Double Hung

Gravina's hung windows operate by sliding up and down vertically. You may choose to have the top sash non-operable making it a single hung or for both sashes to operate making it a double hung. On a double hung window both sashes “tilt” inside for cleaning ease whereas on a single hung only the bottom sash tilts in for cleaning. Hung windows rely on mechanisms referred to as balances. Balances allow for the sash to stay up.

Older style windows may have used a rope as a balance. The new balances are hidden behind the main frame so they’re less obtrusive to the eye. There are different types of balances; block-n-tackle and coil. Both give you superior performance. Hung windows will use cam locking systems for security.

Depending on manufacturer’s specifications one or two cam locks are standard. Double hung windows will come standard with a “night lock”. A night lock allows your window to maintain airflow while preventing the window from being open all the way for security purposes. When closing all windows will have an interlock system.

An interlock is where the two sashes meet in the locking position. Interlocks should be weatherstripped. Some interlocks will be reinforced by aluminum or fiberglass to prevent bowing of the sashes in the future. The fiberglass reinforcement is non-conductive yet maintains superior strength.