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.
There are three types of underlayment that can be installed on a roof: felt, ice shield, and synthetic. 1. Felt is tar or asphalt saturated paper made with some fiberglass. It is the most widely used and the cheapest roofing underlayment.he down side of an ice shield is that when it is installed over the entire roof deck, it also acts as a vapor barrier, which means that it traps water under the roof. Trapped water can cause the substrate to rot and will also lead to the formation of allergenic mold and mildew.