The direct scribing method can be used to scribe one, two or three walls with accuracy. To begin you need to determine the approximate locations for the seams and layout the material, accordingly.
Tools used for direct scribing include a bar scribe, steel square and a pair of dividers either straight or bent. (Both shown) Usually, the bar scribe is used on scribes more than three inches and the dividers are used for scribes less than three inches.
Photo 2: Establish positioning marks on the seam side of the material. The initial scribe is done on the long wall first. The object is to have the scribe line moved onto the material, the material cut, and the material moved into position.
Photo 4: Set the bar scribe to the distance that you need the material to move. In this instance the bar scribe is set to over lap the existing piece of material ½” to allow for later seam cutting.
The use of a direct scribing process keeps the margin of error at a minimum. It also helps keep the walls and casings from being marred like they would from a free-handing fit.