Cement and Clay Tile Roofing

1. Roof deck must be solid sheathing, either plywood or original plank board construction. Any large voids must be replaced or covered with sheet metal.

2. Fill in between existing spaced sheathing boards is allowed.

3. Tile installation may not be applied directly over rigid insulation board.

4. Tile recovers over any other roof are not allowed.

1. A minimum 30# felt underlayment is required on slopes of 3/12 or greater. The underlayment must be turned up 4 inches under the flashings on all vertical walls.

2. A mineral surfaced cap sheet may be required for some applications.

3. All sheet metal valleys shall receive a felt underlayment equal to the roofing underlayment.

4. Application of tile on slopes of 2/12 or less should be over an impermeable membrane where the tiles are installed for aesthetic purposes only.

C. BATTENS:

1. If required, battens shall be 1 inch by 2 inch boards nailed with 8d nails at 24 inches on center, or stapled at 12 inches on center.

2. For slopes 3/12 or greater, drainage around the battens may be provided by one of the two following methods.

a. Provide a 1/2 inch break every 4 feet between battens.

b. Install 3/8 inch shims under the batten with moisture resistant lath or strips of decay resistant material such as asphalt shingle or mineral surfaced roofing material.

Batten Installation

3. Nailing of tile over battens shall be according to manufacturers specifications.

4. All tile on non batten applications shall be nailed.

1. Nails shall be EG type, 7/16” head, long enough to penetrate 3/4” into or through the sheathing board or batten.

2. Shorter fasteners are acceptable for use at overhangs and eaves to minimize penetration of the visible underside.

E. VALLEYS:

1. 28 gauge, 24” wide, W type metal valley with hemmed edges may be used. The tiles should overlap a minimum of 6” on each flange.

FINISHED VALLEY

1. May be reused if in serviceable condition and the proper type for a tile roof.

2. If counter flashing is replaced, it may be fastened to the chimney with concrete nails and sealed with a good exterior caulk.

3. A separate sub base flashing installed with the underlayment may be required with some applications.

Sub-Flashing

4. High profile type tile require flashing which mold to the profile of the tile.

Lead Flashing

1. May be reused if in serviceable condition and the proper type for a tile roof.

2. Plumbing pipes may be sealed to the flashing with flashing tape, rubber collar, or plastic cement.

3. Painting of flashing to blend with the roofing is desirable but not required.

4. Exposed galvanized nails in base flashing are acceptable.

5. Some installations require separate flashings installed with the underlayment.

6. High profile type tile may require a flashing which molds to the profile of the tile.

1. Edge metal is required to cover exposed edges of plywood.

2. Painting of edge metal is not required.

3. When flashing against a vertical side wall:

a. New flashings may be installed if feasible. The galvanized pan flashing should be 4 inches by 6 inches with a 3/4 inch hem.

b. The portion of the tile headlug resting on the flashing shall be removed to prevent water damming.

c. No nails may be driven through the pan flashing. Wire ties or an approved adhesive may be used to secure the tile.

4. When flashing into a vertical top wall, a weather block should be installed. On a high profile tile, the weather block should mold to the profile of the tile.

1. Ridge should be installed with one nail into the supporting member.

2. Mortar, pressure sensitive material, or specially fabricated flashings may be used to seal the ridge.

3. Spacing of ridge shingles shall match that of the field shingles unless otherwise specified by manufacturer.

4. Rake tiles shall be fastened with two galvanized nails.

1. Raised fascia shall require anti-ponding by either a metal flashing sealed to the underlayment or a tapered cant strip installed under the underlayment.

2. A metal bird stop may be used on flush deck applications.

K. BUILDING DEPARTMENT INSPECTIONS:

1. In-progress inspections should include spot checks of decking, plywood nailing, tile application, and flashing installation.

2. Final inspections should be done from the ground to prevent damage to the roofing material.