—STOCK 5 1/4 JAMB COMBINATION DOORINSTALLED HERE REDUCING MOULD STOCK 5 tAjamb COMBINATION DOORINSTALLED HERE EXTENSION JAMB … Detail No. 1 Detail No. 2 Extension Jambs for Masonry Walls are applied in grooveof regular jamb. On deep jambs, cut stock wood sill tobutt against extension jamb or omit if masonry sill isused. Then proceed to install frame same as for framewalls. On Openings narrower than 3 0 wide, a wider Inner…