The proper ventilation of attic areas is a critical design and performance consideration. If implemented correctly, proper ventilation methods can help ensure the maximum service life of roof assembly materials, and can improve energy efficiency of the building. The minimum amount of ventilation required is defined by
Read more →Snow and ice accumulation on steep-slope roofs can lead to ice dams at the roof eaves. Ice dams are typically formed by the repeated thawing and freezing of melting snow or backing up of frozen slush in gutters. When ice dams occur, water can be forced under
Read more →Ventilation is: Attic ventilation is the flow of outside air through the space at the underside of the deck of an asphalt shingle roof system. The benefits of ventilation are: Ventilation moves heat and moisture out of an attic space. Ventilation helps to prevent premature shingle deterioration
Read more →When the time comes to reroof an existing asphalt shingle roof, a decision must be made whether to remove the old shingles or apply new shingles directly over the existing layer. Most building codes define the options as follows: Reroofing: The process of recovering or replacing an
Read more →The ARMA Steep Slope Committee has established the following recommendations regarding the application of asphalt shingles directly over insulation, insulated roof decks, and radiant barriers. Shingle Application Directly Over Insulation Applying shingles directly over insulation is not recommended for a number of reasons: 1. Continuous free-flow ventilation
Read more →Sampling is the process of selecting material to be tested. For example, ASTM D3462 directs the user to consult ASTM D228 for guidance on selecting samples. D228 outlines a method for selecting samples that is referred to in the field of statistics as “lot-based” sampling. ASTM E
Read more →This bulletin provides general guidelines for reroofing using “metric” type asphalt shingles. Metric shingles are slightly larger than standard 12” x 36” shingles and typically measure 13¼” x 393/8”. Variations of two basic application methods are commonly used: bridging and nesting. Either method will provide satisfactory results
Read more →ARMA strongly advises against the application of any type of field-applied coating over installed asphalt shingles. There are many types and formulations of roof coatings so it is important to always consult the shingle manufacturer before proceeding with any type of coating. Be aware that some asphalt
Read more →The formation of a “tobacco-juice” residue, so named for its color, has been widely attributed to the weathering of asphalt roofing (i.e., roof coatings, base and cap sheets and shingles – to name a few) or the exudation of asphalt fractions from the roofing material, regardless of
Read more →Shingles that are in conformance with ASTM D3462 at the time of manufacture have a proven track record of performance, meeting and exceeding customer expectations. Asphalt shingles made with fiberglass mat are complex composite products made by combining materials with significantly different properties. Shingles that are in
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