Dark Gypsum Hickory NC

The construction is 4-in. brick masonry walls with 4-in. concrete masonry backup. The interior has light gauge steel hat channels attached to the concrete masonry with rigid insulation between the channels.

Neil Dellinger Masonry INC
(828) 312-2998
5845 W Nc 10 Hwy
Hickory, NC
Services
Masonry, Masonry Service, Masonry Repair, Concrete Construction, Masonry Contractor

Preferred Carpet One
(704) 271-1397
5001 South Boulevard, Suite E
Charlotte, NC
Services
Product only, or product plus installation. Hardwood floors: All species and types, solid and engineered, unfinished and prefinished laminate floors, cork floors and bamboo floors; hardwood sanding and refinishing. Other flooring: Marmoleum, sheet vinyl, luxury vinyl V.C.T., rubber floors, cove base. Carpet: All carpet types for residential and commercial; custom area rugs, stair runners and outdoor carpets. Stone: Travertine, slate and exotic stone, granite floors, ceramic, porcelain, glass til
Membership Organizations
Homeowner Approved, Allen Tate Concierge Services.

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Southeastern Concrete
(910) 764-0100
1001 S Reilly Rd Ste 261
Fayetteville, NC
 
Louis Concrete & Steel Inc
(336) 841-5246
1601 Woodside Ave
High Point, NC
 
Custom Works Of Fayetteville
(910) 485-3770
8140 Cliffdale Rd
Fayetteville, NC
 
D & D's Flooring & Interiors
(704) 684-4887
628 West Morehead Street
Charlotte, NC
Services
Formerly The Plywood Mart, Inc.; Mohawk® carpet, hardwood, laminate, resilient and tile flooring; Shaw® carpet, hardwood, laminate, resilient and tile flooring; Armstrong® hardwood, laminate and resilient flooring; Bruce® hardwood flooring; custom site finished hardwood floors (custom colors and designs available); Daltile® tile and stone; Crossville® tile and stone; Florida® tile and stone; Marazzi USA® tile and stone; Andersen® windows and doors; Marvin® windows and doors; Santa Cruz®
Membership Organizations
Homeowner Approved, National Wood Flooring Association Member.

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Masonry At
(919) 957-7879
411 E End Ave
Durham, NC
 
Buckner'S Masonry & Construction
(336) 906-2431
5815 Samet Dr Ste 103
High Point, NC
 
Vandergriff Masonry
(919) 906-0741
11457 Claybank Place
Raleigh, NC
Services
Brick, Stone, Concrete, Repairs, Retaining Wall, Step, Patio, Walk, Fireplace, Column, Point up, Masonry Cleaning, Sealing, Chimney, Lattice, Fence, Stairs, Foundation, Veneer, Repair
Hours
Day time hours Monday - Friday

Hester'S Masonry
(919) 956-7936
2416 Lindmont Ave
Durham, NC
 
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Dark Gypsum

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Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: November 1, 2008

By Norbert V. Krogstad

What causes the dark vertical lines that occur on gypsum wallboard installed directly over the furring strips in brick veneer/concrete masonry walls?

The construction is 4-in. brick masonry walls with 4-in. concrete masonry backup. The interior has light gauge steel hat channels attached to the concrete masonry with rigid insulation between the channels. There is a vapor barrier over the insulation and hat channels. The gypsum wallboard is anchored to the hat channels on the interior face of the vapor barrier.

We were originally thinking that the problem was associated with leakage through the masonry. However, the building has large overhangs and during most rains the water doesn't even get to the brick masonry. Also, the vapor barrier would stop any moisture that did get in the masonry from reaching the interior wall board anyway.

How can this problem be avoided?

The darkening of the gypsum wallboard over the hat channels is sometimes referred to as “ghosting.” This phenomenon is typically caused by condensation from interior air during cold weather.

Because the insulation was placed on the interior side of the concrete masonry, both the concrete masonry and brick masonry are cold. The hat channels interrupt the insulation and are in direct contact with the cold masonry walls.

Click here to read full article from Masonry Construction