Roofing Technical Bulletins
Self-Sealing Asphalt Shingles – Technical Bulletin 1.0 – Seal Strip Considerations
This bulletin focuses on the asphalt seal strip of a conventional self-sealing asphalt shingle. Specifically, the document discusses what the seal strips are, how they work, why and when they must be supplemented with manual hand sealing, how to determine if a shingle was properly sealed before becoming unsealed, and varying degrees of asphalt shingle wind damage. The document contains a suitable method of repairing subtle wind damages, and notes a few other recommended considerations when evaluating these materials for wind damage in the field.
Self-Sealing Asphalt Shingles – Technical Bulletin 2.0 – Wind Resistance Basics
A brief bulletin that outlines the factors that can and cannot be controlled in any asphalt shingle roof, a useful comparison of asphalt shingle warranties across manufacturers and products, conventional installation instructions highlighting areas important to wind resistance, and examples of properly and improperly sealed shingles.
Self-Sealing Asphalt Shingles – Technical Bulletin 3.0 – Is My Roof Wind Damaged? Is Wind the Proximate Cause?
This bulletin is designed to be a clarifier on the all too often confusing subject of wind damage analysis on conventional asphalt shingle roofs. It offers an unbiased and objective definition of wind damage to an asphalt shingle roof. The document clarifies “proximate cause” in asphalt shingle wind claims. Was the damage due to the wind or one or more other common causes? The bulletin provides a brief background on how wind affects simple roof geometries, defines what a “severe” wind really means and what damage from “severe” wind commonly looks like, and then provide common examples of damages that could have been avoided.
Ice damming Basics - Technical Bulletin
A brief bulletin that explains how ice damming can cause acute damage from water entering through the roof when there is improper ventilation or insulation in the attic. This occurs when snow on the roof melts on the roof over the warmer attic, then re-freezes near the eave – causing a “dam”. More melted water is trapped behind the “dam”, causing water to back up under the shingles or flashing and leaking into the attic space. There are collateral indicators Donan professionals look for after the ice is gone to determine if a problem was the result of ice damming or another cause.
