Flashing at Sills Riverhead NY

Sill flashing in Riverhead 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

J M Consulting Inc
(631) 591-1632
1394 Roanoke Ave
Riverhead, NY
Risk Management Publshng
(212) 286-9364
655 3rd Ave
New York, NY
C L Multiservices
(718) 684-2693
912 Soundview Ave
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Hoburn Management Corp
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Management Advisory Group
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F B C Community Services Inc
(631) 727-0592
57 Bell Ave
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Greenberg Zoldan Inc
(212) 931-6030
330 W 38th St Rm 801
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Austrian Trade & Consulting Group Inc
(212) 681-7974
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Non Profit Administrative Service
(518) 348-1398
4 Chelsea Pl
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Duggan Janet & Assoc Inc
(914) 238-3674
121 King St
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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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