Asphalt shingles:
Nowadays, most asphalt shingles have a layer of glass fibres instead of paper. They are referred to as composition shingles. Fibreglass shingles are lighter than their organic counterparts, because less asphalt is used during manufacturing. They are less expensive, more heat-resistant and the ''feet'', or notched ends, are less likely to lift, a problem often encountered on older roofs.
The fibreglass mat is surfaced with an asphalt coating, followed by mineral granules. An underlayment of asphalt-saturated felt should be installed over the roof structure prior to laying fibreglass shingles.