also increases the surface area of the inner surface of the channel 808 which consequently increases the friction between the inner channel 808 surface and the inserted fabric covering material 816 with respect to fig8 and 10 a circular inner surface of the channel 808 allows for easier installation of the fabric covering material 816 the typical awning fabric utilized as a covering material tends to be quite stiff because it is usually stored in rolls this imparts a natural tendency for the material to want to curl when unrolled to leverage this natural tendency for the covering material to curl an essentially circular channel 808 is provided thus the natural curl will tend to cause the fabric covering material 816 to lay flat against the inner surface of the channel for easier insertion of staples 812 or other attachment means the framing member 810 is constructed from metal preferably aluminum aluminum is chosen because it is lightweight rigid corrosion resistant easily formable and relatively inexpensive also aluminum readily accepts metal staples 814 such as steel or stainless steel that are typically used to retain the covering material 816 the framing member 810 can also be manufactured from other more rigid materials such as galvanized steel for use in areas with high wind loads when galvanized steel is used an aluminum insert.