Flashing at Sills Sunnyside NY

Sill flashing in Sunnyside 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

East Coast Lighting Incorporated
(212) 643-9727
353 W 39th St
New York, NY
Levy Lighting Inc
(212) 925-4640
347 W 36th St
New York, NY
Argo International
(212) 431-1700
140 Franklin Street
New York, NY
SGF Associates, Inc.
(212) 206-7610
119 W. 23rd Street
New York, NY
WAC Lighting
1.800.526.2588
615 South Street
Garden City, NY
Arc Lighting Design
(212) 465-1838
20 W 36th St
New York, NY
Emporium Antique Shop Limited
(212) 724-9521
20 W 64th St
New York, NY
New York Affordable Reliable Electricity Alliance
(212) 683-1203
347 Fifth Avenue
New York, NY
Rand Lighting Corp.
(212) 685-0925
303 Fifth Avenue
New York, NY
Saturn Lighting Inc
(212) 260-2444
370 2nd Ave
New York, 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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