Issues with your counter flashing are normally the number one reason why a bay window can leak.
Bay window roof flashing.
The flashing needs to be installed before installing the roof shingles the metal flashing is formed with a hook edge and cleated on 12 centers the flashing extends up the wall at least 4 the flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
Flashing bay windows featuring master mason bryan light the brick masonry techniques for builders dvd demonstrates construction techniques with brick that.
We always apply i w before all flashing details as a temporary dry in procedure and second layer of defense against leaks.
Nail it in place.
Also the flashing attaching it to the wall leaves a lot to be desired.
Roofs peel off from the edges so it is critical to hold them tight with the roof deck sealed on the outside we turn to flashing the edges with metal and membranes metal drip edge flashing image details roofing wrb flashing.
Also each part of the roof requires the correct flashing so you know there will be a tight seam where the materials join.
Bay windows require a special way of connecting the roof to the side of the home because of the way the roof line runs up.
Apply silicone caulking to the backsides of the flashing and place it so that the vertical section covers the overhang of the lip of the roof while the horizontal section lays flat on the roof.
We would have used a longer step flashing along the angled walls of the bay porch roof intersection.
On the front of the bay a layer of shingles can cover the flashing if you need to hide it.
Also seen on slate roofs or a tiled roof where it meets a wall like a porch as well as conservatory roofs car porches and lean to s around bay windows this list really does go on and on apron flashings if you are new to roofing or fitting roof flashings this really is a bread and butter place to start master this and the slightly more difficult flashings like step flashings will seem a lot easier.
Replace lead and flashing above bay window dig out and waterproof flashing on roof terrace.
The problems i had are that the lead roofing above my bay window approx 3m x 0 5m is old and has split causing it to leak through into living room.