IKO Shingle Mixing on Large Roofs: Check the Production Codes
Bulletin dated: April 2020 revision
IKO distinguishes typical roofs from very large uninterrupted roof planes. For a plane exceeding 100 squares, this revision requires shingles from the same production run and matching four-digit codes
IKO technical bulletin: TBR75 Shingle Mixing on Large Roofs | Product Bulletin.
What this means for your roof
IKO distinguishes typical roofs from very large uninterrupted roof planes. For a plane exceeding 100 squares, this revision requires shingles from the same production run and matching four-digit codes. That exception matters for large buildings where small tonal differences become noticeable across many bundles. The source was first dated April 2015 and revised April 2020.
A useful question for your contractor
Have the production codes been checked for each large uninterrupted roof plane?
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: April 2020 revision. The date shown identifies the manufacturer document used for this summary.
Read IKO: TBR75 Shingle Mixing on Large Roofs | Product Bulletin
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.