It is typically perpendicular to the eave.
Roof rake edge detail.
When this occurs the water may run back under the edge of the shingles often wetting the roof deck.
In all cases it is important to properly detail and install the edge conditions.
Repairing your roof repairing your roof.
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Learn about perimeter edge metal.
Always try to carry membrane felts over or up and over and down to ensure the roof membrane will always drain free and clear of any adjacent system.
This is done to seal the edges of the roof and to protect the roof s components from wind driven rain.
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When water runs down the roof it pauses a moment before pouring off.
One by 2 inch rake boards often cover the exposed top edge of the siding when there also is an eave overhang on the gable end.
The rake edge should be installed at the rakes above the underlay of the roof.
Repairing your roof.
Roof rake boards are installed in different widths based on the surface being covered.
When replacing shingles on a roof or constructing a new roof it is important to give proper consideration to flashing details on the drip and rake edges.
Use larger rake boards such as 1 by 4 inch and 1 by 6 inch when there isn t an eave overhang on the gable end.