Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles.
Roof to wall flashing over shingles.
Don t mistake this condition for headwall flashing routed beneath the shingles and call it a defect.
How to install roof flashing against a wall.
Step flashing redirects the water back onto the shingle.
Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.
Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
At the end of the vertical sidewall the step flashing shall be turned out in a manner that directs water away from the wall and onto the roof and or gutter.
However you ll want to check with your local building department before you make any decisions.
Proper roof wall flashing example.
The shape of vent flashing is typically a cylinder with a wide flange at the base which is lapped into the shingles as the roofing is installed.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
Step flashing fits to each course of shingles and appears to step up the wall of the chimney.
Install your underlayment completely and your shingles up to where the wall begins so that the first piece of flashing or the corner flashing will rest on a shingle.
Yes you can install a metal roof over shingles.
Vent pipe flashing fits over flues or pipes.
Flashing against a vertical sidewall shall be by the step flashing method.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
Step flashing built to protect joints between roofs chimneys and other objects like skylights this flashing steps up above the shingles and attaches to the object providing comprehensive water protection.
To install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.
The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide.
Flashing can be purchased in pre formed styles to help you install it more easily and these include.
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.
To make corner flashing take your tin snips and cut a 45 degree line from an outside corner to the center fold.
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.
