Dark Gypsum Asheville 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.

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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Williams Masonry & Concrete, Inc.
(910) 470-6777
1404 Corbett St.
Wilmington, NC
 
Sticks & Stones Of Nc Inc
(919) 870-6904
4007 Hickory Grove Rd
Durham, NC
 
Byrd & Goff Construction Co
(919) 854-0800
202 Travis Park
Cary, NC
 
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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Pinnacle Masonry Inc
(919) 469-4522
101 Brady Ct Ste A
Cary, NC
 
Southeastern Concrete
(910) 764-0100
1001 S Reilly Rd Ste 261
Fayetteville, NC
 
Bobby Staley Masonry and General Construction
336-292-4236 or 336-508-0076
500 Meadowood st
Greensboro, NC
Services
Stone, brick, block, fireplace, foundations, repairs, and building new homes
Hours
any
Prices and/or Promotions
price vaires based on job needed, free estimates

Ash Busters Chimney Service
(336) 887-0839
2311 Purdy Ave
High Point, 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