from insects and wind. Without a good sarking, the roof would become moldy, and your tiles will look dirty green. sarking like that will have to be changed in few years time, and would be very costly. The sarking is the underlay of the roof, and a strong roof needs a strong sarking. Pay attention to that.