March 21, 2025

Subject: Residential Roofing Price Increase

Dear Owens Corning Canada Residential Roofing Customer:

Owens Corning Canada, LP is announcing a price increase of 10 percent on all shingle
and roofing accessory products, effective April 21, 2025.

This increase will apply to all shipments on or after April 21, 2025, regardless of order
entry date.

Thank you for your business and continued support of Owens Corning. Please contact
your Area Sales Manager with any questions.

Regards,