Flashing at Sills Hollis NY

Sill flashing in Hollis 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

Calger Lighting Incorporated
(212) 689-9511
200 Lexington Ave
New York, NY
Lendy Electric Equipment & Supply Corporation
(212) 941-1334
176 Grand St
New York, NY
Argo International
(212) 431-1700
140 Franklin Street
New York, NY
Illuminetrix, Inc
516-798-1309
87 Pennsylvania Avenue
Massapequa, 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
City Knickerbocker
(212) 586-3940
665 11 Av W 48th St
New York, NY
Levy Lighting Inc
(212) 925-4640
347 W 36th St
New York, NY
Himalayan Lights
(212) 877-2159
200 W. 86th Street
New York, NY
Illuminations
516-766-4880
251 Sunrise Highway
Rockville Centre, 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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