Georgia-Pacific Building Produts

Gypsum Products / Interior Products / ToughRock® Gypsum Board

Frequently Asked Questions

What happened to Georgia-Pacific's regular 1/2" gypsum board?

Georgia-Pacific has always made a quality 1/2" paper-faced gypsum board. In the first half of 2015, Georgia-Pacific Gypsum introduced an upgraded 1/2" paper-faced gypsum board called ToughRock® Fireguard 45™ Gypsum Board. The improved 1/2” board has enhanced fire-resistive properties and can replace standard and lightweight gypsum board in ALL 1/2" wall and ceiling assemblies, including 24" o.c. ceilings. Patent-pending ToughRock® Fireguard 45™ Gypsum Board is the only available standard weight 1/2" interior wallboard that has achieved a 45-minute UL classified fire rating in select assemblies (consult local codes for actual requirements). For additional information concerning fire ratings and fire safety, go to

Research used to shape the innovation process considered consumer concerns about home fire safety. Learn more>>

How often is a control joint required?

According to the Gypsum Association publication GA-216, gypsum board could be applied in a ceiling framed 24" o.c. provided the board length is at right angles to the framing members. When a water-based texture is to be applied, the maximum spacing for traditional 1/2" gypsum board is 16" o.c. The excessive amount of water in the texture could cause the board to sag.

We always advise our customers to use either 5/8" board, ToughRock® CD® ceiling board, or 1/2" ToughRock Light & Strong in such applications. Once the board sags, it is much more expensive to replace than to use the right product initially. Sag in the ceilings of new homes is a common complaint. Most often, research reveals it is not the board but job site conditions that cause the board to sag. Propane heaters combined with poor ventilation cause build-up of moisture in the house. A non-insulated (poly sheet) vapor barrier in the plenum also could cause the board to sag. The water in the texture evaporates through the board and into the plenum. If the vapor barrier has not been installed prior to texture painting, the water vapor condenses against this surface and drips back onto the board.

What should we do if the gypsum board gets wet?

According to the Gypsum Association publication GA-231, gypsum board should not be allowed to get wet; it should be covered if stored outside. However, there are situations where the board could get wet in transportation/storage or installed in-place. If the board gets wet in an installed in-place situation, first remove the sources of moisture. Lay the board on a flat surface and allow it to dry out thoroughly. Once the board is dry, examine it for paper-to-core bond failure, mold and mildew growth, nail pops and sag (in the case of ceilings). Paper-to-core bond failure and board sag are irreversible damages and the board should be replaced. Mold can be cleaned using vinegar and water solution or alternates (use care when using bleach or chlorine solutions). For nail pops, place a fastener an inch above or below any popped-up nail.

Should gypsum board be installed vertically or horizontally?

While gypsum boards are stronger in one direction, they may be installed either vertically or horizontally on wood or steel studs. If the boards are to be used in a fire rated assembly then use the board orientation that is stated in your specific rated assembly.

How often is a control joint required?

The requirement for ceilings and walls is the same. A control joint should be installed every 30 feet when there is not perimeter relief. When there is perimeter relief, control joints can be installed every 50 feet.

Standard 1/4" 3/8" and 1/2" All ToughRock Categories

* For additional information concerning fire ratings, go to

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