Siding Inside Corner

Trim Purpose

Specs, MSDS, and LEED Information for Flannery Trims & Products

Flannery’s Siding Inside Corner is a trim that creates a sharp and crisp corner where siding is installed on walls that meet at a 90° inside corner joint. The Inside Corner trim creates a solid and clean corner for the siding system which would normally require the two pieces of siding to be laid together at an inside corner. With a 1″ face flange, the Inside Corner allows the installer to slide the siding in behind the flange and cover the unfinished edges of the siding. The larger face leg of the Siding Inside Corner allows for the possible expansion or contraction of the siding along a horizontal run.

Manufacturer's Specifications

Flannery’s Siding Trims are standard extruded aluminum alloy 6063 T5 and have a .050” nominal wall thickness. Aluminum panel trims come in 10′ lengths and shall have a standard Clear Anodized Finish. Mill Finish (for field priming & painting), Chem-film finish or other factory finishes and custom paint orders are available. Flannery has a limited stock of factory paint colors to match Trugrain made with Resysta stains, please call for availability. Click on Info Tab above for Factory Finishes.

Part No. “A” Width “B” Width Siding Compatible Stock Item
SIC 625-100 5/8″ 1″ TGR 1/2″ Siding Flatboard Yes
SIC 875-100 7/8″ 1″ TGR 3/4″ Hollow Board Yes
Cement Panel Inside Corner Reveal A B Dimen Scale R3 1000 BjB 300x300 - Siding Inside Corner

Installation of Siding Trims must be in accordance with the Siding Manufacturer’s Instructions. For TruGrain made with Resysta Siding’s installation instructions, please visit their website,

06 Siding Inside Corner Install Detail R5 1000 BjB 1 - Siding Inside Corner