Measure trim, weatherstrip and sealant along the actual paths

Trim, weatherstrip and sealant may follow different parts of the same opening. Mark each path on a sketch rather than using one perimeter for every material. Some details use three sides, some four, and some more than one run.

Start with a perimeter check

An illustrative 1.2 × 1.5 m rectangle has a four-side perimeter of 5.4 m. Two such openings total 10.8 m before cutting or joint allowances. A three-side head-and-jamb trim would instead be 1.2 + 2 × 1.5 = 4.2 m per opening.

Convert sealant geometry carefully

For an illustrative rectangular filled joint 20 m long, 10 mm wide and 6 mm deep, the volume is 20 × 0.01 × 0.006 = 0.0012 m³, or 1,200 mL. At 300 mL per cartridge, that is four cartridges before allowance. The dimensions illustrate arithmetic; they do not specify an acceptable joint profile.

Check the actual joint

Backer material, profile, movement requirements and the selected sealant affect the filled section. A triangular bead is not the same volume as a rectangle with the same width and depth. Weatherstrip profiles and compression requirements also need product selection.

Prepare separate order lines

List trim cut lengths, weatherstrip paths and sealant quantities independently. Use confirmed opening and fabrication details, then add the appropriate product-specific allowances. The calculator does not determine glass clearances, weatherproofing adequacy or compatibility.

Found a measurement or calculation issue? Send the example and your correction.