Installation Instructions

Seneca Storm Windows

EcoShield Windows

PDF Version

Storm Window Installation Instructions

{Flange-type storm windows only}

The following must be done to insure warranty coverage. All storm windows are designed to be installed plumb, square and level. If the installer does not meet these simple requirements, the appearance, operation and weatherability of the unit will be affected.

Does the storm window fit?

Before preparing the existing window opening for the new storm window, place the new storm window in the opening. If the storm window came with a bottom expander, be sure to slip it over the bottom flange of the storm before setting it into the opening.

Set the storm window up against the blind stop from the outside of the window opening. If the casing is out-of-square, or the storm was ordered too large, you may have to trim some of the storm window flange (see "trimming the flange"). If the blind stops are less than 3/8" in width or your ordered the storm window too small, you may have to add some wood to the blind stop. Knife expanders can also be ordered from the manufacturer of the storm window to increase its size.

Once it is determined that the storm window will fit, take it out of the opening and set it out of the way. Be sure that the inserts of the storm window are still in the frame to help keep the frame square. Keep all installation clips on until the storm window has been completely installed.

Clean the mounting surface of the existing opening making sure it is free of caulk, paint or dirt buildup.

Apply a good bead of quality caulk or sealant to the mounting surface of the frame of the storm window. Be sure the bead is continuous and smooth along the head and both side jambs. No sealant is necessary along the sill in most applications.

Set the storm window back into the opening squarely and as centered in the opening as possible. Insert the supplied installation screws through the predrilled holes in the frame after lifting the storm up to the proper position. If you are required to drill installation holes in the frame, keep them between 16 and 21 inches on center. Be sure to fasten all screws straight into the casing; not at an angle. Push your bottom expander down into place.

Go inside the house and remove the installation clips. Operate all of the storm window inserts to be sure they slide freely. Remember that the winter closed position is the outside insert up, and inside insert down.

Congratulation! You have just professionally installed your storm window.

Trimming the Flange

If it becomes necessary to trim the frame down, follow these easy steps:

  1. Score the groove of the flange several times with an utility knife. * Do not reduce any one side by more than two grooves.
  2. After scoring, remove the excess metal with pliers.
  3. File the rough edges.
  4. Drill new installation holes if necessary.

Effective Date: April 11, 2011

Prices are subject to change without notice.

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EcoShield Window Systems, a quality product of Kasson and Keller Inc.
Manufacturing replacement windows, new construction windows, and storm windows since 1947

Product information on this site is subject to change without notice.
Please contact your dealer or customer service representative for the most up to date information.