TAMKO's notice permits a single layer of Moisture Guard instead of two layers of accepted saturated felt for the specified low-slope asphalt-shingle range. It also describes ventilation requirements when the membrane covers the entire deck
TAMKO technical bulletin: Use of a Single Layer of Moisture Guard in lieu of Two Layers of Felt for Low-slope Application.
What this means for your roof
TAMKO’s notice permits a single layer of Moisture Guard instead of two layers of accepted saturated felt for the specified low-slope asphalt-shingle range. It also describes ventilation requirements when the membrane covers the entire deck. This is a named-product detail, not approval to use any membrane on any low-slope roof.
A useful question for your contractor
Ask for the measured roof pitch and the exact underlayment detail used for that slope.
Ask for the answer to be tied to the actual roof condition and the exact product being installed. Keep the agreed repair or installation detail with your estimate and project photos.
Bulletin dated: August 28, 2019. The date shown identifies the manufacturer document used for this summary.
This homeowner summary explains the cited bulletin. The complete manufacturer document and current product instructions govern the installation details. A requirement for one manufacturer or product should not be transferred to another without checking.