1. Flashing Archives - Hammer & Hand Better building through service, craft, & science. Thu, 31 Oct 2024 02:19:38 +0000 en-US hourly 1 https://wordpress.org/?v=6.8.1 https://mld8ztyau83w.i.optimole.com/w:32/h:32/q:mauto/f:best/https://hammerandhand.com/wp-content/uploads/2021/11/HH_LOGO_S_RGB_7475_f.png 1. Flashing Archives - Hammer & Hand 32 32 1.1 FLASHING https://hammerandhand.com/best-practices/1-1-flashing/ Sun, 01 Sep 2024 15:07:19 +0000 https://hammer-and-hand.local/?post_type=hh_best_practices&p=14956 “The fundamental principle of water management is to shed water by layering materials in such a way that water is directed downwards and outwards out of the building or away from the building. The key to this fundamental principle is drainage. The most elegant expression of this concept is flashing. Flashings are the most under-rated […]

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]]> “The fundamental principle of water management is to shed water by layering materials in such a way that water is directed downwards and outwards out of the building or away from the building. The key to this fundamental principle is drainage. The most elegant expression of this concept is flashing. Flashings are the most under-rated building enclosure component and arguably the most important.”

-Joe Lstiburek

A. FLASHING DIMENSIONS

B. FLASHING: WHERE TO INSTALL IT
Flashings should be installed:
1. At all horizontal joints between different exterior finishes unless the upper finish overlaps the lower finish.
2. At every offset in cladding, changes in cladding substrate, and at all penetrations (horizontal transitions between siding, stone, brick, tile, or stucco).
3. Where stresses can be concentrated (such as at the rim joist/foundation joint).
4. Where drainage is compromised (such as a change from wall cladding to parging).
5. The top and bottom of windows, doors, and all penetrations (vents, lights, hose bibs, electrical outlets, electrical meters, etc).

C. FLASHING: IMPORTANT POINTS
1. Building paper lapping: Install in a shingled fashion with the upper sheet always overlapping the lower sheet by a minimum of 4”. This and the down and out principle shown below.
2. NEVER rely on any self-adhering membranes (tape, peel and stick) in lieu of properly shingled laps or fluid applied flashing.
3. Minimum flashing slope: 20 degrees.
4. Leave a 1/4” minimum gap between cladding termination and sloped metal drip flashings, shown in figure 1.1 C (this detail can also apply to other flashing details such as: belly bands, exterior penetrations, etc.).
5. If above average shrinkage or differential movement is expected (wood to masonry transition or multi-story building) the minimum gap between flashing and the cladding should be increased to 1/2”.

D. Drip Edges
Flashing with a hemmed drip-edge breaks water surface tension and prevents water from running along the underside of the flashing and back into the wall.

 

Important Note: Flashing penetrations: Penetrations (pipes, cables, refrigerant lines, vents, etc.) must be flashed before the cladding is installed. It is nearly impossible to properly flash a penetration without removing the cladding around the penetration. Be sure to have a plan for all flashings through the building enclosure prior to cladding the building.

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]]> 1.2 HEAD FLASHING https://hammerandhand.com/best-practices/1-2-head-flashing/ Mon, 02 Sep 2024 21:56:15 +0000 https://hammer-and-hand.local/?post_type=hh_best_practices&p=14961 Head Flashing Specifications: About Head Flashing: In high exposure locations, head flashing should incorporate an end dam to prevent water from running off the end of the flashing. At this location the cladding may need to be cut to fit around the projection of the end dam.                 […]

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]]> Head Flashing Specifications:

About Head Flashing:
In high exposure locations, head flashing should incorporate an end dam to prevent water from running off the end of the flashing. At this location the cladding may need to be cut to fit around the projection of the end dam.

 

 

 

 

 

 

 

 

  • Clip flashing back to window casing at bends to create flaps for bending.
  • Trim hemmed edge so it ends at the edge of the window casing and does not extend with the other tabs.

 

  • Fold front tab back against side of casing.

(Arrow) Back leg of flashing should extend past head casing.

  • Fold down the horizontal part of flashing over the side of the window casing.
  • Solder head flashing at the ends to make watertight.
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