On nailable sheathing, the flashing should be fastened with wide head nails or cleats. Nailing through flashing prohibits movement and should be avoided when movement is expected. The nail should be driven just above the upper edge of the flashing, allowing its wide head to hold the copper sheet. Nails or cleats should be spaced no more than 12" O.C. Copper is malleable, strong and has a high resistance to the corrosive effects of mortars and wood- preservatives. Cold rolled copper is recommended rather than soft copper as it offers more resistance to expansion and contraction stresses, although soft copper is useful where there are complex roof shapes. Upon completion of each area of soldering, carefully remove flux and other residue from surfaces. Neutralize acid flux by washing with baking soda solution, and then flushing with clear water rinse. Use special care to neutralize and clean crevices.

Roof flashing is a thin material that roofers and builders use to waterproof areas of the roof, particularly areas that are at risk of leaks. Flashing directs water away from at-risk areas (such as where the roof plane meets a vertical surface) and allows it to flow off the roof and into the gutter. Aluminum: While some materials are stronger and others cost less, aluminum remains the most popular choice of flashing among most homeowners. Aluminum makes a good balance for flashing material if you are on a budget but still want quality. Counter-flashing– This is paired with base flashing to protect the upper edge of the base flashing, creating a much stronger seal. It’s commonly made from aluminium. Copper is a longer-lasting solution, but is much more expensive.

THIS SECTION USES THE TERM "ARCHITECT." CHANGE THIS TERM AS NECESSARY TO MATCH THE ACTUAL TERM USED TO IDENTIFY DESIGN PROFESSIONAL AS DEFINED IN THE GENERAL AND SUPPLEMENTARY CONDITIONS. PART 1-GENERAL 1.1 SUMMARY Although copper flashing is not adversely affected by the corrosive alkalies present in masonry mortar, it's long term performance can be compromised by excessive chlorides. Therefore, chloride based additives in the mortar should be avoided.

INSERT OTHER SPECIFIC INSTALLATION REQUIREMENTS FOR OTHER SYSTEMS AND SHEET METAL ACCESSORY ITEMS SPECIFIED AS WORK OF THIS SECTION. 3.3 CLEANING Expansion joints should be provided for long runs of metal flashing to allow movement without causing deformation. Fabricate corners from one piece with minimum 18-inch (450-mm) long legs; solder for rigidity if required; seal non-soldered weather joints with sealant.As a roofer or window installer, it’s important to select the correct flashing type that pairs with your roof window and roof material. Soft zinc" is a newer, proprietary flashing material. It is a relatively malleable material, making it useful for complex roofing connections. It provides normal soft soldering capabilities and delivers easy folding. Soft zinc is said to be an "environmentally friendly" replacement for lead flashing; like lead, it is recyclable, while avoiding lead-contaminated runoff. [13] Types [ edit ] The flashing visible here is the apron below the dormer and the valley flashing in the open valley. The step flashing (soakers) are properly installed underneath the roof and wall shingles and thus is not visible. Hôtel Demoret Moulins, France You probably are familiar with the shingles on your roof, or whichever other type of covering keeps your home dry and safe. However, amidst these popular materials is the perhaps less popular but equally important roof flashing material.

Copper– Longer lasting than aluminium and has the same malleable properties, but it is usually more expensive. It’s most commonly used for chimney flashing. Different slate profiles, roof materials such as corrugated roofing, roof pitches and the number of windows you’re installing all impact which flashing is most appropriate. If valley length exceeds 12-feet (3600-mm), increase width of valley flashing by 1-inch (25-mm) on each side per 96 inches (2400-mm) of valley length. Industry Standard: Except as otherwise shown or specified, comply with applicable recommendations and details of the "Copper in Architecture" handbook published by the Copper Development Association Inc. (CDA). Conform to dimensions and profiles shown. Copper is an excellent material for flashing because of its malleability, strength, solder-ability, workability, high resistance to the caustic effects of mortars and hostile environments, and long service life (see: copper flashing). This enables a roof to be built without weak points. Since flashing is expensive to replace if it fails, copper's long life is a major cost advantage. [10] [11]The majority of materials used for flashings are thin, malleable metals, with the three most popular being:

Loudon, J. C.. An encyclopædia of cottage, farm, and villa architecture and furniture; containing numerous designs for dwelling … each design accompanied by analytical and critical remarks .... London: Longman, Rees, Orme, Brown, Green, & Longman, 1833. 126. Print.

Nails can sometimes lead to issues with inflexibility – not allowing the roof to expand and shrink in different weather conditions – so roofing cement is usually preferable. Examples of flashing on roof elements