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Lug sills are window sills that project into the brick or stone work at either side of the masonry opening. They have flat ends that are embedded into the wall at usually no more than four inches deep. When using brick or stone they are usually set in a corresponding length of one–half, full brick, or stone lengths. The sill is set into place before any surrounding masonry work. It is recommended that lug sills are jointed because of the loading at the lug ends.


slip SILLS


Slip Sills are window sills that are made to fit the width of the window opening and are usually set into place after the masonry work has been completed. This helps protect the sill from any damage with further construction. The Slip sill is not embedded into the wall, therefore, a vertical joint is visible which can allow water penetration and must be watched.


Both sills are normally manufactured with a one-half to two inch lip overlapping the masonry material below. Drip edges help prevent water from returning to the wall. A drip edge is typically manufactured in the cast stone sill at one inch from the edge to prevent breakage. This drip edge is usually terminated one half inch from the edge of the masonry material opening when the end of the sill is visible.




The information within this and all our bulletins has been provided as a guideline and based upon statistical data and prior uses. We always suggest that you consult with your engineer, architect or contractor for the best design and use of cast stone for your project. Our design team is always available to answer any of your questions. We do not accept any liability from damages resulting from your interpretation of the data contained within.