INSTALLERS PLEASE READ THIS
HIP (LEFT & RIGHT) AND VALLEY (LEFT & RIGHT)
RETROSEAL CORRO SHADOWLINE is a single piece flashing that fits under the edge of new or existing roll top ridge capping. It has an inverted profile that sits in the shadow of the ridgecap. It may also be used for roof edge seal.
ADDRESSING SHRINK AND CREEP OF ROOF SHEETING
The major problem with using profile cut flashings is shrink or creep of the roof sheets. This may be due to deliberate shrinking or expanding of the sheets, or sheets being pulled apart or pushed together at the joint to run plumb with the building. It can also be caused by sheet and roll-mill variations.
Retroseal Corro Shadowline addresses these problems in several ways. The flashing is made in sheet widths, to accord with sheet adjustment at lap. However, it is slightly longer to allow for overlapping. The tabs have a unique shape and length, and are set at such an angle from the main body of the flash that they can create pressure where they meet the sheet Profiles. Where the sheet is in shrink (the profile on the sheet is deeper) it flexes down into the relaxed position. On creep (the profile on the sheet is shallower), it flexes up to the pressured position.
FITTING AND FIXING
For Existing Ridge. Back off ridge cap screws, slide the flashing under the edge and re-tension. Rescrew through flashing if it obstructs existing holes.
For New Ridge. Install ridge cap in the usual way, and fasten with minimal screws to hold in position. Then progressively slide the flashing up and under the ridge cap edge, removing tacking screws as necessary, and then screw all profiles through flashing at recommended intervals. If battens are remote to flashing, additional 10/16 teks with neo will give securement.
For Edge Seal. Install on first batten above fascia. Slide under each sheet and screw through sheet and flashing.
HIP AND VALLEY. The profile shape differs. Hip and Valley profiles have a wave shape (a long and short slope that varies with pitch) unlike common or straight Ridge Seal. If the flash doesn’t fit snugly, you have it on the wrong side.
THERE ARE MARKED REFERENCE SAMPLES ON TOP OF THE BOX. KEEP THEM AND USE THEM LAST.
Where a metal valley support tray with incorporated battens is used (varies between makers) a different configuration of valley flash may be required. In this case, see notes below.
BAL. For buildings that have to meet the Australian Standard BAL regulations, it is the Responsibility of the installer to be aware of these requirements, and to identify and close any gaps that exceed 3mm.
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