1. All installation tapcons in the sill/bottom of the window must be sealed using the following method:

• Using a hammer drill and 3/16” masonry bit, drill through the pre-punched holes in the sill into the concrete/wood buck.

• Remove the wood or concrete dust using a vacuum or brush.

• Apply enough urethane chalking into the hole, so that the chalking fills both the hole in the aluminum and concrete/wood buck (typically one trigger pull on your chalking gun).

• Using a #3 Philips bit and a screw gun, run the tapcon into the hole.

• Make sure the urethane chalk seals all the way around the tapcon.

• If shimming is needed between the bottom of the window and the wood buck, insert the shim between the bottom of the frame and the wood buck before drilling 5.

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2. If there is a gap between the window frame and the wood buck.

• Shims must be used to prevent distorting the aluminum window frame when tightening the tapcon. Distorting/bowing the window frame will affect the proper operation of the window.

• To ensure the shims do not become loose, run the tapcon through the shim when installing each tapcon.

• Use a razor knife to trim the excess shim after tightening the tapcon.

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3. To seal around the exterior perimeter of the window.

• Use urethane chalking.

• Make sure to apply the chalking thick enough to prevent cracking. Usually about ½" wide and ¼" in depth.

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4. If joining multiple windows together using a mull bar.

• Make sure to seal the window flange to the mull bar using 100% clear silicone.

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5. Make sure to add tapcons to all factory-drilled installation screw holes and install all plastic sash guides.

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