AMN Construction
805 886 0988Contact
AMN Construction · Trade secrets · Windows and exterior

Trade 05 of 13

Windows and doors, where water tries to get in.

Openings are where water enters a house. A window is only as good as the flashing around it.

In short

  • Flashing is applied like shingles: lower pieces first, upper pieces lapped over them.
  • Windows and large doors often have long lead times. Order them early.
  • Once stucco or siding covers the wall, the flashing is hidden forever.
Drawing: Windows, doors and weatherproofing123456
  1. Stucco or sidingThe outer skin. It sheds most water but is not the waterproofing.
  2. Weather barrierThe real waterproof layer. It laps shingle-style, bottom to top.
  3. Sill panA sloped tray under the window that sends any leak back outside.
  4. Sealant jointFlexible sealant over backer rod, sized to move with the house.
  5. WindowSet in the opening and flanged to the weather barrier with tape.
  6. Drywall returnThe inside finish around the window, done last.
A vertical section at a window sill: stucco, weather barrier, sheathing and stud, with a sloped sill pan and sealed flange beneath the window.

What you will see

In the order it happens.

  • NoiseMedium
  • MessMedium
  • Your sayHigh
  1. Step 1

    Windows and doors are set in their openings and flashing tape is applied around them.

  2. Step 2

    A weather barrier covers the sheathing, lapped from the bottom up.

  3. Step 3

    Stucco is built up in coats with curing time between, and siding goes on in rows.

  4. Step 4

    Scaffolding surrounds the house for a while, and the exterior colors appear last.

How it is done well

The techniques that matter.

  • A sloped sill pan under every window sends any water that gets in back outside.
  • Each layer overlaps the one below at the bottom, sides and top.
  • Stucco has a drain edge (weep screed) at the bottom and joints that limit cracking.
  • Caulk joints get a foam backer and room to flex.

The hardest parts

Where this trade earns its fee.

  • Large sliding or lift-and-slide doors that must stay waterproof at the threshold.
  • Coastal salt air, which punishes cheap hardware and finishes.
  • Custom window sizes with long lead times that hold up stucco and drywall if ordered late.

Think deeply here

Decide this before the trade starts.

These are the choices that decide whether the finished house matches the one in your head. Changing them later costs time and money.

  • Window material, color and style, since lead times drive the schedule.
  • Which windows open and how. Bedrooms need one big enough to escape through.
  • Glass: privacy, tint, safety glass near doors and energy performance.
  • Door thresholds, especially where indoor floors meet outdoor patios.

Ask any builder

  • Can I see the flashing at one window before the wall is covered?
  • What is the window lead time, and what does it hold up?
  • How does the door threshold stay waterproof?
Before thisRoofingNext on sitePlumbing

All the trades, in the order you will meet them

  1. 01Site work
  2. 02Foundations
  3. 03Framing
  4. 04Roofing
  5. 05Windows and exterior
  6. 06Plumbing
  7. 07Electrical
  8. 08HVAC
  9. 09Insulation
  10. 10Drywall and plaster
  11. 11Tile
  12. 12Cabinetry
  13. 13Floors and paint

General guidance, not a specification. Your drawings, your engineer and your building inspector govern every job. See the whole process · Trade secrets home

Inquiries

Want this explained on your own house?

Email the address. A written reading of the parcel is free, in two business days.

Email Matt the addressOr call Matt · 805 886 0988
  1. Same dayMatt confirms he has it, and flags anything obvious that is missing.
  2. Within two business daysA written reading of your parcel: jurisdiction, review bodies, constraints, an order of cost and the permit path.
  3. Then nothing, unless you askNo follow-up sequence, no call from anyone else. The assessment is yours to keep, and to take anywhere.

Updated October 2026

Email Matt