Copper flashing is used to fix the roof with a copper sheets to stop any water leakage. This is done where the wall meets the roof. Base flashing and counter flashing are the two copper flashing involved in this process. The water from counter flashing is diverted to the base flashing. The base flashing will divert water to composition flashing. There is a minimum weight for copper flashing and counter flashing which is 16 ounces.
Copper counter flashing has many uses:
Soldering Basics – How to flash copper:
- This attaches and seals the copper. A receiver made in copper is positioned at the joint between two brick layers in the wall. The counter flashing is positioned in such a way that it is locked on the edge of the receiver.
- In the second method a wood or a strip is used to separate is cast into the concrete wall. The flashing is then inserted into this strip and is held in position by wedges. The strip portion is then filled with a sealing material.
- To cover exterior counter flashing this is used. The Top portion of the flashing is wrapped by paper used in building. The paper is 4″. The paper is held to the sheaths with a T shaped wooden or metal strip. The T shaped piece can be replaced with wide head nails, but they should not touch or penetrate the flashing.
- The nails hold the flashing up.
Second: Vertical wall flashing
A vertical wall is flashed in this method. The roof has squares which are locked to the base flashing. The base flashing will extend to a length 8″ up.
Third: Brick wall flashing
In brick wall flashing, Copper flashing is installed to the wall made of bricks. The joint in the bricks is 2 inches of depth. A strip made of wood or metal is formed, making it similar to the first process. The counter flashing is now inserted into this strip and are fixed by the wedges. They are then sealed.
Fourth: Wall intersection:
A cap made out of copper is used in flashing. This cap will extend over the base flashing intersecting the roof and wall. The cap flashing is situated at the joint between bricks. The edge at the bottom is attached and covers the base flashing. This forms a closer fit against the base flashing. The space between base flashing and roof is approximately 12″. The base flashing runs 4″.
Fifth: This is same as the first, but the receiver will hold the upper flashing edge.
Sixth: A Cut is used to hold the flashing with wedges and sealed.
Seventh: Attach a cap flashing to the wall and it is attached to base flashing. Blind riveting method is used.
Seventh: Standing and batten roof
The copper roof is turned upwards to form the base flashing. They are held by the receiver and locked. The counterflashing covers 4″.
Eighth: Batten seam roof
The top of the roof is made into a pan shape. The edge falls above the finished edge and copper flashing is locked here.
Ninth: Standing seam
The standing seam is of 8″ and laid flat on the wall. It is folded and copper pieces shaped in T are used to hold them.
Note: see the ‘How to solder copper roofing’ article on soldering copper