Flashing at Sills Mastic NY

Sill flashing in Mastic 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

Forest Manor Management Corp
(718) 448-8964
415 Manor Rd
Staten Island, NY
Executive Coaching Group Inc
(212) 877-3400
132 W 78th St
New York, NY
Kahn William M CPA
(518) 449-3166
66 State St
Albany, NY
Premiere Consulting Services
(315) 454-4903
5858 E Molloy Rd
Syracuse, NY
Caj Incorporated
(516) 486-7755
463 Jerusalem Ave
Uniondale, NY
Image Development Co
(518) 373-2121
100 Sitterly Rd
Clifton Park, NY
It Management Partners
(914) 682-2178
50 Main St
White Plains, NY
Promotional Insights Inc
(631) 423-4726
746 New York Ave
Huntington, NY
Kim Cole Consulting
(516) 385-3226
425 Northern Blvd
Great Neck, NY
Glendon Press
(212) 308-6648
509 Madison Ave
New York, NY

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...

Click here to read full article from Masonry Construction

Related Articles
- Flashing Factors Mastic NY
Rowlock brick sills contain many joints and are particularly susceptible to water penetration. For this reason, I do not recommend their use in freeze-thaw environments.
- Eco-Friendly Products Mastic NY
- Home Exterior Products Mastic NY
- High-Efficiency Products Mastic NY
- Inner Corner at Base of Wall Mastic NY
- Home Siding Tips Mastic NY
- Flashing and Sill Products Mastic NY
- Flashing in Siding Installations Mastic NY