Best Practice way of Mitering
The engineered, industry-certified fitting system designed to ensure maximum waterproofing and structural longevity.
Precise tight measures & cut guide
To achieve a perfect seal, measurements must be taken from inside of the frame profile (the true inner dimensions) as detailed below.
Piece 1: Exact base dimension
Cut to the exact tight/inside measurements of your window frame to set the baseline height anchor.
Pieces 2 & 3: Left & right clearance
Cut shorter than tight/inside frame measurements by exactly 3mm to permit proper fitting expansion.
Piece 4: Top profile clearance
Cut shorter than tight/inside frame measurements by exactly 3mm to round out the perfect structural fitment.
What we mean by a tight measure when measuring
Miter angle configuration & profile alignment
Visualizing physical corner setups and our clean structural alignment profiles.
Key installation principles
Ensure you adhere to these physical limits during your site cutting and miter prep.
Under-miter clearance
The 50–60° corner fits directly UNDER the 45° corner, yielding a perfect single miter seam that forces water away.
Avoiding material collision
While degrees between 50° and 90° can be used, care must always be taken to prevent backend material interference.
Tight measure definition
Measurements are taken directly from the frame's true inside face on the left, to the frame's true inside face on the right.