2026 Board Guide • Family-Owned Since 1970 • CSLB #265709
5/8″ vs 1/2″ Drywall Thickness
Thickness is how thick the panel is. Type X is what is in the core. Mixing those two up is how a garage wall fails inspection and a closet gets oversold.
The Short Answer
Most interior walls: 1/2-inch. Most ceilings, especially 24-inch framing: 5/8-inch. Garage-to-house and other rated walls: the listed Type X assembly — usually 5/8-inch Type X, not leftover wallboard.
Ron Hogan Drywall has been family-owned since 1970. We hang the board the room and the drawings require. We do not upsell 5/8-inch into a closet.
Thickness Is Not Type X
1/2-inch and 5/8-inch are measurements. Type X, moisture-resistant, QuietRock, and DensGlass are products. A 5/8-inch panel is not Type X unless the stamp says Type X.
If the plan calls for a fire-rated assembly, follow the listing. Guessing “thicker is safer” is how jobs get torn off. Types comparison →
Where Each Board Goes
1/2-inch — most walls
Living rooms, bedrooms, hallways, and closets on typical 16-inch studs. Lighter, cheaper, easier to hang. The default interior wallboard.
5/8-inch — ceilings and stiffness
Less sag between joists. Use it on ceilings with 24-inch spacing, and often on 16-inch ceilings if you want a flatter plane. Heavier. Two people on a sheet is not optional.
5/8-inch Type X — rated work
Garage-to-house walls, garage ceilings under living space, corridors, and other listed assemblies. The stamp and the drawing decide — not a blog. Type X →
Not a sound product
Thicker board adds a little mass. It is not QuietRock and it is not a listed sound wall by itself. QuietRock →
1/2″ vs 5/8″ Side by Side
| Question | 1/2-inch | 5/8-inch |
|---|---|---|
| Best default | Interior walls, 16″ studs | Ceilings; many fire-rated walls |
| Sag on ceilings | Fine on 16″ joists if the product allows it; weak on 24″, worse under heavy texture | Stiffer. The usual ceiling call on 24″ framing |
| Fire rating | Regular 1/2-inch is not a garage-separation panel | Only Type X (or the listed product) counts in a rated assembly |
| Weight / hang | Lighter. Faster on walls | Heavier. Plan extra hands on ceilings |
| Cost | Lower material and labor | More per sheet and more labor. Worth it where sag or code requires it |
| Finish | Same taping, texture, or Level 4 / 5. Thickness does not replace a finish spec. Level 4 & 5 | |
Ceilings: This Is Where 1/2-Inch Shows
16-inch joists
1/2-inch can work when the manufacturer allows that span and you are not loading the board with a heavy water-based texture. 5/8-inch still hangs flatter.
24-inch joists
Use 5/8-inch, or a listed 1/2-inch sag-resistant ceiling board installed the way the table requires. Regular wallboard on 24-inch ceilings is how you get waves after the first winter.
Texture and insulation
Water-based texture and insulation above a ceiling add weight and moisture. That is when a “good enough” 1/2-inch sheet starts to belly. How we hang →
Garages and Rated Walls
The wall between an attached garage and the house is not “whatever is left on the truck.” In most Bay Area jobs the garage side of that separation — and the garage ceiling under a room — is 5/8-inch Type X or another listed assembly. Regular 1/2-inch does not become Type X because you doubled it.
House side vs garage side
The rating is in the listed assembly. Read the drawing. Do not invent a sandwich of leftover 1/2-inch and call it code. Garage board →
Living space above the garage
The garage ceiling usually has to be the fire-rated panel, fastened on the schedule the listing requires. This is the detail homeowners miss.
Other garage walls
Exterior and partition walls in a dry garage are a different question from the house separation. Finish only if the space is dry. Should you drywall the garage? →
Not on This List
5/8-inch does not make a house earthquake-proof. It does not replace QuietRock. It does not lower your insurance by itself. And “5/8 Type X on every exterior wall for wildfire” is not a product we invent on a blog. If the AHJ or the drawings specify an assembly, we hang that assembly.
Quick Picker
Bedroom / hall wall
1/2-inch regular unless the plan says otherwise.
Ceiling
Usually 5/8-inch. Always ask before hanging 1/2-inch on 24-inch joists.
Garage to house
Type X as specified — typically 5/8-inch Type X on the garage side.
Shared wall / office
Thickness will not quiet the room. Use the listed sound assembly or QuietRock.
Want the Right Board Hung?
1. Send the Room
Text (925) 791-9099 the city, photos, and any drawings.
2. We Call Thickness and Type
Wall vs ceiling, span, and whether Type X is actually required.
3. We Hang and Finish
Licensed crews. 12-month warranty on our work.
Thickness FAQs
Is 5/8-inch drywall always better than 1/2-inch?
No. It is stiffer and often right for ceilings. On a standard bedroom wall it is extra weight and extra money with no code reason.
Is 5/8-inch the same as Type X?
No. Type X is a fire-resistive core, usually sold in 5/8-inch. Read the stamp. Regular 5/8-inch is not a rated garage panel.
What thickness drywall for ceilings?
5/8-inch is the usual call, especially on 24-inch joists or under texture. 1/2-inch on a wide ceiling is how sag shows after paint.
What thickness for garage drywall?
The separation to the house is typically 5/8-inch Type X or the assembly on the drawing. Other garage walls are a separate decision — and only if the garage is dry.
Can two layers of 1/2-inch replace Type X?
Not by default. A fire rating belongs to a listed assembly. Stacking regular 1/2-inch is not the same as hanging Type X where the listing calls for Type X.
Does thicker drywall soundproof a room?
A little mass helps a little. If noise is the job, specify QuietRock or the sound assembly on the drawings — not “just hang 5/8.”
Does thickness change the finish?
No. You can tape, texture, or skim Level 4 / Level 5 on either panel. Finish is a different spec from board thickness.
Hang the Board the Room Needs
Call the family-owned Bay Area crew that has been hanging and finishing walls since 1970.
Call / Text (925) 791-9099