Masonry Magazine December 2015 Page. 25
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These joints provide two features essential to the shedding
MASONRY CLEANING SYSTEMS
ofwater: a sloping profile and densified outer surface.
Raked joints are to be avoided for chimney constructions (as well as all other weather-exposed masonry), since they provide ledges for the accumulation ofwater and an outer surface that is usually coarse and non-densified. Head joints should also be avoided because they are often not filled completely to the full-bed depth of the brick. They are the most common source of leakage in brick masonry.
Roof-to-chimney flashing
FLASHING FROM THE ROOF to the chimney is necessary to prevent water from leaking into the roof area where the chimney penetrates the roof. The "flashing" is normally in�serted in two parts -step flashing, which is inserted under the roof shingles (or other roofing materials), and stepped
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turns down over the step flashing. The vertical legs of the � Lower priced, smaller package
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flashing and counterflashing should be caulked with a con�
� Better cleaning
struction sealant to prevent wind-driven rains from blowing
� Premium materials, such as a
into these areas.
i-il"I~~ ~---stainless steel frame
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When the dimension ofthe chimney parallel with the roof�_, ' ,""' line ( usually regarded as the chimney width) exceeds 30 inches, Visit us at www.Kem-O-Kleen.com a cricket is usually required. Use ofa cricket for chimneys is or call toll-free 800.274.4121 effective in aiding roof drainage from behind wide chimneys,
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