Flashing at Sills Ithaca NY

Sill flashing in Ithaca 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

South Hill Business Campus Llc
(607) 256-2025
950 Danby Rd
Ithaca, NY
Tfc Associates
(607) 277-3401
PO Box 321
Ithaca, NY
First Niagra Risk Management
(607) 256-8967
501 S Meadow St
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First Pro Group Inc
(718) 526-0635
8900 170th St
Jamaica, NY
Kern Telemanagement
(516) 576-8831
910 S Oyster Bay Rd
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Thomas Management Services Llc
(607) 277-1690
215 E State St
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Mitegen Llc
(607) 266-8877
95 Brown Rd
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Clarity Consulting Inc
(607) 272-1830
409 College Ave
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Sks Business Center Inc
(718) 429-8315
3711 74th St
Jackson Heights, NY
Orange County Economic Development Corp
(845) 294-2323
40 Matthews St
Goshen, 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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