The standard casing overlap for most wood windows and doors is 11/16”. This will vary depending on product type. For Wood Ultimate Casement, Wood Ultimate Double Hung or Wood Direct Glaze, please consult the wood round top direct glaze Architectural Detail Manual (ADM), page 24. The overlaps listed are true for round tops and rectangular windows. If a direct glaze is going over an in-sash window the overlap will change to match the in-sash window.