Flashing a new patio door?
We’re building a new home, and will be having a 6′ wide vinyl patio door installed. It does not include nailing flanges or any brick mold casing. We have 6″ walls, and I’ve been told the jamb of this patio door is 5.5″ deep – which seems an odd size. Too wide for a 4″ wall, and too narrow for a 6″ wall (doesn’t include sheathing or drywall depth). We’ll be installing vinyl siding on the exterior of the house.
My biggest concern is properly flashing this door, without a nailing flange or any casing. I plan to use a Jamsill sill pan under the door, and flashing the rough opening down over the sill pan. But I’m not sure how to best flash the sides and top of the actual door jamb without an integral flange or casing to work with. I think the door is designed to be installed flush with the exterior sheathing, but I’m not really sure.
I asked the manufacturer for installation instructions, but that only showed how to put the door together – and nothing about flashing or weatherproofing the installation, or even the depth to set the door inside the rough opening.
Any suggestions on how I can best flash this door? (or additional questions I should be asking?) Thanks.