Full Product Manual

Construction Guide | 19

Wall Protector/Heat Shield

1/2” PermaBASE and 1/2” PermaBASE PLUS are listed by

Underwriters Laboratories, Inc., for use with UL-listed solid-fuel

room heaters and replace stoves. Used as a wall protector/

heat shield, PermaBASE Cement Board reduces by 40% the

manufacturer-specied clearance (minimum 12" [305 mm])

between the room heater or stove and a combustible wall

surface.

Installation: Furring is made by cutting a full PermaBASE

panel into 4" (102 mm) wide strips with a carbide-tipped saw

or utility knife. Attach a double layer of furring strips to the wall

studs using cement board screws, which provide a minimum

penetration of 3/4” (19.1 mm) into the framing.

When installing panels, leave a 3" (76.2 mm) gap at the ceiling

and 1” (25.4 mm) to 2” (50.8 mm) gap at the oor. This air space is

required for the proper functioning of the heat shield. Do not close

or block these openings.

Heat shield panels may be cut to required size using a standard

utility knife or power saw. Fasten the PermaBASE panels to the

studs with galvanized roong nails or cement board screws

spaced 8” (203 mm) o.c. Cement board screws must be long

enough to penetrate into framing a minimum of 3/4” (19.1 mm).

Do not install any nails or screws into the wall area directly

behind the proposed location of the appliance.

Finishing: Prell joints with dry-set mortar, then immediately

embed PermaBASE™ Cement Board Tape and level joints. As an

alternative, apply PermaBASE Tape over the joints, then apply

dry-set mortar, forcing it through the tape to completely ll and

level the joints. All non-combustible nishes, such as ceramic tile,

thin brick or stone, can be applied over wall-shield.

Do not apply combustible nishes, such as wallpaper,

to cement board surface.

Note: Do not put screws

in projected appliance

area of the heat shield.

1. Studs Spaced 16” o.c.

2. Existing Gypsum Board

3. Two Layers 4" Wide Furring Strips

4. PermaBASE Heat Shield

5. Joint Treatment

6. Fasteners Spaced 8” o.c. Maximum

7. 1/2" Minimum Clearance

from the Floor

PermaBASE Cement Board heat shielding

permits clearance reduction up to 40% of

the manufacturer’s suggested clearance.