Regular Gypsum Board

For use on interior walls and ceilings. 

Also known as gypsum board, or drywall, 

ProRoc ® Regular is a durable, lightweight, 

cost-effective building material produced for 

interior walls and ceilings. 

Consisting of a premium quality, non-combustible 

gypsum core, ProRoc ® Regular gypsum board is 

encased in a smooth face (front) and back 

covering of 100% recycled paper. The tapered 

edges are precision manufactured and paper 

bound to promote easy joint finishing, making 

ProRoc ® Regular the ideal choice for finishing 

interior walls and ceilings. Once primed, it can 

be painted, wallpapered, or textured for the 

desired look. 

NATURAL FIRE RESISTANCE 

Because gypsum is inherently fire resistant and 

non-combustible, ProRoc ® Regular gypsum 

board provides a margin of fire protection to 

any building system. 

Gypsum contains chemically combined water, 

which when exposed to heat is slowly released, 

as steam, in a process known as calcination. 

This process allows the gypsum to act as an 

effective thermal barrier. 

ProRoc ® Regular gypsum board is packaged face 

to face in bundles of two sheets, to protect the 

face to be decorated. 

Distributed by: 

CertainTeed 

Regular Gypsum Board 

For further information regarding specified handling, 

storage and application methods, consult the 

relevant CSA and ASTM application standards and 

Gypsum Association (GA) literature. The Gypsum 

Board Systems Manual contains construction 

details, fire resistance ratings and sound 

transmission classification (STC) ratings for the 

full range of building systems. The Gypsum Board 

Systems Manual and MSDS information are 

available on our web site, www.certainteed.com. 

PRODUCT DATA 

Data Sheet 

THICKNESS 

6.4mm (1/4") ProRoc ® Regular 



LENGTH 

Contact the nearest Sales Office for stocked 

lengths available. 

WIDTH 

1220mm (4') 

WEIGHT (APPROX.) 

6.4mm (1/4") – 5.5 kg/m2 (1.13 lb/ft2 ) 

9.5mm (3/8") – 6.1 kg/m2 (1.25 lb/ft2 ) 

12.7mm (1/2") – 7.8 kg/m2 (1.60 lb/ft2 ) 

CORE 

Gypsum (noncombustible) 

EDGE 

Tapered, paper bound – factory finished 

END 

Square – factory cut 

PRODUCT STANDARDS 

• CAN/CSA-A82.27 Gypsum Board 

• ASTM C 1396 Gypsum Board 

• ASTM C 36 Gypsum Wallboard 

SURFACE BURNING CHARACTERISTICS 

• Flame Spread Rating 15 

• Smoke Developed Classification 0 

Flame Spread Rating and Smoke Developed 

Classification tested in conformance with 

CAN/ULC-S102 / ASTM E 84 

APPLICATION STANDARDS 

• CAN/CSA-A82.31 Gypsum Board Application 

• ASTM C 840 Application and Finishing of 

Gypsum Board 

• GA-216 Application and Finishing of Gypsum Board 

• National Building Code of Canada (NBCC) 

FINISHING STANDARDS 

• GA-214 Levels of Gypsum Board Finish 

LIMITATIONS 

• Not recommended for use where greater than 

normal moisture resistance is required. 

• Maximum framing spacing as per the National 

Building Code of Canada (NBCC), 

recommended application standards. 

• Not recommended for exterior application. 

• Not recommended for continuous exposure to 

temperatures exceeding 52°C (125°F). 

• All materials should be kept dry. 

• All materials should be stored indoors. 

• All materials should be neatly stacked flat on a 

level platform. 

Characteristics, properties or performance of materials or systems manufactured by CertainTeed herein described are derived from data obtained under controlled test conditions. CertainTeed makes no warranties, 

express or implied, as to their characteristics, properties or performance under any variations from such conditions in actual construction. CertainTeed assumes no responsibility for the effects of structural movement. 

® CertainTeed and the tag line “Quality made certain. Satisfaction guaranteed.” are trademarks of CertainTeed Corporation. All other trademarks are the property of BPB plc or its affiliates and related companies. 

NOTICE: The information in this document is subject to change without notice. CertainTeed assumes no responsibility for any errors that may inadvertently appear in this document. 

©01/07 CertainTeed Corporation. Printed in Canada on recycled paper. C March 2007 Form #: L–DS–001–B 

CertainTeed Corporation 

P.O. Box 860 

Valley Forge, PA 19482 

Professional: 800-233-8990 

Consumer: 800-782-8777 

www.certainteed.com

CERTAINTEED PROROC ® 

A durable, lightweight, cost-effective building material 

for interior walls and ceilings. 

Consisting of a premium quality, non-combustible 

gypsum core, ProRoc gypsum board is encased in a 

smooth face (front) and back covering of 100% recycled 

paper. The tapered edges are precision manufactured 

and paper bound for easy joint finishing, making 

ProRoc gypsum board the ideal choice for finishing 

interior walls and ceilings. Once primed, it can be painted, 

wallpapered or textured for a look that works for you. 

Planning the Job 

It’s best to plan your ProRoc installation with the least 

amount of joints (the seam where boards meet). 

Fewer joints will mean less finishing work. 

We recommend installing ProRoc boards perpendicular 

to studs or joists. ProRoc boards comes in 4-foot wide 

and various lengths and thicknesses. However, most 

common are 8”, 10”, 12”. You may find it easiest to 

work with 8-foot boards. 

8' 

12' 

12' 

20'– 0" 

8' 

8' 8' 8' 

24'– 0" 

Installation Instructions 

direction of 

studs or joints 

CUTTING THE BOARD CEILING 

Installing ceiling boards can be tricky and requires two 

people. In addition, you will find it much easier if you 

use T-braces or a drywall lift to hold the boards in 

place until they are fastened. 

ProRoc gypsum board is 

very easy to work with and 

cutting is quite simple. To 

make a cut, score the paper 

on the face side with a utility 

knife along the edge of 

your T-square. Apply firm, 

but even, pressure to snap 

the board along the score. Then fold the board along 

the score and cut the paper along the crease with the 

utility knife. Lastly, smooth the rough edges with a 

sanding block or drywall rasp. 

Remember, always wear safety glasses when cutting or 

sanding boards. 

ATTACHING PROROC BOARDS 

You can attach your 

ProRoc boards to studs or 

joists using nails, screws. 

We recommend using 

drywall screws for optimum 

installation and 

professional finish. You 

might wish to consult 

with your dealer when considering the different application 

methods. 

Always install ceiling first, then install walls, allowing 

a space of at least 1/2” off of the floor. Keep fasteners 

6-inches away from the interior ceiling and ensure that 

nails or screws are not less than 3/8” from the ends 

and edges of the boards. 

CertainTeed 

Gypsum Wallboard Panels 

Installation Guide 

TOOLS YOU WILL NEED 

To properly install ProRoc gypsum board, you’ll need 

the following tools: 

❏ Tape measure 

❏ 4-foot T-square or straight edge 

❏ Utility knife with extra blades 

❏ Step ladder 

❏ Marking pencil 

❏ Wallboard Saw 

❏ Tin snips 

❏ “Mud” Hawk or Pan 

If you are intending to finish your ceilings with a water 

based texture, you should use ProRoc 1/2” Interior 

Ceiling Board on maximum 24” on centre joists, in 

order to avoid sagging. 

To determine how many ProRoc boards you will need, 

simply calculate the total surface area of your walls 

and/or ceiling by multiplying the length by the width. 

You might wish to draw a sketch of the room/area you 

are working on to make things easier. When calculating, 

do not subtract windows or door areas. Divide 

your total square footage by the square footage of 

your boards (32-feet for an 8-foot board) and round 

You can build T-braces 

yourself! You’ll need a two 

by four that is an inch 

longer than the distance 

from the floor to the ceiling 

framing members, as 

well as, 2-two foot lengths 

of one by fours. 

One piece of the 1 x 4 should be used for the top of 

the “T”, while the second piece should be used as a 

brace and attached diagonally from the top piece to 

the stem. You’ll need to make sure the T stays square. 

Have your helper use one T-brace, while you manage 

the other to lift the board into place. Your drywall 

screws should be installed 12” to the joists. If using 

nails, they should be placed 6” apart. Install nails or 

screws slightly indented into the surface, without 

breaking the paper face or damaging the gypsum core. 

If you do break the paper, remove the fastener and 

replace with one 2” away. 

WALLS 

When installing gypsum board, install the upper board 

first, ensuring that you push the board firmly against the 

ceiling and that tapered edges are in contact. Then fasten 

with drywall screws spaced 16” apart (or preferably double 

nails 6” apart) working from the center out to the edges. 

To put the lower panel into place, you may wish to use 

a wedge or wallboard lifter. Put the angled edge under 

the board and use it as a lever to jack it up against the 

top panel. 

CUTOUTS 

You will need to cut openings in your ProRoc boards 

to accommodate electrical outlets, light fixtures, 

windows and doors. 

❏ 2-1/2”, 4”, 7” and 12” finishing knife 

❏ Drywall rasp 

❏ Dust mask 

❏ Safety glasses or goggles 

❏ 150-180 grit sandpaper 

❏ Sanding pad and pole sander 

❏ Sponge 

❏ Drywall hammer or regular carpenter’s hammer 

(if installing with drywall nails) 

❏ Electric screw gun or standard drill with dimpler 

attachment (if installing with drywall screws) 

up to find the number of boards you need. 

Based on the square footage of your project area, 

you’ll need the following materials per 100-square-feet: 

❏ 100 1-1/4” drywall screws (or 1/2 lb of nails) 

❏ 30-feet of CertainTeed Marco Joint Tape 

❏ 4.5L of ProRoc joint compound 

For light fixtures and 

electrical boxes, measure 

the distance from the 

edge of the adjacent board 

to the near and far sides 

of the installed fixture 

box. Then measure from 

the top edge of the panel 

to the top and bottom of the box. Trace the outline of 

the box in the position you just measured on the 

board. Cut the opening with a drywall saw. 

For larger openings, install the panels directly across the 

openings. Then use a drywall saw to cut the panels, using 

the framing as your guide. As you install the boards, 

make sure that you do not place joints at the edges of 

doors or windows. If you do, as the door or window is 

opened and closed over time, the joint will crack. 

INSIDE CORNER 

To join boards at an inside corner, simply butt the 

second board against the first and fasten its end to 

a framing member. 

OUTSIDE CORNER 

On outside corners, be sure to cover the end of the 

first installed board with that of the second. Fasten 

both ends of the boards to the common stud. 

To prepare the corner for 

finishing, install a corner 

bead. Measure the length 

needed, then cut the bead 

with tin snips, cutting 

through each flange 

towards the nose, then 

bending the bead to break. 

After selecting the corner bead of your choice, follow 

the manufacturer’s instructions for installation.

The finishing process requires patience! You should 

apply three coats of ProRoc joint compound through 

the process and allow 24-hours of drying time 

between applications. The first coat is used to embed 

the tape, while the two finishing coats feather out the 

compound, resulting in a uniform, smooth finished 

surface. 

Joint treatment and taping 

Begin with the butt joints – the areas where the 

unfinished ends of ProRoc boards meet. 

First, apply a coat of 

ProRoc joint compound 

over the joint with your 

four-inch knife. Then, 

press the tape firmly into 

the compound by pressing 

your knife over the 

tape. Squeeze out excess 

compound, making sure that there is enough ProRoc 

joint compound under tape to make a good bond. 

Allow each coat to dry thoroughly before applying the 

next coat (24-hours between coats). If the tape does 

lift along the edges after drying; simply cut out the 

affected area in the shape of a canoe before applying 

the next coat. If the tape lifts in the centre, you must 

tear out affected area and re-tape. 

Apply a second coat 

using a 7” taping knife 

and this coat should 

extend approximately 4” - 

6” beyond each side of 

the joint. After the coat 

dries approximately 

24 hours, sand the area 

Apply a third coat using a 

12” taping knife and this 

coat should be a thin coat 

and should extend 

approximately 7-12” 

beyond each side of the 

joint. The further you 

feather the compound 

out, the harder it will be to see imperfections. 

CertainTeed 

Gypsum Wallboard Panels 

A few pointers for easy and safe application: 

❏ Always wear a dust mask when sanding 

❏ Use only a 150 - 180 grit sandpaper, designed especially 

for joint compound 

❏ Keep your knife clean by drawing it over the edge 

of the mudpan or hawk. 

❏ Throw out any dried bits of ProRoc joint 

compound… they will leave scratches 

TAPING AND FINISHING OUTSIDE CORNERS 


P.O. Box 860 


When you are finished, you may want to test the finishing 

by holding your 12-inch finishing knife blade 

across the joint. If the blade rocks, you’ll know there is 

still a hump, which will need further feathering. 

SANDING 

Do not sand after applying tape, remove small lumps 

behind with your knife before applying 2nd coat. 

When sanding use 150-180 grit paper and always sand 

along the outside edge well, so that the transition 

between the compound and the ProRoc boards are 

smooth with no imperfections. Then sand the rest of 

the joint lightly in order to make smooth. Be careful 

not to sand too much off. If too much is sanded off, 

you will need to apply additional coats of compound. 

INSIDE CORNERS 

Inside corners will need to be taped as well. First, 

apply a thin layer of ProRoc joint compound on both 

sides of the corners using a 2-1/2” taping knife, 

extending the compound slightly beyond where the 

tape would extend. 

Next, fold the tape and 

lightly press it into the 

corner with your knife. 

Once it is in place, using 

your 2-1/2” knife or a 

corner tool to firmly 

embed the tape into the 

compound. Allow to dry for 24-hours, then apply a second 

coat using a 7” taping knife to one side of the corner. 

You can only do one side of the corner today, as 

the compound must dry completely so the other side 

can be finished tomorrow. Do the same for the third 

coat, using a 12” taping knife. 


Consumer: 800-782-8777 

www.certainteed.com 

Finishing Guide 

❏ Don’t worry about a smooth finish on the first 

coat… the finishing coats will take care of that. 

❏ Stir joint compound well before use. Add clear 

water for desired consistency. 

❏ ProRoc joint compound should never be frozen. 

In cold weather compound should be at room 

temperature 24 hours before using. 

Measure bead and cut to 

right length; a snug fit 

from floor to ceiling 

(about 1/4” shorter than 

the wall height). With a 

7” knife apply a 

generous amount of 

ProRoc joint compound 

on either side of corner. 

Using even pressure, press 

paper / metal bead onto 

corner into position, 

ensuring it is aligned; 

embed it into compound 

by running the knife at 

45° angle. Let dry for 24-hours. Apply a second coat 

with the 7” knife, allowing knife to rest on nose of the 

bead. Let dry for 24-hours and apply a third coat. After 

another 24-hours, sand the corner to a smooth finish. 

FINISHING FASTENERS 

You will want to coat each of the nail or screw heads used 

to fasten your ProRoc boards with ProRoc joint compound. 

After the first coat has dried completely, you will need 

to sand and apply two more coats to the fasteners, 

sanding between each coat. 

Characteristics, properties or performance of materials or systems manufactured by CertainTeed herein described are derived from data obtained under controlled test conditions. CertainTeed makes no warranties, express or 

implied, as to their characteristics, properties or performance under any variations from such conditions in actual construction. CertainTeed assumes no responsibility for the effects of structural movement. 



©01/07 CertainTeed Corporation. Printed in Canada on recycled paper. C March 2007 Form #: L-TP-001-E

LIMITED WARRANTY 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


P.O. Box 860 


©02/09 CertainTeed Corporation. 

CertainTeed 

ProRoc 

BRAND BOARD PRODUCTS 

Limited Warranty 


Consumer: 800-782-8777 

www.certainteed.com 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ASK ABOUT OUR OTHER CERTAINTEED ® PRODUCTS AND SYSTEMS: 

ExTERIOR: Roofing • Siding • WindoWS • fence • Railing • TRiM • decking • foundaTionS • PiPe 

INTERIOR: inSulaTion • gYPSuM • ceilingS

For use in interior applications 

where greater than normal moisture 

resistance is required. 

Commonly known as moisture resistant gypsum 

board, M-R board, or green board, ProRoc ® 

Moisture Resistant Gypsum Board products are 

designed to provide better moisture resistance. 

ProRoc ® Moisture Resistant products are not 

recommended for use in saunas, gang shower 

rooms, swimming pool enclosures, or areas 

continuously exposed to excessive high humidity. 

All ProRoc ® Moisture Resistant products are 

manufactured with a specially formulated moisture 

resistant core encased in water resistant 100% 

recycled paper. This combination provides an 

effective barrier to moisture penetration. The 

product is recognizable by its signature green 

face paper. 

FOR USE IN MOISTURE PRONE 

AREAS 

Ideal for use in kitchens, bathrooms, laundry 

rooms and storage areas where exposure to 

moisture can occur. 

The National Building Code of Canada (NBCC) 

stipulates that a moisture resistant backing must 

be incorporated, as a base to which a (required) 

waterproof finish (ceramic tile, etc.) is adhered. 

In areas where the moisture resistant backing 

is not required, Moisture Resistant products 

can be finished, painted or wallpapered using 

regular gypsum board techniques. 

ProRoc ® Moisture Resistant is available in 

12.7mm (1/2") thickness, as well as in 15.9mm 

(5/8") thickness with Type X core. The gypsum 

core is inherently fire-resistant and non-combustible, 

which means that ProRoc ® Moisture 

Resistant products provide a margin of fire 

protection to any building system. Where fire 


CertainTeed 

Moisture Resistant Gypsum Board 

resistance rating is required, ProRoc ® Moisture 

Resistant Type X product should be specified. 

For further information regarding specified handling, 

storage and application methods, consult the relevant 

CSA and ASTM application standards and the 

Gypsum Association (GA) literature. The Gypsum 

Board Systems Manual contains construction 

details, fire resistance ratings, and STC ratings for 

the full range of building systems. The Gypsum 

Board Systems Manual and MSDS information are 

available on our web site, www.certainteed.com 

PRODUCT DATA 

Data Sheet 

THICKNESS 

12.7mm (1/2") ProRoc ® Moisture Resistant 

15.9mm (5/8") ProRoc ® Moisture Resistant Type X* 

LENGTH 

Contact the nearest Sales Office for stocked lengths 

available. 

WIDTH 

1220mm (4') 


12.7mm (1/2") ProRoc ® Moisture Resistant – 

8.0 kg/m2 (1.65 lb/ft2 ) 

15.9 mm (5/8") ProRoc ® Moisture Resistant Type X – 

11.0 kg/m2 (2.25 lb/ft2 ) 

CORE 

ProRoc ® Moisture Resistant – gypsum 

(non-combustible) with hydrophobic treatment. 

ProRoc ® Moisture Resistant Type X – gypsum 

(noncombustible) with proprietary formula for fire 

resistance performance and hydrophobic treatment. 

EDGE 

Tapered, paper bound – factory finished 

END 





• ASTM C 630 Water-resistant Gypsum Backing Board 













Fire resistance rated assemblies using any ProRoc ® 

Type X products must be constructed in accordance 

with the details as shown in the latest edition of the 

respective laboratory listings. 



LIMITATIONS 

• If used on ceilings, framing should be no greater 

than 300mm (12") o.c. for 12.7mm (1/2") board 

and no greater than 400mm (16") o.c. for 15.9mm 

(5/8") board. 

• ProRoc ® Moisture Resistant is not recommended for 

areas which will be continuously wet or subjected to 

high humidity such as saunas, steam rooms or gang 

showers. 

• Treat all cut edges and openings with water repellent 

sealant. 














P.O. Box 860 



Consumer: 800-782-8777 

www.certainteed.com

For interior wall and ceiling 

applications where a fire resistance 

rating and/or sound transmission 

classification (STC) rating is required. 

ProRoc ® Type X has a specially formulated gypsum 

core containing additives that give this type of gypsum 

board a greater degree of fire resistance than regular 

gypsum board. All ProRoc ® Type X products are 

manufactured with 100% recycled paper which may 

be finished, painted, textured or wallpapered using 

regular gypsum board techniques. 

ProRoc ® Type X products exceed the CSA and ASTM 

requirements for Type X gypsum board. Type X gypsum 

board is referenced throughout the National Building 

Code of Canada (NBCC) as a recommended fire 

resistive building material. 

ProRoc ® Type X boards are required to meet a minimum 

fire resistance rating of 1 hour for a system consisting 

of a single layer of 15.9 mm (5/8") board on either 

side of non-load bearing 3-5/8" steel studs on 600 mm 

(24") on centre, ProRoc ® Type X boards meet this 

requirement. 

PROROC ® TYPE X GYPSUM BOARD 

ProRoc ® Type X boards provide longer fire 

protection than regular gypsum board products. 

Listed by Underwriters’ Laboratories of Canada 

(ULC) and Underwriters Laboratories Inc. (UL), 

and recognized for use in assemblies listed with 

Warnock Hersey/ITS, ProRoc ® Type X economically 

attains fire resistance and STC ratings for a wide 

range of construction requirements. 

For interior environments where greater than 

normal moisture resistance is required and fire 

resistance and/or STC ratings are essential, 

ProRoc ® Type X Moisture Resistant board is 

recommended. 


CertainTeed 

Type X Gypsum Board 

For further information regarding fire resistance 

ratings, STCs, and assembly details for building 

systems, consult the Gypsum Board Systems 

Manual. Generic fire resistance and STC ratings 

for common building systems are referenced in 

Part 9 of the NBCC and provincial codes. The 

Gypsum Association’s (GA) Fire Resistance Design 

Manual, GA 600, contains fire resistance and STC 

ratings for proprietary systems and generic 

assemblies. The Gypsum Board Systems Manual 

and MSDS information are available on our web 

site, www.certainteed.com. 

PRODUCT DATA 

Data Sheet 

THICKNESS 

15.9mm (5/8") ProRoc® Type X 

LENGTH 

Contact the nearest Sales Office for stocked lengths 

available. 

WIDTH 

1220mm (4') 


15.9 mm (5/8") ProRoc ® Type X – 11.0 kg/m2 (2.25 lb/ft2 ) 

CORE 

Type X – Gypsum (noncombustible) with proprietary 

formulation for fire resistance performance. 

EDGE 

Tapered or square edge, paper bound – factory finished 

END 





• ASTM C 36 Gypsum Wallboard 













Fire resistance rated assemblies using any ProRoc ® 

Type X products must be constructed in accordance 

with the details as shown in the latest edition of the 

respective laboratory listings. 



LIMITATIONS 

• Maximum framing spacing as per the National 

Building Code of Canada (NBCC), recommended 

application standards and design listings. 














P.O. Box 860 



Consumer: 800-782-8777 

www.certainteed.com

Regular Gypsum Board

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