Product Info Catalog Building Materials Construction Panels Hem-Fir Strips, Corrugated, Hortizontal, 2.5-In., Must Be Purchased in Quaitites of 24. Hem-Fir Strips, Corrugated, Hortizontal, 2.5-In., Must Be Purchased in Quaitites of 24. Request a Quote UPC: 33069011083 Manufacturer: Crane Composites Inc SKU: 394056 Model Number: R79039 2-1/2", Corrugated Hortizontal Hem-Fir Strips, 1-1/2" x 8', Used To Support Fiberglass Panels Over Rafters.