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Flashing at Sills Kendal

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 Kendal.

G R T Builders
01539 723577
56 Lound Rd
Kendal
 
Russell Construction (kendal)
01539 722629
Dockray Hall
Kendal
 
G F Martindale
01539 720197
Entry Lane
Kendal
 
Leck Construction
01539 723639
Mill Mews
Kendal
 
Bowland Stone
01539 723600
Dockray Hall Mill
Kendal
 
D C Reid & Partners
01539 729494
Charnin House
Kendal
 
B G L Groundworks
01539 721803
22 Archers Meadow
Kendal
 
David Nevison
01539 721380
P O Box 161
Kendal
 
R Gibson
01539 727066
31 Bleaswood Rd
Kendal
 
D O Sullivan And Sons
01539 729031
16 Castle Garth
Kendal
 

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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