Flashing at Sills Alexandria VA

Sill flashing in Alexandria controls water that penetrates through the masonry sill and helps control water penetrating the perimeter sealant joint around the windows. The sill flashing will prevent water from saturating the top of the masonry beneath the sill.

Outdoor Lighting Perspectives of Northern VA
(703) 366-3897
5765-F Burke Centre Pkwy #330
Burke, VA
 
Millwork Lighting by Virginia Metal Spinners
(540) 246-3884
1592 C F Pours Drive
Harrisonburg , VA
 
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(804) 302-4391
12730 Spectrim Ln
Midlothian, VA
 
The Downes Co
(703) 836-5566
203 S Union St
Alexandria, VA
 
Yucisin & Associates
(703) 971-5558
5924 Westridge Ct
Alexandria, VA
 
Outdoor Lighting Perspectives of Northern VA
(703) 366-3897
5765-F Burke Centre Pkwy #330
Burke, VA
 
Vernon Daniel Associates
(703) 631-5525
8805 Commerce Ct.
Manassas, VA
 
Definitive Concepts, Inc
(757) 463-9850
596 Central Drive
Virginia Beach, VA
 
High Performance Strategy Associates
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5813 Lane Dr
Alexandria, VA
 
Information Engineering Services
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1700 Diagonal Rd
Alexandria, VA
 

Flashing at Sills

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Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: July 1, 2000

Why do people install flashings beneath masonry sills? Are they required if a single-piece stone sill is used?

Sill flashing controls water that penetrates through the masonry sill and helps control water penetrating the perimeter sealant joint around the windows. The sill flashing will prevent water from saturating the top of the masonry beneath the sill. These flashings are especially important when using rowlock brick sills or other sills that have many joints. Multiple joints increase the risk of developing excessive water penetration into the masonry below.

In hot humid climates, sill flashings may also be helpful in preventing hot humid cavity air from condensing on the underside and perimeter of the window. In this case, the sill flashings should be integrated with a cavity seal at the window head and jambs.

When using a single-piece stone or precast concrete at a window, the flashing is less important. Very little water will penetrate a single-piece stone or concrete sill. Flashings, however, are still useful in controlling water penetration at perimeter sealant joints or preventing hot humid cavity air from reaching the perimeter of the window. Where flashing is not used, the stone or precast concrete sill should project beyond the face of the masonry and contain a drip. This will prevent water penetration at the joint beneath the sill. This joint will often crack due to differential m...

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