Flashings, A lap joint or a turned up flange, usually of metal to make a watertight connection between two (2) different materials.
A. Material:
1. Copper: Sixteen (16) ounce soft (roofing temper).
2. Galvanized sheet metal: Twenty six (26) gauge, one and twenty five one-hundredths (1.25) ounce (total weight both sides) zinc coating per square foot.
3. Lead: Hard lead, two (2) pounds; soft lead, four (4) pounds.
4. Tin: Forty (40) pound coating, painting both sides.
5. Membrane waterproofing material acceptable to Building Official.
6. Copper and zinc flashings, gutters and downspouts not to be used in conjunction with each other.
B. Openings Not Protected by Overhang:
1. Heads of openings, wood frame walls:
a. Sheet metal extended behind finish siding material and turned down over outside edge of head trim unless drip cap extends behind the above bottom of finished material; or
b. Three (3) ounce copper coated building paper may be used, provided flashing is not exposed to weather more than two inches (2"). Extend behind siding. Blank tack at outside edge of drip cap, one inch (1") on center.
2. Heads and sills of openings, masonry-veneered wood frame walls.
a. Material: Sheet metal or membrane waterproofing material acceptable to Building Official.
b. Head Flashing: Extend from front edge of lintel, up and over top of lintel and up on sheathing under building paper.
c. Sill Flashing: Extend under masonry sill, up on sheathing and under wood sill.
3. Heads and sills of openings, masonry walls:
a. Material: Sheet metal or membrane water proofing material acceptable to Building Official.
b. Head Flashing: Extend from front edge of lintel, up and over top of lintel, through wall and turn up one inch (1") on inside surface.
c. Sill Flashing: Extend under and behind masonry sill.
4. Heads of openings, stuccoed wood frame walls:
a. Material: Sheet metal.
b. Drip: Form drip on front edge of drip cap and extend flashing up behind building paper underneath stucco.
C. Intersections:
1. Provide sheet metal flashing for all horizontal and vertical intersections of stucco with other materials.
2. All flashing in connection with masonry walls shall have flashing or counter-flashing built into masonry not less than one inch (1").
D. Valleys:
1. Rigid shingle roof covering:
a. Flash with sheet metal.
b. Flashing on:
(1) Roof slopes less than seven (7) in twelve (12), width eighteen inches (18").
(2) Roof slopes seven (7) in twelve (12) or more, width twelve inches (12").
2. Asphalt shingle roof covering:
a. Flash with sheet metal; or
b. Two (2) thicknesses of mineral surfaced roll-roofing material cut from rolls weighing not less than eighty five (85) pounds per square. Bottom strip, eighteen inches (18") wide, top strip at least thirty six inches (36") wide, lapped twelve inches (12").
E. Roof and Wall Intersections:
1. Sloping Roof: Sheet metal flashing.
2. Flat Roof: Sheet metal or same material as roof covering. When sheet metal is not used, install forty five degree (45°) cant strip at roof and wall intersection.
F. Terrace or Porch Slabs. Suspended (reinforced) type or bearing on the ground, which abut wood construction at exterior wall.
1. Flashing Material: Sheet metal.
2. Extend flashing at finish floors of terrace or porch from one-fourth inch (1/4") outside exterior face of finish, turn up four inches (4") behind exterior finish, thence turn down and through wall under wood construction to one-half inch (1/2") beyond inside face of foundation. The horizontal projection of the flashing under the exterior finish is to be turned down the sides of the terrace or porch slab to the level where the flashing goes through the wall.
G. Chimneys:
1. All chimney and roof intersections, sheet metal flashing.
2. Cricket or saddle covering: Sheet metal. (Ord. 0-71-12, 3-11-71)