---
title: "Type X Drywall"
description: "Type X drywall installation in Orange County. The 5/8 inch fire rated board used in most one hour assemblies, installed to listed details."
url: "https://hanenburg-drywall.vercel.app/services/specialty-drywall-systems/type-x-drywall"
section: "Services"
business: "Hanenburg Drywall"
location: "Irvine, California"
updated: "2026-09-25"
---

# Type X Drywall

Type X is 5/8 inch gypsum board with glass fibre reinforcement in its core that helps it stay intact longer when exposed to fire. It is the board used in most one hour rated assemblies, though the rating comes from the assembly rather than from the board.

Type X board contains glass fibres distributed through its gypsum core. Under fire exposure, gypsum releases the water chemically bound within it, which absorbs heat, and the glass fibres hold the weakened core together while that happens. That combination is what buys the rated time.

Type C goes further, with additional additives and more glass fibre, and it appears in assemblies requiring longer ratings or particular performance. Both are components of tested assemblies rather than ratings in their own right.

## Why this matters

- Correct board for most one hour rated assemblies
- Installed at the fastener spacing the listing specifies
- Also useful for ceilings generally, given its sag resistance
- Type C specified where the assembly requires it

## Our Process

1. **Define the Performance Target**: Moisture, fire, sound, and impact are four different problems. We establish which one you are actually solving before specifying anything.
2. **Specify the Assembly**: Performance comes from the complete assembly, not the board alone. We specify board, framing, insulation, fasteners, and sealing together.
3. **Written Scope**: The estimate names the specific board type and assembly details, so what you are buying is unambiguous.
4. **Build to the Detail**: Specialty assemblies only perform when built exactly as listed. We follow the detail rather than approximating it.
5. **Verify and Document**: Assembly checked before close in, documented where an inspection or rating depends on it, then finished and cleaned.

## What's Included

- Assembly listing confirmation
- Type X or Type C board installation
- Correct layering and joint staggering
- Fastener type and spacing per listing
- Joint treatment and firestopping coordination

## Frequently Asked Questions

### What is the difference between Type X and Type C?

Both are fire rated boards with reinforced cores. Type C contains more glass fibre and additives that reduce shrinkage under fire exposure, so it performs better and appears in assemblies requiring longer ratings. Type X covers most one hour assemblies. The listing for your specific assembly determines which one is required.


---

**Hanenburg Drywall**
12 Elksford Ave, Irvine, CA 92604
Phone: (949) 446-1300
Email: info@hanenburgdrywall.com
Hours: Mon to Fri, 8:00am to 4:00pm

Serving all of Orange County with no travel surcharge.
Request a free written estimate: https://hanenburg-drywall.vercel.app/contact/request-estimate

*Last updated: 2026-09-25*