Flashing at Sills Lancaster NY

Sill flashing in Lancaster 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

APF 32 LTD.
716 836-7190
278 Faraday Rd
Tonawanda, NY
Kanick and Co
(716) 651-0111

Lancaster, NY
179 Ashburton Inc
(914) 740-4626
28 Coventry Ln
New Rochelle, NY
Cai Corporate Affairs International
(518) 562-2240
43 Durkee St
Plattsburgh, NY
Preemptive Process Services Inc
(718) 341-9960
17637 120th Ave
Jamaica, NY
Be-Bright Lighting, Inc.
(716) 907-3763
P.O. Box 458
East Amherst, NY
Preciosa International, Inc.
(716) 626-9759
2316 Wehrle Dr.
Williamsville, NY
Promotional Images Inc
(716) 685-4433
4422 Walden Ave
Lancaster, NY
Strauss Barry M Associates
(212) 779-4135
307 5th Ave
New York, NY
Ableman Management Services
(212) 399-2700
250 W 57th St Ste 429
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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