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Problem with flashing details at inside and outside corners (3 inch foam)

Tim Brown | Posted in General Questions on

I’ve stripped my exterior walls to the plywood and am about to install the metal flashing at the bottom of the wall… with 3 inches of foam and 3/4 inch furring strips and a Hardieboard type horizontal lap siding to be added the projection of the flashing is enormous.. at 4″1/4 inches plus a 1″ drip edge lip.
Problem is at inside and outside corners: I can’t figure out how to miter these complex curves into a continuous flashing. Is there a video here or on youtube that gives some insight?
I’ll post a picture shortly to illustrate… thanks

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Replies

  1. Expert Member
    Malcolm Taylor | | #1

    Tim,

    I'll try and walk you through a simple method with these sketches.

    Starting with the outside corner.
    - Cut the flashing as shown in the top-right sketch and bend down the end slightly along the 45 degree dotted line.
    -Cut the opposing piece of flashing at 45 degrees from the corner as shown in the bottom right sketch. Install in a bed of caulking on the first piece you cut.

    Inside Corner
    - Cut the flashing as shown on the top left sketch, and bend up slightly along the 45 degree dotted line.
    - Cut the opposing piece of flashing at 45 degrees from the corner as shown in the bottom left sketch. Install on a bed of caulking on the first piece you cut.

    Because of the length of the overlaps you may want to secure them together with a short metal screw.

  2. Expert Member
    Malcolm Taylor | | #2

    Tim,

    Another approach is to use U-shaped perforated flashing to cover the whole thing.

  3. Tim Brown | | #3

    Thanks for the insight..I'll give it a shot..

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