A roof or wall that is not properly sealed off from water can be extremely costly to fix not to mention the hassles that accompany the unwanted water.
How to roof against a wall.
If the roof runs flat up against the brick wall you must install the roof side of the flashing either under the last layer of shingles or over the roof material if it is metal.
Normally this wall would have a house wrap on it like tyvek.
How to install roof flashing against a wall with a corner when there is a corner where the roof meets the wall you will need a corner flashing piece.
Figure 1 roof plane butting against wall.
A corner flashing piece can either be bought from the hardware store or it can be made using a regular step flashing piece.
On lean to roofs where a sloping roof plane meets the siding endwall flashing is necessary to prevent leaks.
Flashing is usually made of sheet metal and is used to seal and protect joints in a building like those where a roof meets the brick walls of a chimney from roof leaks by directing the flow of.
Metal flashing also called roof flashing goes against a stucco wall to protect it from water damage.
Here is an attempt though maybe not a very good one to make the roof flashing serve also as a through the wall flashing with a tile roof.
In this case we ve gone against new construction.
The proper installation of flashing at the point where the roof meets wall is to use metal step flashing.
Figure 2 step flashing.
Below are two photographs of roof wall step flashing completed and effective of a slate roof against a brick wall below left and in process with step flashing against a dormer sidewall before the dormer siding has been put in place below right.
Flat roof and flashing against brick wall install base flashing under shingles or over metal roofing material.
Proper roof wall abutment flashing examples.
There you have a z trim and an end wall flashing that have been joined using a stitch screw.
Sheet of housewrap or even better a piece of self adhering roof underlayment to the wall before the first truss or roof rafter is placed against it.
Follow the photo for illustrated instructions.
The flat roofing material must go up the wall a minimum of 12 or up the wall and over the top of the wall if the wall is less than 12 high.
In an existing construction you might have siding whether it be vinyl wood or brick.
Metal step flashings are pieces of metal that are shaped like an l at least 5 inches wide and tall and 8 inches long as shown in figure 2.
Housewrap creates the foundation.
Even though roof flashing is one of the most important elements of a roof not many people know how to install roof flashing against a wall properly.
For areas where the walls meet the roof you will need to use the step flashing technique.
