Mixing Malarkey Shingle Run Dates and Plant Locations
Bulletin edition: August 2026
Malarkey recommends checking bundle lot numbers and manufacturing locations before installation. Similar run dates help maintain a consistent appearance
Malarkey technical bulletin: Mixing Run Dates on Shingles.
What this means for your roof
Malarkey recommends checking bundle lot numbers and manufacturing locations before installation. Similar run dates help maintain a consistent appearance. Different plants can use different raw materials and granule sources, making a visual match difficult even when the product name is the same. The bulletin warns against mixing plant locations on one roof.
A useful question for your contractor
Ask whether the bundles come from compatible runs and the same plant, and request a sample layout if the colors appear different.
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: August 2026. The date shown identifies the manufacturer document used for this summary.
Read Malarkey: Mixing Run Dates on Shingles
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.