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Title
Asphalt Shingle Overlays – Concerns & Application Considerations
Asphalt Shingle Overlays – Concerns & Application Considerations
Date
9/2023
9/2023
Author(s)
Page(s)
1-6
1-6
Keyword(s)
asphalt; shingles; steep; slope; overlays
asphalt; shingles; steep; slope; overlays
Abstract
Section 1512.2.1 of the International Building Code (IBC) 1 allows for a roof re-cover under certain conditions. This acceptance is used for both low and steep slope roofs. The Western States Roofing Contractors - Steep Slope Roof Committee (WSRCA-SSRC) wants to express caution in this practice and why overlaying steep slope roofs may lead to unforeseen performance issues. This technical bulletin summarizes the issues with steep slope roof overlays, focusing on asphalt shingles, which can lead to a greater possibility of steep slope roof and sheathing deterioration, and interior leakage. This bulletin provides several installation recommendations for asphalt shingles if steep slope roof overlays are considered.
Section 1512.2.1 of the International Building Code (IBC) 1 allows for a roof re-cover under certain conditions. This acceptance is used for both low and steep slope roofs. The Western States Roofing Contractors - Steep Slope Roof Committee (WSRCA-SSRC) wants to express caution in this practice and why overlaying steep slope roofs may lead to unforeseen performance issues. This technical bulletin summarizes the issues with steep slope roof overlays, focusing on asphalt shingles, which can lead to a greater possibility of steep slope roof and sheathing deterioration, and interior leakage. This bulletin provides several installation recommendations for asphalt shingles if steep slope roof overlays are considered.