Technical Instructions For Flush Doors


Avoid dragging doors across one another and keep doors clean.

Store flat on a level surface in a dry, well ventilated building.

Doors should be conditioned to average prevailing relative humidity.

Doors should not be subject to extreme or rapid changes in heat or humidity. Avoid sudden changes such as forced heat to dry out a building.  Doors should not be delivered to the job site or installed until concrete floors, foundation, plaster, or drywall are cured.

In addition to finishing both door surfaces, all ends and edges must be sealed with an effective coating before installation to prevent undue moisture absorption.  Additional coats of the finish materials will increase resistance to moisture absorption.


Rails and stiles are 2.5”and are hardwoods therefore pre boring is recommended to avoid splitting.

Allow approximately 3/16” clearance on width.

Caution must be used to avoid impairing the strength of the door when trimming.  Trim no more than 3/16” from each side.

Use three hinges on all 1-3/4” Solid Core Doors.  Hinges must be set in a straight line to prevent distortion.

Jambs and stops must be set square and plumb

Immediately after cutting and fitting (before hanging) seal all cut surfaces and ends of doors with an effective coating.

Other Important Points

Finishes protect wood from moisture, handling or harsh chemicals. The sooner moisture is restricted from entering or leaving, the longer wood lasts and the finer it looks.  It should be noted, however, that finishing only retards moisture penetration, it will not prevent it.

The usage of High Gloss Laminate or high gloss finishes and polishing should be avoided as they tend to accentuate natural telegraphing.

Transparent finishes without stain provide a protective “window” for the wood, maintaining its natural look. Transparent finishes with stain provide the architect or designer an opportunity to create a striking visual effect by modifying the colour, look, and sheen.  Opaque finishes protect the wood and provide a solid colour “painted” appearance.