Flashing at Sills Jacksonville FL

Sill flashing in Jacksonville 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.

American Electrical Contracting, Inc.
(904) 737-7770
5065 Saint Augustine Road
Jacksonville, FL
 
Darrell's Electric
(904) 282-0409
4237 County Road 218 W
Middleburg, FL
 
C And R Electrical Services
(904) 291-9436
5368 Muscovy Rd
Middleburg, FL
 
G & G LLC Electrical
(904) 406-2005
2935 Reindeer Ct
Middleburg, FL
 
Black Creek Electrical Services Inc
(904) 406-8059
4230 Cr Rd 218 Ste #8
Middleburg, FL
 
House of Lamps & Shades
(904) 565-9800
11690 Beach Blvd.
Jacksonville, FL
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Magical Illuminations Inc
(904) 298-3795
7211 Cottonwood Ct
Middleburg, FL
 
Black Creek Electrical
(904) 291-7941
4230 County Road 218 Ste 8
Middleburg, FL
 
Tomar Electronics
(904) 215-0094
1928 Captiva Dr
Middleburg, FL
 
Aqua Scape Irrigation
(904) 282-2275
383 Brierstone Ct
Middleburg, FL
 

Flashing at Sills

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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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