See Fig. 22 and 25 for Ondura installation at a slope change. Flashing width should be increased as slope differences increase or whenever water build-up on the lower slope can be substantial.

Sidewall Flashing

See Figures 23 and 24 on how to flash when Ondura roofing meets a sidewall.

Pipeflashing

The Ondura pipeflashing accessory is available in two sizes, can be used with hot or cold pipes, and is ideal for flashing turbine ventilators, metal chimneys, and ventilation pipes. Read the instructions on the following page and choose the correct model for your flashing needs. These instructions apply to both Ondura sheet and tile installations.

The Small Pipeflashing Accessory
(12" x 12" Flat Center)

The small pipe accessory can be used for cold pipes up to 10 inches in outside diameter or for hot pipes with a maximum of 6 inches in outside diameter. To install, line up the corrugations of the accessory with those of the Ondura sheet so the pipe to be flashed will come through the center of the accessory. Cut a 15" x 15" square hole in the Ondura sheet so the accessory will nest well. Apply two beads of butyl caulk around the square hole before placing the accessory.

Cold Pipes -- Cut a hole in the center area of the accessory to fit the pipe. Insert the pipe. Slip en Ondura pipe flashing boot with rubber collar over the pipe, caulk the boot to the flashing accessory and then fasten it to the accessory with sheet metal screws.

Hot Pipes -- Cut a hole in the center area of the accessory that is 2 inches bigger all around than the hot pipe. Install the hot pipe manufacturer's boot with caulk and sheet metal screws. Then install the pipe manufacturer's storm collar per their instructions.

Finishing Up -- Cut a full-sized Ondura sheet to a seven-corrugation width. Cut an opening 20 inches deep from the bottom edge of the sheet and three corrugations wide. Fit the sheet over the flashing accessory so that it will cover the top and both side corrugations. This sheet should fit directly over the sheet to which the accessory is applied, be caulked to the accessory, and its upper end should be under the lap of the next higher row of Ondura sheets. Fasten with Ondura nails (see Fig. 26).