Standard-sized sash for use on the frame come 3 by 6 feet. If you purchase this, you will have to govern the width and length of your frame accordingly.

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However, you can use any kind of window frame, and with so many home owners converting wooden window frames to aluminum, you may be able to get wooden storm sash for little or no cost from almost any window or wrecking company, or through a want ad in your local paper. It may be easiest for you to obtain the sash and then construct the frame around it.

For my own cold frame, I decided I would connect it to my garage. The height of my cold frame measures 18" in the back. In the front, it slopes 8". We do this to allow the water to have a place to run off from. Lumber, 2 by 12 inches, 14½ feet, forms the front. The sides are 28 inches long.

The lights (three storm sash) are hinged on a 2 by 4 wooden strip which is nailed to the garage wall. If you live in a cold climate and plan on using the cold frame for year-round growing, build it on a concrete or brick foundation which extends below the frost line. In my area the building code specifies that the frost line is 42 inches deep.

One precaution you have to take when it comes to cold frames is you have to be sure you don't over heat your plants. During sunny days, even during winter you have to be sure that you have enough ventilation and air flow through the cold frame.

If you don't have the proper ventilation, heat can rapidly build up within such a small confinement of the cold frame. If this heat builds up too much, you're going to wind up frying all your plants. You definitely don't want this to happen.