STEP BY STEP CANVAS STRETCHING
Assemble all materials and tools before starting.
In this example, we used pre-made stretcher bars that come ready to assemble. These stretcher bars come with cut grooves at each end for mating and interlocking to adjacent bars. You may need to sand rough edges on pre-made stretchers because the cutting tools used during the manufacturing process may leave wood burrs and sharp edges.
Make sure that you fully seat the two stretcher bar ends. If you see a gap along the seam where the two ends meet, then you have not fully mated the two bars.
In this view, all four stretcher bars shown mated together. However, we need to ensure that all four corners of this assembly are square. (i.e. A, B, C, & D)
We will need to check each corner to make sure they are square using a square ruler. It is a critical step because if your final assembly is not square, it may not fit into your frame.
Hold the square ruler as shown and check that both inside edges of the ruler run flush along the surface of each stretcher bar. If the ruler lifts off one side (not running flush along one surface while being thoroughly flush on the other) then your not square on that corner.
Using a mallet, gently tap the corner(s) to make adjustments.
Recheck corners until they are all square. Now you are ready to start the canvas mounting process.
Before laying down your giclee canvas print make sure there are no debris or wood pieces (that may have fallen off during stretcher bar assembly) which could damage the printed surface. Use a soft cloth work surface to minimizes the chances of causing small scratches to your giclee canvas print.
Lay down your print (face up) and make a final close examination to ensure there is no damage from the print supplier.
At this point turn over your giclee print so that the image is face down. You are now ready to position your stretcher bar assembly.
Place your stretcher bar assembly over your giclee canvas print as shown.
Starting with the right side, carefully lift the canvas print and ensure that the image is wrapping around the front face of the stretcher bar. Repeat this on the opposite side, moving the stretcher assembly left or right as needed until you see the image wrapping equally around both sidebars.
Once you have centered the stretcher bar about the printed image, draw a reference line along each side as shown. This reference line will come in handy later if the stretcher assembly moves out of position and you need to realign it.
As we did in Step 13 for the side positioning, we now want to center the stretcher bar assembly along the top and bottom bars. Carefully lift the canvas print and ensure that the image is wrapping around the front face of the bottom stretcher bar. Repeat this for the top stretcher bar, moving the stretcher assembly up or down as needed until you see the image wrapping equally around the top and bottom bars.
Once you have centered the stretcher bar about the printed image, draw a reference line along each side as shown. The stretcher bar assembly is now centered in both the vertical and horizontal directions about the printed image. We are now ready to begin the canvas stretching, wrapping, and stapling processes.
For this example, we have selected 1/4" staples. Load your staple gun so that you do not run out of staples part way through the next steps.
Starting with the top stretcher bar, wrap the giclee canvas print around the stretcher bar as shown. Be sure that the stretcher assembly has not moved out of the reference lines we drew earlier.
Holding the staple gun squarely on the canvas and stretcher bar, staple the canvas to the stretcher bar in the center of the bar as shown.
Check that your assembly looks like this - having one staple in the center of the top stretcher bar.
Sometimes the staple gun is not held square to the canvas and stretcher bar resulting in a partially inserted staple. Lightly tap the staple with a hammer until fully inserted.
We are now ready to tightly pull and wrap the giclee canvas print around the bottom stretcher bar. Using just your hand strength, stretch the canvas, wrap it around the bottom stretcher bar, and hold securely with your thumb (as shown) in preparation for stapling.
While still holding your thumb in place, insert one staple in the center of the bottom stretcher bar. Once you have added the first two staples into the top and bottom stretcher bars as shown you should notice a slight tension pull on the canvas between the two staple points (i.e., points A and B.)
As we did in the previous steps for the top and bottom, now we must secure the left and right sides. Starting with the left side, stretch, wrap and hold canvas securely in position in preparation for stapling. (Not shown: Insert one staple in the center of the left stretcher bar.)
As we did in the previous steps, stretch, wrap, and staple the right side. Be sure that when stapling opposing sides that you pull the canvas so that it does not droop or sag. Our assembly should now have one staple placed directly in the center of each stretcher bar as shown.
Flip over the assembly so that you are looking at the printed image on the front. Check that the image is centered both vertically and horizontally - you should see the image wrapping equally around all sides, and no 'white' border should be visible along the front face. Check that the image has not rotated clockwise or counter-clockwise so that it is no longer square with the stretcher bars. Also, check that the printed image is not overly loose or sagging. In the next steps we will tighten the canvas as we stretch, wrap, and insert the remaining staples, but now is the time to remove the staples and make adjustments if the position of the image is off or the canvas is very loose and sagging.
Beginning with the top stretcher bar (1), insert staples starting from the center staple and moving left with each new staple until you reach the left stretcher bar as shown.
Repeat the previous step for the bottom (2), left (3), and right (4) stretcher bars in that order. Remember to start from the center staple and move in the direction of the arrows (as shown) as you staple the remaining three sides.
Now we are ready to pull and stretch the canvas for the remaining unsecured areas. Starting with the top (1) stretcher bar, PULL THE CANVAS SNUG, hold it with your thumb and staple from the center to the right stretcher bar as shown. Repeat this process for the bottom (2), left (3), and right (4) stretcher bars in that order. IMPORTANT: You should notice that the canvas has more tension across the front face. It should not sag, droop, or have ripples along the surface. If any of these conditions exist, then you did not apply enough tension during the pulling and stapling process. If you determine that your canvas was not properly stretched you may need to remove all the staples and repeat the stretching and stapling processes. If you hear the sound of a drum when you tap your finger on the back of the canvas indicates good tension. On a small hand stretched canvas (as shown in this tutorial) it may sound more like a deep thud.
Now we must fold and secure the four corners. Hold the canvas material as shown.
While applying pressure, wrap the corner around the stretcher bar as shown so that the fold is on the side of the assembly. The fold should run at a 45-degree angle as shown.
While continuing to apply pressure on the canvas material, fold it around the back face and hold securely in the position shown in preparation for stapling.
While holding the corner in position, insert several staples as shown.
Repeat steps 30 through 33 on the remaining three corners. Be careful that your folded edges are always on along the side stretcher bars. Your finished assembly should look like this when viewed from the back. Now use your hammer to insert all staples fully.