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Flashing at Sills Lancaster

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. Read on to learn more about flashing information in Lancaster.

Gary J Gray
01524 421332
18 Brampton Drive
Lancaster
 
All Seasons Paving
0800 7814138
280 Marine Road
Morecambe
 
J R Moss Ltd
01524 771160
24 Sycamore Road
Lancaster
 
Andy Pardula
01524 720803
158 Lancaster Rd
Carnforth
 
A J Hayton Welding & Fabrication
01524 222242
Bainsbeck Gararge
Carnforth
 
Drivecraft
01524 848949
Unit 2 Northgate
Morecambe
 
T L & G Malin & Sons Ltd
01524 823206
Sandside
Carnforth
 
T. Cowperthwaite
01524 732367
11 Briailea Road
Carnforth
 
A J R Construction Ltd
01524 782028
19 Silverdale Rd
Carnforth
 
Metcalfe Brothers
01524 730256
Unit 1
Carnforth
 

Flashing at Sills

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.

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