b'Installing Patioor Entry DoorsInstalling Patio Doors or Entry Doors is similar to installingwindows. In New Construction, preparation of the openingwith proper flashing is key to preventing leaks and preserv-ing energy performance. Installing doors in replacementapplications is as complicated as replacing windows for thesimple reason the removal of the old door is as destructiveto the water management system as with any window tear-out.There are three considerations with doors that requireeffort in the preparation to be sure that the resulting installation (new construction or replacement) allows thedoor to operate properly and be weather tight:1. Level Sill. The biggest single problem source for poorly operating doors - either rolling or hinged - is anunlevel sill. As the artwork shows, a crown, a bow or a sill with one side higher than the other, will not allow theinterlocks and weather stripping to engage as designed. If you start with a level sill, good results from the installa-tion are all but assured. If you dont, then bad results willsurely follow.2. weather resistive Sill. In new construction,establishing a level and properly draining sill that expelswater and moisture that makes its way behind the weatherCROWN IN SILL UNLEVEL SILLBOW IN SILLWindow Fitters Guide to Window Installation107 2020 AWDI, LLC Do not reproduce without permission'