Flashing at Sills Sayville NY

Sill flashing in Sayville 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.

Local Companies

Balantzian Managmnt Corp
(845) 255-8570
238 Main St
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Wolosoff Bros
(718) 380-0100
13850 78th Ave
Flushing, NY
Wf Management
(718) 633-0628

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Lebarbour Assoc Inc
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Metro Stars Management In
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Center Management Associates
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Delta Capital Mgmt Inc
(212) 986-4040
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Redeker Management Consulting
(518) 798-0080
23 Honey Hollow Rd
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Stockholder Consulting Services Inc
(718) 984-0900
20 Edgewood Rd
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Hempstead Town of
(516) 489-5000

Hempstead, NY

Provided By:

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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