Drywall Buying Guide
Drywall Buying Guide
Choosing the right drywall is not just about thickness. Fire rating, moisture resistance, and panel size all affect your timeline, your budget, and your final inspection. This guide breaks down what you actually need to know before you order.
Panel Types Explained
| Type | Thickness | Best For | Code Note |
|---|---|---|---|
| Standard | 1/2 inch | Interior walls, ceilings | ASTM C1396 |
| Green Board | 1/2 inch | Bathrooms, kitchens, basements | Moisture-resistant face |
| Type X Fire-Rated | 5/8 inch | Commercial, shared walls, garages | 1-hour rating per ASTM E119 |
Green board is NOT cement board. For shower surrounds and tub enclosures, always use cement backer board. Green board handles humidity, not direct water contact.
How to Calculate Quantity
Measure total square footage of walls and ceilings. Divide by 32 for 4x8 sheets or by 48 for 4x12 sheets. Add 10 percent for waste and cuts. For complex layouts with many windows and doors, add 15 percent.
Joint Compound and Tape
All-purpose compound works for both embedding tape and finishing coats. For large commercial jobs, consider separate taping and topping compounds. Fiberglass mesh tape is self-adhesive and faster to apply than paper tape, but paper tape is stronger for inside corners.
What You Will Need per 100 Sheets
- Approximately 350 lbs of all-purpose joint compound
- One 300-foot roll of fiberglass mesh tape
- 5 lbs of coarse-thread drywall screws (#6 x 1-1/4 inch)
Delivery and Handling
4x12 sheets save labor on large walls but require a two-person carry and a larger vehicle. If your job site has tight access, 4x8 sheets are easier to maneuver. Western Works delivers both sizes direct to your site with same-day availability across California.