How to play
- Drag a part from the pegboard onto the wall. Each part lands over whatever went on before it.
- Tap the sealant bead on the board to switch it between 3 sides (head and jambs) and 4 sides.
- Tap a part on the wall to peel it off. You can't peel a part while another lap lies over it.
- Press Hose test. A dry wall means every lap sheds water; a wet spot and a message name the lap that's wrong.
- Stuck? Hint points to the first part that went on out of order. Watch it built shows the full sequence.
What the puzzle teaches
- Flashing works by shingle lapping: each upper layer overlaps the layer below it, so gravity carries water outward over every joint.
- On a wall that's already wrapped, the sequence is sill flashing first, then the window, then the jamb flashings, then the head flashing, then the wrap's head flap laid down over the head flashing.
- Sill flashing goes on before the window so anything that gets past the window frame lands on it and drains out.
- Jamb flashing laps over the sill flashing and runs past its bottom edge; it must never be tucked under it.
- Head flashing runs past the outer edges of both jamb flashings and goes under the wrap's head flap, which is then laid down and its diagonal cuts taped.
- Sealant goes behind the head and jamb fins. Leave the sill fin unsealed (or the bead discontinuous) so water that reaches the sill can drain to the outside.
Parts on the list
- Flexible sill flashing (sill length plus 12 inches, so it turns 6 inches up each jamb)
- Flashing tape for both jambs and the head
- Sealant for the head and jamb fins
- Wrap tape for the head flap's diagonal cuts
- Cap fasteners for the fanned sill corners
- Flanged window and fasteners per the window maker
This puzzle teaches lap order for a flanged window in a wall that's already wrapped. Follow the window maker's and the wrap maker's instructions and your local code.