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Flashing at Sills Ambleside

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 Ambleside.

Michael J Withers
01539 434203
Briardale
Ambleside
 
A W Bowness Ltd
01539 433375
Colwith Orchard
Ambleside
 
Black & Haddow
01539 432755
47 Greenbank Road
Ambleside
 
J M Kellett
01539 436485
Red Lion Yard
Ambleside
 
Graham Coward
01539 445415
Hillside
Windermere
 
S M Dixon
01539 434537
40 Fisherbeck Park
Ambleside
 
C P Lishman Ltd
01539 433681
29 Kingfield
Ambleside
 
Cook & Lakin
01539 433209
4 Kelsick Road
Ambleside
 
Cumbria Solutions
01539 446662
Unit 4
Windermere
 
Mitchinsons
01539 445274
The Workshop
Windermere
 

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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