What is the best way to attach rowlock sills when through-wall flashing beneath the sills must extend to the wall face?
Rowlock sills must be anchored either along the bottom or along the back face. If anchors are used along the bottom, they must extend through the flashing. Any penetrations through the flashing must be sealed. I recommend using anchors that are attached to the backup and extend forward into the joints between the rowlock bricks. These anchors also will penetrate the flashing; however, because the penetration is in a vertical plane, it is less likely to result in a leak if the seal is less than perfect. Anchors at the bottom surface also can be sealed adequately with proper care and a compatible sealant. With some metal flashing, a sleeve or cap can be placed over a dowel and soldered to the flashing.