Malarkey distinguishes manufacturing-defect coverage from damage caused by inadequate ventilation. Its bulletin says the defect warranty remains in effect, while problems attributable to a lack of ventilation are excluded
Malarkey technical bulletin: Installation of Malarkey Roofing Products Shingles Over Unvented Roof Assemblies.
What this means for your roof
Malarkey distinguishes manufacturing-defect coverage from damage caused by inadequate ventilation. Its bulletin says the defect warranty remains in effect, while problems attributable to a lack of ventilation are excluded. Avoid treating this as either a blanket warranty cancellation or blanket approval of every sealed-attic design.
A useful question for your contractor
Ask for the proposed roof assembly and its warranty implications to be reviewed before changing attic insulation or ventilation.
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 edition: February 2022. The date shown identifies the manufacturer document used for this summary.
Read Malarkey: Installation of Malarkey Roofing Products Shingles Over Unvented Roof Assemblies
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.